Just a plain silicon photodiode alone would probably be more sensitive than this contraption... A student of mine built a quite capable gamma spectrometer this way.
If a safety device for any other field had the same rating, it would not be allowed on the market. Yet it sales for an outrageous amount of money because most of the public is usually not familiar with the mystery of radiation and greed rushes in to fill in the gap. Great work my friend! Keep up the good work !
Very detailed video, I was always interested in what was in it, but it was too expensive to look it up myself :) And it's great that you only used the usual voice again. ^^
Yes, the voice, that's a whole thing... Damned if you do, damned if you don't. Myself and Max (yes, it really is another person), are actually thinking a bit about how to make it a bit more of a double-act, there are quite a lot of interesting options and interplay for doing that in our 'idea tank'. Let's see how things work out.
Its not a shitty product, its a deadly product. Creators of this should be jailed for claiming it detects nuclear fallout, this WILL kill someone someday without even understanding what happened as the user will never find out he was being irradiated while feeling completely safe. maybe it already happened, who knows..
Making this video has given an impression that the world actually needs something like the NukAlert, but one that works for real and delivers some useful data. Perhaps we will develop one ourselves...
@project-326 something aimed at the Prep's market sounds like a great idea. IMO, it needs to be practical, affordable, and most importantly - to legitimately work!
@@Nachos-sk7od This is correct for alphas and betas. For gammas, the cross-section is too small to be sensitive enough. A scintillator is much more efficient.
I agree. I wanted to keep the cost of the system under $10, but the cheapest scintillator I could get is a recycled CsI crystal from a medical X-ray machine, for $6 each (4*4*3mm). I'll test it to see if it improves gamma sensitivity:)
As someone who saw an ad for that thing, I almost got duped and spent the money. Though I came here toatally biased. Thank you for an outstanding video and review!!!!!
The Radiacode devices are pretty impressive... Sensitivity and accuracy are not quite the same thing with detectors. Any device can be accurate, its just a case of having a calibration factor that relates count events to units like Sieverts. Sensitivity is quite lot more important and also difficult to achieve than basic 'accuracy'.
I do not know about the rest of the world, but in Russia the Internet is littered with ads for the sale of old Soviet radiation measuring devices. Army devices can be purchased from $ 10 ($10 for a workable device!). A normal household appliance will cost from $ 30.
eBay has a lot of this stuff too, but not as low cost as you describe. The detectors that military personnel were issued had a very different purpose to what the general population needs. They were designed to assist military gauge the 'correct' time to come out of cover and attack the opposing lines. Too early and your guys will have a very short time to live, too late and perhaps the enemy has already overrun your lines. They were not designed to keep people safe, they were designed for front-line troops to win a battle so that reserves can then later come forward and repeat the process.
Thanks so much for another interesting and humourous video. In my opinion Posh Arthur is all this channel needs so Max can take a well deserved rest if he feels he has other things that are more important. As a result of your reviews I have bought a Little Garden Spectrometer...arrived very quickly in New Zealand as did a Bosean Detector. Both great and fascinating products. I just wish the Bosean light flashed together with the clicks as my other one does, an Aware Electronics RM-60 and LCD-90Pro logger, but that is a small omission for the price. Keep up the good work for us all!
I'm glad that you managed to find a couple of bargain products that actually work, its a feeling that we all enjoy, finding low cost gems... From my perspective, having bought so much dross, I'm just pleased that the Bosean actually has clicks!
Thank you very much, this little channel appreciates all the help it can get! Perhaps you can give help me with deciding what the next video should be, I have some options: 1) Part #3 of the 'UV Vs GM' video, I have more than 10 videos from other people that can be woven into the final part of that subject. 2) Testing, teardown and analysis of a laser power meter that I recently acquired. 3) Some beta particle experiments that we have done, including using magnets to deflect them. 4) The Faraday effect, how we built that experiments and the results. Your feedback would be greatly appreciated.
Our approach to product reviews means that in almost all cases, we need to go out and buy products to test which get expensive. Most manufacturers won't send us a sample of their equipment to test, they are usually just too scarred to do so, or don't have enough confidence in their products.
If it is that bad, I need one of the other dosimeters. Because I bought one over 20 years ago, I have had to put it in a drawer because my window is under the house waves and it would click so loudly after it rained in 2011 post 3/11 I had to put it in a drawer. The only time it actually made an alarm was riding with my brother on the interstate when he was trying to pass a white unmarked tractor trailer, and I pulled it out of my pocket and showed him, convinced him to slow down and exit to travel on another highway to get away from that truck. Other people carrying a Geiger counter because of 3/11 were having similar experiments on interstates encountering white unmarked tractor trailers. Apparently thefind it safer to move hot loads with no marking or fanfare ?
Thanks for sharing your story. The stray gamma radiation from nukes being transported certainly would not set the NukAlert off. I have read a lot of reviews that talk about it being triggered by sunlight, power lines, etc. In a nuclear warhead, there are only three types of radioactive materials, Pu-239, U-235 and in older devices, H-3. The first 2 are alpha emitters and tritium is a beta emitter. Without expensive specialist detectors you would have trouble detecting any of those, even at short range (weapons grade material is very pure and so there won't be anything much in the way of decay products that are more detectable). Natural uranium ore is very detectable with low cost equipment (but not with the NukAlert) because it is billions of years old and has a lot of decay products contained in it. Look on the bright side, I spent a lot more to test this PoS that you did 20 years ago when you bought it, which makes me the sucker! In addition to buying it, I needed to pay for shipping to China, importation duty, the x-ray source, when when added up comes to about $450... In fairness, due to its small size, its a great addition to a "hall of shame". Its got a cool form factor and a great sales story behind it. The exact properties that we all should be cautious of when buying new things.
As an alternative i can suggest the Atom Swift. Its a tiny scintillator device that can be used as a keychain, it's mostly used with the mobile phone application that extends its capabilities alot, but even without the app its still very great and sensitive alarm device
Seems like a good device, but if I buy any more gamma ray spectrometers, I'm going to go bankrupt! I'm am going to be doing a review of the Radtus R103 soon though, it is more of a direct equivalent in terms of size and use-case.
14:21 I thought you were going to smash it with a hammer xD It only detects fluorescence with a photoresistor, so it needs extreme amount of radiation to work. A total scam. lol I like the robotic voice
lol it just clicks rhythmically like a metronome. Let alone the fact that it just pretends to work, how dumb must the developer be to not use at least some form of entropy to fake it
What happens if you leave the source on the detector for a longer? Period does it pick it up? It might require more time to react with simple electronics.
Very interesting! I thought that this device was legit because BNC was selling it, glad I watched the video. Not that I would have gotten one anyways since I have more suitable equipment, but still.
Where in hell did you found a 2n4117? All FETs I bought were bipolar transistors rebranded as FETs, meaning fake ones. The only ones I found were SMD from Interfet and the old ones I have in my junk box.
Thanks for the comment. I have seen dodgy little resellers (usually they operate out of sheds in the countryside and keep moving around to avoid getting busted) re-marking cheaper components for more expensive ones, but for cheap transistors, that's pretty slim pickings. These days, those little fake component vendors are dying out - they would have completely died out if it wasn't for the Ukraine war. I heard that these remarking shops are now busy selling fake MCUs to Russia. Maybe its a coincidence, but the VKD has lost quite a few war-planes recently due to 'technical faults'. I know quite a bit about these re-marking operations. My wife comes from the same rural part of Guangdong province where this is (or was) quite prevalent. I also work with a lot of factories here and they tell me a lot of stories about this and how they avoid getting screwed on component supply. I got these JFETs on TaoBao. China has a lot of discrete semi manufacturing, though its aimed at the internal market. I have found all kinds of things here that seem to have died out in the west, diac triggers, uni-junction transistors, etc. A funny story about the uni-junction transistors, a friend of mine in the UK was looking for some as part of a relaxation oscillator, but in the end, it was just a bit cheaper to get a Chinese 8 pin MCU (8051 clone) and create the same signal via PWM (a 13 cent MCU)... Mind you, the 4117 isn't particularly special, most n-ch JFETs will work in this application. There is no HF gain requirements, the Vgs is fairly typical. Perhaps the ones I got are a different type, but they are certainly JFETs, and for this near-DC application, it probably doesn't matter. I think I paid 7 cents each for them (for a strip of 10 pieces).
@@project-326 I really don't know why FETs died out. Some say they were not trustable. But they are more resistant to static, to radiation and much lower thermal noise than MOSFETS. Certainly there are applications where they are preferred (hearing aid devices are one of those, maybe that is because I can only find them in SMD form). UJTs I can still find easily here.
Great video as always. Thanks for sharing! For such a price, I thought they'd use SBM-21 for the sensor to achieve the small size and sensitivity. Then a minute down the test part, I'm totally angry about how terrible it is. In comparison, the ionization chamber without special treated gas but filled with merely air works better than I expected!🤯
I was really surprised with how it worked detecting x-rays. It could detect a decent alpha source like Am-241 but was useless with my other sources. With the x-rays it was just amazing!
Always satisfied 😀 my curiosity with your comprehensive video..........please do a video on construction of the ionisation detector shown here ..... will be a fun weekend DIY project for viewers !!!!
perhaps, but there are already a lot of videos on this type of thing on RUclips. We do prefer to have unique content, that said, even when we have the ONLY video on something we came up with, it doesn't seem to get a lot of views. The beta backscattering video and the IR chroma keying camera video both did poorly on RUclips, both of which are totally unique.
Great review, I made more sophisticated electronic devices when I was in high school (late 1980s) with parts I bought at Radio Shack. Definitely a scam, IMO. At least 10x overpriced and overhyped.
it might be off by a little bit from the contents you make on your channel, but could you please review the "ANENG 681 multimeter"? I would like to hear your opinions about it
The cheapest detector i have is a "Hakarucchi ipt'a" which i got for less than 30$ shipped in 2014. The "RAT-1W" is the same probably with other look. These where sold after fukushima. They are no longer available, take 3 AAA batteries and have a single button and simple display. They can display average radiation of the last 1-6min (0.1ySv/h - 19.9ySv/h) and lifetime dosage. Mine remembers the lifetime value without batteries since many years. Also shows around 0.1 for background and 2.3 for a old camera lense with thorium, next to it after a few minutes. Considering the inflation since 2014 and that this included shipping, thats quite cheap. Mine has a blue label with a picture of playing children and butterflies on it. I think these where made in japan without any intend to make a profit but rather help people after fukushima. Iam not 100% sure what detector it uses but i think its some semiconductor detector.
The huge markup is not as infuriating as the fact that this is just a crude X-ray detector and nothing else. Big thanks for exposing this piece of garbage.
@project-326 they used every trick in the book to ensure that sense of security. I'm surprised that FCC and CE have not caught up with this scam. Hopefully, your work will raise some alarm bells.
@@duke_of_oz Normally the FCC and CE won't intervene, they don't want to use the resources. Well, unless it is a Chinese product, in which case there will be customs seizures and a "SWAT team" type response... The Gamma Scout doesn't have FCC certification either and that has been available in the USA for decades.
Yup. The gadox has zero response to anything north of about 200keV, no response to alpha or gamma. Using a CdS cell is making a bad product even worse.😢
@project-326 since you already have it try replacing the CdS cell with a J fet and photodiode. Then put a LYSO crystal in it. Should make it a lot more sensitive, at least able to respond to the Sr90 and 137Cs check disk.
17:50 min: An addition to your statement that gadolinium oxysulfide is 3000 times less sensitive to Cs-137 than to X-rays and has a shockingly low sensitivity to gamma radiation. If you read the patent US6897448, the sensor consists of 4 components: a transparent cone, 2 layers of phosphor and on top (outside) a high-density metal coating. The author recommends lead. It could therefore be that the sensor is surrounded by a thin lead foil and only the bremsstrahlung generated in it reaches the phosphor and interacts with it. It is then also sensitive to this. That would explain why your first X-ray tube had no effect; the lead completely shielded the low-energy radiation. It could therefore be that the sensor is more sensitive to radiation that generates a lot of bremsstrahlung.
The product data sheet also states that the newer versions don't have the lead foil added. Besides, photons don't generate bremstrahlung, only particles (ie things with mass) can do that. The other point is that bremstrahlung is a very small effect compared to the original flux of beta's or other particles that give rise to it, ie the efficiency is very low. A typical x-ray tube, which is about as an efficient bremstrahlung source as it is possible to create (ie vacuum, high density target, etc) has a typical energy efficiency less than 1%. For incidental bremstrahlung, you can expect the efficiency to be somewhere between 0.1 and 0.001%. I hope that helps.
The GammaScout most likely has a gas tube in it while the others have a scintillator crystal. Under high flux the tube don't work properly as a continiously conductive path exists and it stops counting. Not good but expected behavior.
Actually, in the testing section, the BR6, HFS-10, HTT-60 and FS-5000 are also GM tube devices. Typically with a GM tube, once the count rate gets too high, the dead-time limits the count rate to a pretty fixed maximum. To become continuously conducting, the tube voltage needs to be increased, taking outside of the Geiger plateau region and into the continuous discharge region. We have a separate review video on the Gamma Scout, it is a device that we have a long history with and features in many of the review videos...
@@faxezu Whilst this is a sort of educational channel, we try to have fun too. The Gamma Scout is just a badly designed device, the company that makes it, has a real dislike of this channel, every now and then one of their people shows up in the comments on a hate-fest. We have pretty much figured out who their small team in Germany are now and what Google accounts they use. Will probably have to go through the process again with the people behind this horrid NukAlert... It strange, there are a lot of videos featuring it, but only with a view to selling it. Well, there is a full review on the product now! 🙂
@@project-326 I might be German, but I swear to have no affiliations to GammaScout 😄 Thanks for the nice video and sorry again if my first comment sounded negative!
Hello, can you, please, do a review for the HFS-P3 Pocket Pen Type Nuclear Radiation Detector if it is a piece of 💩 or in some cases it can be useful. Thanks.
great check, I have toght it use diode semiconductor and sense over beta. It would make sense for a cheap device, but it is actually not cheap at all. As the mica window at my inspector Geiger mueller pancake tube has broken and never found a cause, maybe due to the travel over mountain and air pressure change or even manufacturing defect. Besides the replacement from the LND the decision was also to get one rugged LND 71210 for the safety situation. In the case of explosion the blast pressure may destroy mica and make it useless, so the cylindric tube that use more rugged window may be more reliable. It is also energy compensated so may be used for better measurement of some sources. For the same reason it was expected that nuke alert use diode rather then mica. Tested and LND 71210 performs quite fine on the same GM made for their pancake tube, just the calibration is different. Sensitivity of ion chambers is lower then GM, but they have great linearity so they are good for measurement.
Thanks for the feedback. Those kinds of alpha capable GM tubes are very fragile... The proportional region of the curve is certainly much better for linearity and can even be used for spectroscopy, etc but has really terrible detection sensitivity... We are actually considering creating a DIY device that is small like the NukAlert but actually works...
@@project-326 scintillators may be fine solution, but they are expensive, so diode appears as an acceptable solution for high contamination. But the main purpose of such detector is when to get out of the shelter and where to move, as the initial blast does not need detector.
I am surprised that this has good reviews on Amazon. Just shows these people don't test their products or it is just another case of Amazon pushing scams.
How would anyone know if it works or not, unless they can convince a friendly dentist or doctor to help them... I saw loads of reviews that said it went off in situation X or Y but I think those are related to sunlight getting into the unit.
The PIC12F5xx series are the absolute cheapest of PIC chips. They are great for small simple jobs and I've used them for many projects because they cost $0.60 each. The CDS cell is also the cheapest possible sensor and even a simple photodiode alone would probably do a better job. I'd even wager that a 1N914 signal diode might be more sensitive and cost less. I'd love to download the firmware of the chip and disassemble it for shits and giggles. I suspect it will grossly under utilize the capabilities of these PIC chips
@davehimlin2374 There is no need for such functionality as the environment radiates enough particles for a detector to tick, and thus let itself known to the user that it is on.
I didn't hear that fucking big bang, didn't see the blinding flash or massive mushroom cloud nor feel the heat or shock wave. Lucky my keyring is bleeping or I would never have know about that fucking great big bomb!
They have indeed been in business for 2 decades, and frankly they have been scamming people for so long that I needed to make a video to show why it actually is useless for its intended purpose. It's just an x-ray detector...
Doesn't seem like a true scam. At least the design technically functions as a radiation detector. I'm sure there was a much better design someone made but the accounting department demanded that they cheapify it.
The creator of the NukAlert was a one man team, I believe he took on some staff and uses sales agents, but that isn't the same thing as internal company pressure. I get the feeling that this was the only design he created, the company only has one product and has been selling the hell out of it for over 20 years. You are right, it functions just enough to avoid a class action. Thanks for the feedback!
The nukalert works well for it's intended purpose. It was designed to detect rads per hour, not milirads. The nukalert WILL alert you to high levels of radiation, it's not going to work for your grandma's trip to the antique shop hunting uranium glass. 😂
"The nukalert works well for it's intended purpose" I'm curious now, how do you know that it does? Other that the tests that we ran, there is only one video anywhere of it doing anything (please do let us know if you find any others), and its that one using a dental x-ray machine. Anyway, I'm pleased that you did actually get an FS-5000, it's a great product and well built (for the price) and you won't have to take anyone's word for it that it works, you can test that device yourself.
@@project-326 I'm a noob in this so help me out. If a nuclear power plant blew up 150 miles away from me and fallout was blown over my house you're saying that they nukalert wouldn't detect that? Would the FS-5000 pick it up? Because I just bought that based off your other video 😆
@@TaylorHaubrich The FS-5K can pick up the background radiation level, so you can be sure it will indicate levels above normal background. You can even take it down to you local home depot and put it next to some ionization smoke alarms, you should be able to pick up the feint gamma emissions from the Am241 source inside the package. Hope that helps...
@@project-326 yes I ordered one from the AliExpress link in your video description. my only concern is if my fallout shelter is doing its job then I shouldn't pick up any reading on the FS-5000. How do I know there's fallout without taking my geiger outside? 😆
The original Russian one was decent. It dis more or less the same thing and the battery could be changed. A 10uCi check disk would get it to beep and was loud enough to easily hear it. It was only for detecting dangerous levels of radioactivity and also was only 25 bucks😂 180 bucks could get a decent geiger counter.
I appreciate you took it apart and told us about its design, however, I disagree with many points in the video. Why not buy a cheap Geiger counter instead? Well, because under nuclear attack it would be useless, it can behave as Gamma Scout did or show zero. Even if it didn't, what is it good for when it tells you you have gone beyond 10mR/h? Surface bursts create fallout plumes where radiation field reaches hundreds of R/h. I'm talking about gamma only, during the "acute phase" it doesn't make much sense to care about beta other than keeping fallout particles away from your skin and preveting their inhalation when fallout descends, there are almost no dosimeters that show you beta dose rate (all those who "measure" beta with their Geiger counters and gamma scintillators do it wrong). Cheap Geiger counters are often gamma non-compensated and not even beta shielded, so they show nonsense values in mixed radiation field, another reason why relying on them only is a bad idea. Geiger counter with range up to 10-100mR/h may be useful inside a fallout shelter. By the way, deposited radioactive fallout is a plane source, removing some contamination from the shelter won't save you from radiation sickness, it's proper shielding that does. Civil defense protective measures were designed to prevent people from suffering acute effects of radiation exposure such as radiation burns and sickness, those short lived isotopes which you mentioned as not important are actually those that matter the most, during the first day or two their gamma radiation delivers the greatest portion of the total dose. As they decay fast, they have very high specific activity. Cs-137 won't be an acute hazard. When it becomes the major contributor to gamma dose rate (about 4 years after the explosion), there will be no areas of immediate danger, maybe except the very epicentres of surface bursts. By that time Nukalert may be almost useless. Of course it doesn't mean you can't use Cs-137 for the purpose of Nukalert validation, you just have to use a source strong enough to create that R/h range gamma field. In my opinion telling people that Nukalert is useless and that they should buy a low range Geiger counter is dangerous. If the Nukalert scintillator responds mainly to X-rays, there is a remedy for that - energy compensation and the patent mentions that. Not only the layer of lead attenuates low energy radiation (preventing falsely high readings), when high energy photons come, they liberate electrons leading to stronger response. X-ray testing you have shown may be good to test if it can respond to radiation but without further data (spectrum of the X-ray source, energy characteristics of the detector - after compensation!) and calculations it can't be used for indicated value verification.
I wonder what caused it to chirp such a long time after the X-ray burst, maybe the burst was so intense that it damaged the detector and/or the electronics.
That's the way is it 'supposed' to work, according to the patent and the product documentation. The MCU flashes the LED to [allegedly] make the phospher more sensitive, which triggers the LDR, which in turn causes the MCU to flash the LED. They do this to make it have some sensitivity. So, this ends up with a system that has a crazy long time constant when triggered.
Thank you for the long and well thought out comment. One thing I learned, when talking to people in the prepper movement, is that everyone seems to have a slightly different view on what a nuclear exchange would look like. Expectations vary from "the government will be back up and running in a month or so" to "back to the stone age", and this has a lot of effect on the use case. I fully agree, short half-life products are more dangerous, far more so, but if you are going to stay holed up in a 'bunker' (ie use case is important) for a month or more, then actually it is the medium term fission products that will become more relevant to long term survival. In any cases, the simple fact that the NukAlert is almost totally insensitive to gamma above 100 KeV, means that even very high dose rate fall out will not be detected by this thing. The Gd2O2S scintillation material has almost no sensitivity at the important gamma energy levels. The manufacturer is well aware of the failings of this device, what is important to them is sales, not functionality. What I would caution over is comparing devices intended for civilian use and those that were created for military use. Cold war military doctrine, on both sides was not something that produced equipment that would be helpful to civilians. In the cold war, the expectation was that soldiers would take cover in preassigned locations. The side that sent its soldiers out at the "right" time would win the battle. Come out too early and the soldiers will be incapacitated very quickly, come out too late and the enemy has already over run your positions. These types of calculations were not factoring in long term health of the soldiers...
Don't worry, the GS has more features, so has many more ways to disappoint us. It's pretty hard to poke fun at something with the functionality of a paperweight.
@@project-326 I agree...I think it would be nice for families with kids to watch this channel together. It could be very educational for interested science minded children.
@@alastairbrickell8813 We are considering starting a new channel, just for experiments for kids, but a little less patronizing and dumbed down as the other 'kids science channels'.
I haven't tested it but I saw another review and it seems this device is using pretty horrible HH71x tube. Basically they have taken all the cheap options from the GC-01 and rolled it into an even crappier product.
![I.N "HALLUCINATION" | [Stray Kids : SKZ-PLAYER]](http://i.ytimg.com/vi/n5B5q1Hwt_U/mqdefault.jpg)
It is perfect for finding your keys! just blast the room with X-rays and go to the chirp! This channel is so cool. Thanks for what you do!
LOL, I wish I had thought of that gag in the video! Keep the gags coming!
Just a plain silicon photodiode alone would probably be more sensitive than this contraption... A student of mine built a quite capable gamma spectrometer this way.
Great video as always.
Very interesting to learn about this device and exposing its non functionality!
Glad you liked it!
The end of the spectrum that is called cheap and nasty. I just love it when he talks technical. Great video, thanks.
If a safety device for any other field had the same rating, it would not be allowed on the market. Yet it sales for an outrageous amount of money because most of the public is usually not familiar with the mystery of radiation and greed rushes in to fill in the gap. Great work my friend! Keep up the good work !
This has quickly become my favorite channel. Thank you for another great video!
very kind of you to say that, Posh Arthur will be very happy!
Very detailed video, I was always interested in what was in it, but it was too expensive to look it up myself :)
And it's great that you only used the usual voice again. ^^
Yes, the voice, that's a whole thing...
Damned if you do, damned if you don't. Myself and Max (yes, it really is another person), are actually thinking a bit about how to make it a bit more of a double-act, there are quite a lot of interesting options and interplay for doing that in our 'idea tank'.
Let's see how things work out.
and the answer to what is in it, is basically sweet-FA...
Where did the name Paul Smith come from? I know a lot about this thing and the story isn't totally lining up.
Thanks for the "dose" of reality. $180 is pretty expensive for a key fob.
Its not a shitty product, its a deadly product. Creators of this should be jailed for claiming it detects nuclear fallout, this WILL kill someone someday without even understanding what happened as the user will never find out he was being irradiated while feeling completely safe. maybe it already happened, who knows..
Agree with you. Definitely scam.
Even a 1x1 cm² 5 mm thick plastic scintillator with a silicon photodiode would be better.
Making this video has given an impression that the world actually needs something like the NukAlert, but one that works for real and delivers some useful data.
Perhaps we will develop one ourselves...
@project-326 something aimed at the Prep's market sounds like a great idea. IMO, it needs to be practical, affordable, and most importantly - to legitimately work!
Even without a scintillator, a PIN diode works better.😇
@@Nachos-sk7od This is correct for alphas and betas. For gammas, the cross-section is too small to be sensitive enough. A scintillator is much more efficient.
I agree. I wanted to keep the cost of the system under $10, but the cheapest scintillator I could get is a recycled CsI crystal from a medical X-ray machine, for $6 each (4*4*3mm). I'll test it to see if it improves gamma sensitivity:)
As someone who saw an ad for that thing, I almost got duped and spent the money. Though I came here toatally biased. Thank you for an outstanding video and review!!!!!
Thank you for your effort making videos that show scam in radiation detectors. I like your narratation style. Greetings from Germany 👍
Thank you for your feedback, and greetings from China!
The "clicks" also sound at the same intervals. Even if I didn't know anything about this piece of crap, I'd think, "That's pretty suspicious."
7:16 The Radiacode device is most sensitive (accurate) on the bottom....
The Radiacode devices are pretty impressive...
Sensitivity and accuracy are not quite the same thing with detectors. Any device can be accurate, its just a case of having a calibration factor that relates count events to units like Sieverts. Sensitivity is quite lot more important and also difficult to achieve than basic 'accuracy'.
I do not know about the rest of the world, but in Russia the Internet is littered with ads for the sale of old Soviet radiation measuring devices. Army devices can be purchased from $ 10 ($10 for a workable device!). A normal household appliance will cost from $ 30.
eBay has a lot of this stuff too, but not as low cost as you describe.
The detectors that military personnel were issued had a very different purpose to what the general population needs. They were designed to assist military gauge the 'correct' time to come out of cover and attack the opposing lines. Too early and your guys will have a very short time to live, too late and perhaps the enemy has already overrun your lines. They were not designed to keep people safe, they were designed for front-line troops to win a battle so that reserves can then later come forward and repeat the process.
I love the commentary and sarcasm. It's hilarious.
Thanks so much for another interesting and humourous video. In my opinion Posh Arthur is all this channel needs so Max can take a well deserved rest if he feels he has other things that are more important.
As a result of your reviews I have bought a Little Garden Spectrometer...arrived very quickly in New Zealand as did a Bosean Detector. Both great and fascinating products. I just wish the Bosean light flashed together with the clicks as my other one does, an Aware Electronics RM-60 and LCD-90Pro logger, but that is a small omission for the price.
Keep up the good work for us all!
I'm glad that you managed to find a couple of bargain products that actually work, its a feeling that we all enjoy, finding low cost gems...
From my perspective, having bought so much dross, I'm just pleased that the Bosean actually has clicks!
@@project-326 Yes, it's great to have even just the clicks.
Thanks!
Thank you very much, this little channel appreciates all the help it can get!
Perhaps you can give help me with deciding what the next video should be, I have some options:
1) Part #3 of the 'UV Vs GM' video, I have more than 10 videos from other people that can be woven into the final part of that subject.
2) Testing, teardown and analysis of a laser power meter that I recently acquired.
3) Some beta particle experiments that we have done, including using magnets to deflect them.
4) The Faraday effect, how we built that experiments and the results.
Your feedback would be greatly appreciated.
This channel is like a breath of fresh air among all the sponsored an bribed ones!
Our approach to product reviews means that in almost all cases, we need to go out and buy products to test which get expensive. Most manufacturers won't send us a sample of their equipment to test, they are usually just too scarred to do so, or don't have enough confidence in their products.
If it is that bad, I need one of the other dosimeters. Because I bought one over 20 years ago, I have had to put it in a drawer because my window is under the house waves and it would click so loudly after it rained in 2011 post 3/11 I had to put it in a drawer. The only time it actually made an alarm was riding with my brother on the interstate when he was trying to pass a white unmarked tractor trailer, and I pulled it out of my pocket and showed him, convinced him to slow down and exit to travel on another highway to get away from that truck. Other people carrying a Geiger counter because of 3/11 were having similar experiments on interstates encountering white unmarked tractor trailers. Apparently thefind it safer to move hot loads with no marking or fanfare
?
uhm those are usually nukes being transported.
Thanks for sharing your story.
The stray gamma radiation from nukes being transported certainly would not set the NukAlert off. I have read a lot of reviews that talk about it being triggered by sunlight, power lines, etc.
In a nuclear warhead, there are only three types of radioactive materials, Pu-239, U-235 and in older devices, H-3. The first 2 are alpha emitters and tritium is a beta emitter. Without expensive specialist detectors you would have trouble detecting any of those, even at short range (weapons grade material is very pure and so there won't be anything much in the way of decay products that are more detectable). Natural uranium ore is very detectable with low cost equipment (but not with the NukAlert) because it is billions of years old and has a lot of decay products contained in it.
Look on the bright side, I spent a lot more to test this PoS that you did 20 years ago when you bought it, which makes me the sucker! In addition to buying it, I needed to pay for shipping to China, importation duty, the x-ray source, when when added up comes to about $450...
In fairness, due to its small size, its a great addition to a "hall of shame". Its got a cool form factor and a great sales story behind it. The exact properties that we all should be cautious of when buying new things.
As an alternative i can suggest the Atom Swift. Its a tiny scintillator device that can be used as a keychain, it's mostly used with the mobile phone application that extends its capabilities alot, but even without the app its still very great and sensitive alarm device
Seems like a good device, but if I buy any more gamma ray spectrometers, I'm going to go bankrupt! I'm am going to be doing a review of the Radtus R103 soon though, it is more of a direct equivalent in terms of size and use-case.
Hello, thank you for drawing our attention to this non-compliant product. Sincerely, Antonio❤😊
Our pleasure!
dentist alert
14:21 I thought you were going to smash it with a hammer xD
It only detects fluorescence with a photoresistor, so it needs extreme amount of radiation to work. A total scam. lol
I like the robotic voice
Very good info! Thank you for the quick guide to fog camber rigging! I think that's MUCH more usable for peppers!
Do you have a link to that more powerful ionizer?
email me:
studio326@qq.com
@2:07 You got that straight
lol it just clicks rhythmically like a metronome. Let alone the fact that it just pretends to work, how dumb must the developer be to not use at least some form of entropy to fake it
What happens if you leave the source on the detector for a longer? Period does it pick it up? It might require more time to react with simple electronics.
I did a lot of experimentation behind the scenes and indeed did perform several 'saturation' tests, but again, nothing happened.
Very interesting! I thought that this device was legit because BNC was selling it, glad I watched the video. Not that I would have gotten one anyways since I have more suitable equipment, but still.
Where in hell did you found a 2n4117? All FETs I bought were bipolar transistors rebranded as FETs, meaning fake ones. The only ones I found were SMD from Interfet and the old ones I have in my junk box.
Thanks for the comment.
I have seen dodgy little resellers (usually they operate out of sheds in the countryside and keep moving around to avoid getting busted) re-marking cheaper components for more expensive ones, but for cheap transistors, that's pretty slim pickings. These days, those little fake component vendors are dying out - they would have completely died out if it wasn't for the Ukraine war. I heard that these remarking shops are now busy selling fake MCUs to Russia. Maybe its a coincidence, but the VKD has lost quite a few war-planes recently due to 'technical faults'.
I know quite a bit about these re-marking operations. My wife comes from the same rural part of Guangdong province where this is (or was) quite prevalent. I also work with a lot of factories here and they tell me a lot of stories about this and how they avoid getting screwed on component supply.
I got these JFETs on TaoBao. China has a lot of discrete semi manufacturing, though its aimed at the internal market. I have found all kinds of things here that seem to have died out in the west, diac triggers, uni-junction transistors, etc.
A funny story about the uni-junction transistors, a friend of mine in the UK was looking for some as part of a relaxation oscillator, but in the end, it was just a bit cheaper to get a Chinese 8 pin MCU (8051 clone) and create the same signal via PWM (a 13 cent MCU)...
Mind you, the 4117 isn't particularly special, most n-ch JFETs will work in this application. There is no HF gain requirements, the Vgs is fairly typical. Perhaps the ones I got are a different type, but they are certainly JFETs, and for this near-DC application, it probably doesn't matter. I think I paid 7 cents each for them (for a strip of 10 pieces).
@@project-326 I really don't know why FETs died out. Some say they were not trustable. But they are more resistant to static, to radiation and much lower thermal noise than MOSFETS. Certainly there are applications where they are preferred (hearing aid devices are one of those, maybe that is because I can only find them in SMD form).
UJTs I can still find easily here.
Great video as always. Thanks for sharing!
For such a price, I thought they'd use SBM-21 for the sensor to achieve the small size and sensitivity.
Then a minute down the test part, I'm totally angry about how terrible it is.
In comparison, the ionization chamber without special treated gas but filled with merely air works better than I expected!🤯
I was really surprised with how it worked detecting x-rays. It could detect a decent alpha source like Am-241 but was useless with my other sources. With the x-rays it was just amazing!
Always satisfied 😀 my curiosity with your comprehensive video..........please do a video on construction of the ionisation detector shown here ..... will be a fun weekend DIY project for viewers !!!!
perhaps, but there are already a lot of videos on this type of thing on RUclips. We do prefer to have unique content, that said, even when we have the ONLY video on something we came up with, it doesn't seem to get a lot of views.
The beta backscattering video and the IR chroma keying camera video both did poorly on RUclips, both of which are totally unique.
@@project-326 your detector looks more neat and professional looking…. 😊. With one modification…. Addition of a buzzer instead of an LED bulb….
Great review, I made more sophisticated electronic devices when I was in high school (late 1980s) with parts I bought at Radio Shack. Definitely a scam, IMO. At least 10x overpriced and overhyped.
this thing is just about tapping into peoples paranoia and exploiting them for profit.
it might be off by a little bit from the contents you make on your channel, but could you please review the "ANENG 681 multimeter"? I would like to hear your opinions about it
Yep, it's a little out of our 'wheel house', perhaps you can try posting this question with Tony Albus on his awesome channel?
Good luck!
Thank you for the honest evaluation.
The cheapest detector i have is a "Hakarucchi ipt'a" which i got for less than 30$ shipped in 2014. The "RAT-1W" is the same probably with other look. These where sold after fukushima. They are no longer available, take 3 AAA batteries and have a single button and simple display. They can display average radiation of the last 1-6min (0.1ySv/h - 19.9ySv/h) and lifetime dosage. Mine remembers the lifetime value without batteries since many years. Also shows around 0.1 for background and 2.3 for a old camera lense with thorium, next to it after a few minutes. Considering the inflation since 2014 and that this included shipping, thats quite cheap. Mine has a blue label with a picture of playing children and butterflies on it. I think these where made in japan without any intend to make a profit but rather help people after fukushima. Iam not 100% sure what detector it uses but i think its some semiconductor detector.
The huge markup is not as infuriating as the fact that this is just a crude X-ray detector and nothing else. Big thanks for exposing this piece of garbage.
Its people being sold a fake sense of security that really bugs me!
@project-326 they used every trick in the book to ensure that sense of security. I'm surprised that FCC and CE have not caught up with this scam. Hopefully, your work will raise some alarm bells.
@@duke_of_oz Normally the FCC and CE won't intervene, they don't want to use the resources. Well, unless it is a Chinese product, in which case there will be customs seizures and a "SWAT team" type response...
The Gamma Scout doesn't have FCC certification either and that has been available in the USA for decades.
Yup. The gadox has zero response to anything north of about 200keV, no response to alpha or gamma. Using a CdS cell is making a bad product even worse.😢
@project-326 since you already have it try replacing the CdS cell with a J fet and photodiode. Then put a LYSO crystal in it. Should make it a lot more sensitive, at least able to respond to the Sr90 and 137Cs check disk.
One alternative I can think of is the Radtus R103
Thanks for the info! I just took a look at that device, looks like an interesting product. Hopefully one day we can review that on this channel.
17:50 min: An addition to your statement that gadolinium oxysulfide is 3000 times less sensitive to Cs-137 than to X-rays and has a shockingly low sensitivity to gamma radiation. If you read the patent US6897448, the sensor consists of 4 components: a transparent cone, 2 layers of phosphor and on top (outside) a high-density metal coating. The author recommends lead. It could therefore be that the sensor is surrounded by a thin lead foil and only the bremsstrahlung generated in it reaches the phosphor and interacts with it. It is then also sensitive to this. That would explain why your first X-ray tube had no effect; the lead completely shielded the low-energy radiation.
It could therefore be that the sensor is more sensitive to radiation that generates a lot of bremsstrahlung.
The product data sheet also states that the newer versions don't have the lead foil added.
Besides, photons don't generate bremstrahlung, only particles (ie things with mass) can do that. The other point is that bremstrahlung is a very small effect compared to the original flux of beta's or other particles that give rise to it, ie the efficiency is very low. A typical x-ray tube, which is about as an efficient bremstrahlung source as it is possible to create (ie vacuum, high density target, etc) has a typical energy efficiency less than 1%. For incidental bremstrahlung, you can expect the efficiency to be somewhere between 0.1 and 0.001%.
I hope that helps.
Thank you for this!
My pleasure!
Again a great video , thank you!
My pleasure!
Can you give more information on the 'New soft x-ray source'? Thanks!@
if you send me an email, I can share some details (channel page -> about)
The GammaScout most likely has a gas tube in it while the others have a scintillator crystal.
Under high flux the tube don't work properly as a continiously conductive path exists and it stops counting.
Not good but expected behavior.
Actually, in the testing section, the BR6, HFS-10, HTT-60 and FS-5000 are also GM tube devices.
Typically with a GM tube, once the count rate gets too high, the dead-time limits the count rate to a pretty fixed maximum. To become continuously conducting, the tube voltage needs to be increased, taking outside of the Geiger plateau region and into the continuous discharge region.
We have a separate review video on the Gamma Scout, it is a device that we have a long history with and features in many of the review videos...
we also have reviews on all of the other devices shown in the testing (with the exception of the RAM-01).
@@project-326 Thanks for the response! Clearlly I was miss informed about the detector types. Making the GammaScout results even weirder.
@@faxezu Whilst this is a sort of educational channel, we try to have fun too. The Gamma Scout is just a badly designed device, the company that makes it, has a real dislike of this channel, every now and then one of their people shows up in the comments on a hate-fest. We have pretty much figured out who their small team in Germany are now and what Google accounts they use.
Will probably have to go through the process again with the people behind this horrid NukAlert...
It strange, there are a lot of videos featuring it, but only with a view to selling it. Well, there is a full review on the product now!
🙂
@@project-326 I might be German, but I swear to have no affiliations to GammaScout 😄
Thanks for the nice video and sorry again if my first comment sounded negative!
Do you have a video of the best one for rhe money?
working on that!
Hello, can you, please, do a review for the HFS-P3 Pocket Pen Type Nuclear Radiation Detector if it is a piece of 💩 or in some cases it can be useful.
Thanks.
Top channel , Top videos , all the time you have all the best subjects good to watch 3 or 4 times , i like
I wished I would have seen this video before I spent $180 on a nukalert. Maybe I will give it to my parents 😂
Great video dude
Appreciate it
great check, I have toght it use diode semiconductor and sense over beta. It would make sense for a cheap device, but it is actually not cheap at all. As the mica window at my inspector Geiger mueller pancake tube has broken and never found a cause, maybe due to the travel over mountain and air pressure change or even manufacturing defect. Besides the replacement from the LND the decision was also to get one rugged LND 71210 for the safety situation. In the case of explosion the blast pressure may destroy mica and make it useless, so the cylindric tube that use more rugged window may be more reliable. It is also energy compensated so may be used for better measurement of some sources. For the same reason it was expected that nuke alert use diode rather then mica. Tested and LND 71210 performs quite fine on the same GM made for their pancake tube, just the calibration is different. Sensitivity of ion chambers is lower then GM, but they have great linearity so they are good for measurement.
Thanks for the feedback. Those kinds of alpha capable GM tubes are very fragile...
The proportional region of the curve is certainly much better for linearity and can even be used for spectroscopy, etc but has really terrible detection sensitivity...
We are actually considering creating a DIY device that is small like the NukAlert but actually works...
@@project-326 scintillators may be fine solution, but they are expensive, so diode appears as an acceptable solution for high contamination. But the main purpose of such detector is when to get out of the shelter and where to move, as the initial blast does not need detector.
Well, you know what they say, put shit in a pretty package and people will buy it. LOL HA HA
I am surprised that this has good reviews on Amazon. Just shows these people don't test their products or it is just another case of Amazon pushing scams.
How would anyone know if it works or not, unless they can convince a friendly dentist or doctor to help them...
I saw loads of reviews that said it went off in situation X or Y but I think those are related to sunlight getting into the unit.
Congrats Max! 😎
I so love this channel !
what corner of the internet did you go to for your new soft xray source?
studio326@qq.com
Congratulations on the baby 🎉😊👍✨
Max says "Thank you!"
The PIC12F5xx series are the absolute cheapest of PIC chips. They are great for small simple jobs and I've used them for many projects because they cost $0.60 each. The CDS cell is also the cheapest possible sensor and even a simple photodiode alone would probably do a better job. I'd even wager that a 1N914 signal diode might be more sensitive and cost less.
I'd love to download the firmware of the chip and disassemble it for shits and giggles. I suspect it will grossly under utilize the capabilities of these PIC chips
PIN diodes work way better. I tested with a set of 6 * BPW34S and a differential TIA circuit, resulting in a response of 15 CPM/uSv.
Great Video
I mean, it "ticks" on a regular basis, so that's a huge red flag. They could've at least faked it by randomising the delay between each "tick".
ironically, that is supposed to be so that you know its still "working"...
@davehimlin2374 There is no need for such functionality as the environment radiates enough particles for a detector to tick, and thus let itself known to the user that it is on.
I didn't hear that fucking big bang, didn't see the blinding flash or massive mushroom cloud nor feel the heat or shock wave. Lucky my keyring is bleeping or I would never have know about that fucking great big bomb!
Lawsuit material ❤
I really hope so, we will go from less than 10K subs to 100K subs in about 2 days!
:-)
You make my day !
I'm supposed to trust a robot voice channel over a company that's been in business for over two decades. 😂
They have indeed been in business for 2 decades, and frankly they have been scamming people for so long that I needed to make a video to show why it actually is useless for its intended purpose. It's just an x-ray detector...
Is it possible you got a dud?
Doesn't seem like a true scam. At least the design technically functions as a radiation detector. I'm sure there was a much better design someone made but the accounting department demanded that they cheapify it.
The creator of the NukAlert was a one man team, I believe he took on some staff and uses sales agents, but that isn't the same thing as internal company pressure.
I get the feeling that this was the only design he created, the company only has one product and has been selling the hell out of it for over 20 years.
You are right, it functions just enough to avoid a class action.
Thanks for the feedback!
if this turns red, your ded lol
The nukalert works well for it's intended purpose. It was designed to detect rads per hour, not milirads. The nukalert WILL alert you to high levels of radiation, it's not going to work for your grandma's trip to the antique shop hunting uranium glass. 😂
sadly, the sensing material used in the NukeAlert won't even help with that, it's only sensitive to x-rays.
"The nukalert works well for it's intended purpose"
I'm curious now, how do you know that it does? Other that the tests that we ran, there is only one video anywhere of it doing anything (please do let us know if you find any others), and its that one using a dental x-ray machine.
Anyway, I'm pleased that you did actually get an FS-5000, it's a great product and well built (for the price) and you won't have to take anyone's word for it that it works, you can test that device yourself.
@@project-326 I'm a noob in this so help me out. If a nuclear power plant blew up 150 miles away from me and fallout was blown over my house you're saying that they nukalert wouldn't detect that? Would the FS-5000 pick it up? Because I just bought that based off your other video 😆
@@TaylorHaubrich The FS-5K can pick up the background radiation level, so you can be sure it will indicate levels above normal background. You can even take it down to you local home depot and put it next to some ionization smoke alarms, you should be able to pick up the feint gamma emissions from the Am241 source inside the package.
Hope that helps...
@@project-326 yes I ordered one from the AliExpress link in your video description. my only concern is if my fallout shelter is doing its job then I shouldn't pick up any reading on the FS-5000. How do I know there's fallout without taking my geiger outside? 😆
Uses a CdS cell with a x ray intensifier screen for a detector? That is purely garbage. Even using a naked pin photodiode would be better.
The original Russian one was decent. It dis more or less the same thing and the battery could be changed. A 10uCi check disk would get it to beep and was loud enough to easily hear it. It was only for detecting dangerous levels of radioactivity and also was only 25 bucks😂 180 bucks could get a decent geiger counter.
The Russian one used an actual GM tube, so it really worked with gamma...
Thanks for the feedback!
I appreciate you took it apart and told us about its design, however, I disagree with many points in the video. Why not buy a cheap Geiger counter instead? Well, because under nuclear attack it would be useless, it can behave as Gamma Scout did or show zero. Even if it didn't, what is it good for when it tells you you have gone beyond 10mR/h? Surface bursts create fallout plumes where radiation field reaches hundreds of R/h. I'm talking about gamma only, during the "acute phase" it doesn't make much sense to care about beta other than keeping fallout particles away from your skin and preveting their inhalation when fallout descends, there are almost no dosimeters that show you beta dose rate (all those who "measure" beta with their Geiger counters and gamma scintillators do it wrong). Cheap Geiger counters are often gamma non-compensated and not even beta shielded, so they show nonsense values in mixed radiation field, another reason why relying on them only is a bad idea. Geiger counter with range up to 10-100mR/h may be useful inside a fallout shelter. By the way, deposited radioactive fallout is a plane source, removing some contamination from the shelter won't save you from radiation sickness, it's proper shielding that does. Civil defense protective measures were designed to prevent people from suffering acute effects of radiation exposure such as radiation burns and sickness, those short lived isotopes which you mentioned as not important are actually those that matter the most, during the first day or two their gamma radiation delivers the greatest portion of the total dose. As they decay fast, they have very high specific activity. Cs-137 won't be an acute hazard. When it becomes the major contributor to gamma dose rate (about 4 years after the explosion), there will be no areas of immediate danger, maybe except the very epicentres of surface bursts. By that time Nukalert may be almost useless. Of course it doesn't mean you can't use Cs-137 for the purpose of Nukalert validation, you just have to use a source strong enough to create that R/h range gamma field. In my opinion telling people that Nukalert is useless and that they should buy a low range Geiger counter is dangerous. If the Nukalert scintillator responds mainly to X-rays, there is a remedy for that - energy compensation and the patent mentions that. Not only the layer of lead attenuates low energy radiation (preventing falsely high readings), when high energy photons come, they liberate electrons leading to stronger response. X-ray testing you have shown may be good to test if it can respond to radiation but without further data (spectrum of the X-ray source, energy characteristics of the detector - after compensation!) and calculations it can't be used for indicated value verification.
I wonder what caused it to chirp such a long time after the X-ray burst, maybe the burst was so intense that it damaged the detector and/or the electronics.
That's the way is it 'supposed' to work, according to the patent and the product documentation. The MCU flashes the LED to [allegedly] make the phospher more sensitive, which triggers the LDR, which in turn causes the MCU to flash the LED. They do this to make it have some sensitivity.
So, this ends up with a system that has a crazy long time constant when triggered.
Thank you for the long and well thought out comment.
One thing I learned, when talking to people in the prepper movement, is that everyone seems to have a slightly different view on what a nuclear exchange would look like. Expectations vary from "the government will be back up and running in a month or so" to "back to the stone age", and this has a lot of effect on the use case.
I fully agree, short half-life products are more dangerous, far more so, but if you are going to stay holed up in a 'bunker' (ie use case is important) for a month or more, then actually it is the medium term fission products that will become more relevant to long term survival.
In any cases, the simple fact that the NukAlert is almost totally insensitive to gamma above 100 KeV, means that even very high dose rate fall out will not be detected by this thing. The Gd2O2S scintillation material has almost no sensitivity at the important gamma energy levels.
The manufacturer is well aware of the failings of this device, what is important to them is sales, not functionality.
What I would caution over is comparing devices intended for civilian use and those that were created for military use. Cold war military doctrine, on both sides was not something that produced equipment that would be helpful to civilians.
In the cold war, the expectation was that soldiers would take cover in preassigned locations. The side that sent its soldiers out at the "right" time would win the battle. Come out too early and the soldiers will be incapacitated very quickly, come out too late and the enemy has already over run your positions. These types of calculations were not factoring in long term health of the soldiers...
Oh nein! The Gamma Scout is no longer on top of Project 326s S List?
I consider a dislike- when I stop crying!
Don't worry, the GS has more features, so has many more ways to disappoint us. It's pretty hard to poke fun at something with the functionality of a paperweight.
There is also a patent for this garbage...
The US has a pretty terrible patent system, its filled with spam.
DENTISTAlert 🤣
indeed!
Interesting (but crappy) product.
Hi, please please please ... stay away of F*** word, you know so much about science stuff :).
We will ask Posh Arthur to tone it down next time...
@@project-326 I agree...I think it would be nice for families with kids to watch this channel together. It could be very educational for interested science minded children.
@@alastairbrickell8813 We are considering starting a new channel, just for experiments for kids, but a little less patronizing and dumbed down as the other 'kids science channels'.
IMO this is a scam, thank you for the video.
roflmao
Hello my dear friend, have you checked out the Fnirsi gc 02 or it's clone ERICKHILL Geiger Counter?
I haven't tested it but I saw another review and it seems this device is using pretty horrible HH71x tube. Basically they have taken all the cheap options from the GC-01 and rolled it into an even crappier product.
Hello. Dude on this video ruclips.net/video/XbAV6qaor38/видео.html showing many dosimetrs going off the charts. But u have use translated subtitles
an interesting video, thanks for pointing that one out to me.
OMG pic12C5xx 😂😂😂😂