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How did you set up your ludlum 2221? I couldnt find it on the forums.

its not useless you can get hundreds of R\hr 50 miles downwind from a 800 kiloton ground burst and fallout patterns overlap its to take readings outside a shelter you don't stay out in those levels

Hello! Would you know where to buy the 107B battery adapter? Thank you!

How's the unit holding up? Any issues? Thanks!

Bonjour. Super video merci ! J ai une question je suis français et la traduction me dit n'importe quoi avec les condensateurs et je ne peux pas bien les voire pouvez vous m écrire les références des condensateurs que vous remplacer pour que je puisse réparer le mien ? Merci beaucoup.

Awesome video, question do you still repair these and if you do would I be able to send one to you for repair?

Do you still have the hardware for this? I had long meant to reach out and suggest you cut afew spiral grooves in the copper pipe to induce an axial field component. Essentially making a screw pinch.

Thanks, I just got a Lionel cdv 700. I can only find the geiger muller tubes used on ebay, is there another place to get them?

Hello. This was a super useful video! Are you still planning on releasing more videos in the series? I would love to learn more.

In case you weren't aware, the audio on this video is very difficult to listen to on headphones; I had to put my audio output on the mono setting which made it far easier to listen to. OK, my complaint over, great video otherwise and very interesting subject.

yeah I reactivate battery's all the time, but I do it with a battery charger. It might help you with your electric bill geting one.

What is "count"?

Looks great! Love the build quality.

I just got this drone and only flew it a few times not very far. I wanted to fly in 14mph winds and I was really nervous and chickened out. Cool to see that is can handle some decent wind.

Is the CDV bone stock? No modifications have been done to it? I just bought a couple of photomultiplier tubes and I wanted to use them as scintillation detectors. It would be pretty cool if I could use one of these to drive them

The thing about the dekatron is that it both counts and displays. All it requires is a monostable circuit that energises the guide electrode to advance the count to the next cathode.

Excellent video! I have a unit with the classic yellowing, wondering if you have a source for replacement crystals, or even better yet, a plastic scintillator replacement haha! Would love to talk more about powering this without 8 batteries of obscure varieties, issue I am finding is that the wiring diagram seems to differ from how my unit is wired in the battery box. Would love to use a rechargeable power tool battery and a variety of boost drivers, but the "negative voltages" give me the creeps

I know, it's not a geiger counter, it has no Real geiger Müller tube,it has a ionization chamber instead.i got mine more for my collection of vintage test Equipment. This Thing Shows radiation only in high Levels, if it Shows something, you have to leave your town.

Cheer~~~the branch of science and technology concerned with atomic nuclei and nucleons, especially the exploitation of nuclear power.😊

Seen another info vid on these and the guy there claimed ideally you want both the 715 and the 700. He said he'd get the high range first though as it will tell you dangerous levels you shouldn't be in at all or even momentarily, whereas the 700 maxes out too low and it's more for determining long term exposure levels that may be harmful if you stayed in them. Is that inaccurate? What modern alternatives would you recommend?

Extremely interesting... fascinating, however sir: 1} What were the outgassing rates of the cured epoxy resin when subjected to UHV conditions, and how did these outgassed species interact with the plasma dynamics within the inertial electrostatic confinement chamber? 2} How did the dielectric constant and breakdown voltage of the epoxy resin affect the electric field distribution within the fusor, especially in proximity to the inner grid where ion acceleration occurs sir? 3} so...given the thermal conductivity coefficients of the epoxy resin, how were thermal gradients managed across the fusor assembly, and what impact did these gradients have on the mechanical stress distribution and potential vacuum seal integrity under continuous operational conditions? 4} What is the long-term chemical stability of the epoxy resin in the presence of reactive species generated within the chamber sir, such as ozone or nitrogen oxides, and how could this affect the polymer's molecular structure and its capability to maintain a hermetic vacuum seal? 5} What were the viscoelastic properties of the epoxy resin under varying temperature and pressure conditions encountered during fusor operation, and how did these properties influence the dimensional stability of the fusor components, particularly in relation to maintaining precise alignment of the electrode grids? Very beautiful work...I hold PhD electrical engineering & computational physics...

Nice! Too strong electromagnetic waves affected camera ! 👍🔥

Did you ever figure out the fault in the HV section? I'm having an identical issue on my unit, where it never goes past a few hundred volts and makes a sad buzzing noise

I'll like to have your Gmail

Weldon sir

That is super cool!!!

That's a classic, where did you find that? What's the serial number, 76-?

Please, I need you for business deal sir... Can I have your Gmail?

Wow This is amazing Please I'm your new follower, and I need your help, can i have your Gmail address?

Really interesting video. Before finding this video, I did similar tests on an old watch I had sitting in my watch-box beside my desk and found very similar results. Background radiation on my detector was around 0.08 microsieverts per hour and when in contact with the watch rose drastically to 2.8 millisieverts per hour - 35x the dose of background radiation, as opposed to your findings with your watch of 25x.

Can you estimate the age of manufacture based on the relative size of the gamma spectrum peaks for the radium?

Please make the video on your custom flybacks construction please. Thanks

This was a neat demo. Really makes me wonder what it is that "wears out" about radium paint. Does the zinc or sulfur transform from the radiation to another element (that would suggest some neutron absorption, which I'm not aware of anything like that in the Ra decay chain? Google suggests the "crystal structure" is changed - but how? Why does crystal structure change affect the ability to react to radiation for luminescence? Why can it react to UV (but with poor persistence) but not radiation? Such a curious change.

Nice video, Getting extremely to even get lead here, banned at most hardware except for registered trade supply

I was told assemble conflat finger tight, put it on a roughing pump, finger tight again then crank till vacuum is where you want it, seen flanges done 4-5 times

If one is interested in a nice geiger counter, look into a GQ GMC-600+. It is capable of alpha, beta, gamma, and xray detection up to 0.425 rem/hr. Please note that because of its detection capabilities and range, it will cost you around $350. If you wanna go cheaper like $150, try the GMC-500+. It is a combination of the CDV-700 and 715 with a low and high level tube. However, this only maxes out at 4.25 rem/hr while the CDV-715 can handle up to 500 rem/hr. Just for reference, half an hour of exposure at 500 rem/hr results in a 50% chance of death after 14 days. A radioactive floor tile from home depot is going to be 3.3 million times less radioactive than what the 715 maxes out at.

Thanks, Lots of really good tips there . Hmm! Dunway not shipping to Australia. Bolts- I believe they are silver plated. But are they Stainless steel or carbon ? We can get stainless at the hardware at $5 AU a bolt JB weld -$15Au here VG gaskets - strangely the low oxygen copper 2.75 we can get here and are cheaper than the VG 2.75 set which doesn't ship anyway Looking forward to the other vids. By the way in one of the previous vids you did a run with a fore pump only and converted the Ludlum CPS to N/S . Its always confused mre how to calculate that . Im thinking its somehow related to possibly chamber size , voltage , grid or current ( possibly other constraints) do you have any advise or references etc. on that topic , much appreciated .

How... how did I get here?

Splendid presentation !!! Excellent information! Thank you so very much for taking the time document your research. I'd love to just sit down with you and listen to ALL of your vacuum experiences and rules of thumb, it sounds like you've had quite a few.

Pull a spectrum off it to evaluate the fwhm.

Well howdy!

Another great video. Thanks!. I haven't used the Theremino software, but I assume you could store individual spectra, and then superimpose one with another. I'd like to see the pre-illumination spectra of the radium source perhaps as a blue trace, and then superimposed on that the post-illumination spectra of the radium in red so you could see a direct comparison of the locations, heights, and widths of the peaks. I would surmise they wouldn't be that different, but such a visual comparison would be helpful. Keep up the great work. -- Ken, WBØOCV

Great video! Did you try exposing the various fluorite crystals to ultraviolet light to see which ones, if any, fluoresce under UV? Fluorite is one of the more common fluorescent menerals collected by those who like fluorescent rocks. It would make sense that something that would fluoresce under UV might make a "better" scintillation detector, but we are talking vastly different energies from UV (fractions of a keV, perhaps up to 0.005 keV)) versus something like Co-60 (thousands of keV, specifically 1173 and 1332 keV). Thanks again for the great video. -- Ken

Wow. Never knew about that!

Cool! I didn't even know fluorite was used as a scintillator until a few days ago when the Angry Turtle gems guy did a short video on cutting some synthetic fluorite originally intended for just this purpose. May I suggest another experiment with it? Boil a cup of water and dip the fluorite end of the assembly (in a plastic bag or something to eliminate water ingress) into the water to see if you can just start to see the onset of thermoluminescence from the fluorite due to lattice defects and F-centers accumulated during its time exposed to ambient radiation underground.

excellent vid

2" lead is over 10x reduction for 6MeV & Cs-137 0.662MeV, so likely closer to 100x reduction for Cs-137

Is the lead pre- or post- nuclear weapons testing refined? You need pre-weapins testing refined lead to get background really low, but you dont need that for measuring actual x-ray (uranium) & gamma ray (Cs-137) sources.

Very good illustration and educational, Mark. Thank you for doing this video work.

Looks professional. Watching with interest from one of the largest laser ICF systems to see what kind of n production rate you get 🫡