Thanks, @ DextersTechLab. I was idly shopping for a geiger counter on ebay and, ebay being a magnet for scammers, sorting by price, there are many listings that contain the term "geiger counter" but aren't for geiger counters at all. There are dosimeters like this, and non-ionizing radiation meters. Among the first several pages, I found a few legit listings - a geiger tube from which to build a meter for just 12 USD... Individual dosimeters like these, but without the charger, they're useless, and it's not clear if they ship them charged. Would be useful to know how long they stay charged (normally/in a lead-lined box) or per the documentation, claim to stay charged.
Got 2 soviet DKP-50 pen dosimeters and a CDV-742 kit (6x 200R dosimeters + charger) from ebay. Now after more than a year all of them are still are at zero. (One cdv-742 doesn't hold a charge though)
Interesting I knew it was a capacitor that would discharge as it was exposed to radiation, but never knew how the indicator worked. Thanks for the vid.
The fiber indicator line keeps shifting , tilted . Adjusted the eye piece to proper alignment but then the indicator line tilts after awhile. Could the mechanism/ housing that the crystal fiber be loose?
Great video. Just wondering could u give me some advice because i have just got one of these in the post and i don’t know how to charge the pens can i help me please
How can i charge a single unit without their Piezoelectric charging unit? Is it possible to pass the correct energy into the units electrode and bypass the large unit?
I doubt these are very accurate. Even the self discharge numbers in the manual vary wildly depending on temperature and relative humidity. Plus, being somewhat mechanical in nature, they probably don't handle shocks too well. But if nothing else is available, I'd still prefer to have a couple in my pocket.
@@drezster Even if they are accurate to within 10-20 rads, you will get an idea if your are in a danger zone. The Soviets produced them by the zillion. The price is right. I would leave them outside a shelter area as sensors that give you an idea whether there is a large dose of radiation to worry about.
@@Phoenix88. Each of my old new stock ID-1s will hold a charge for several weeks which means their capacitor is still good. I am thinking they will function OK.
Hi Dexter. I have one of this "pens", or actually it is scaled from 0-50 roentgens so it is not exactly the same model, but very similar. Sadly, I dont have the charger. Would you be able to measure the voltage over the electrodes. If you measure the voltage over the electrodes when the instument is on zero, that miht give me an idea of which voltage I need to supply. Maybe I can make a charger myself, i I know the voltage needed. That would be very helpful. Thanks for the video!
I have the UK equivalent of this type of dosimeter. The voltage required is about 200-250 volts on the UK one. Slowly turn the voltage up until the needle is on zero. You need to arrange to be able to see the scale while charging. I use an LED illuminating a short piece of hollow glass rod. The connector runs through the rod and contacts the dosimeter. In the UK one the base has to be pressed in during the charging process.
Yes, you simply recharge it on the charging unit. The manual says typical life of 10,000 charges. The pen i disassembled is now permanently broken as hey are not intended to be disassembled.
![[SFM] Risky Recital](http://i.ytimg.com/vi/RzNkY1_Nk3o/mqdefault.jpg)
Been wanting to see the insides of one of these pens. Awesome video!
did it in real life with a hacksaw and a cd v-742 its dissapointing
Thanks, @ DextersTechLab. I was idly shopping for a geiger counter on ebay and, ebay being a magnet for scammers, sorting by price, there are many listings that contain the term "geiger counter" but aren't for geiger counters at all. There are dosimeters like this, and non-ionizing radiation meters. Among the first several pages, I found a few legit listings - a geiger tube from which to build a meter for just 12 USD...
Individual dosimeters like these, but without the charger, they're useless, and it's not clear if they ship them charged. Would be useful to know how long they stay charged (normally/in a lead-lined box) or per the documentation, claim to stay charged.
Got 2 soviet DKP-50 pen dosimeters and a CDV-742 kit (6x 200R dosimeters + charger) from ebay. Now after more than a year all of them are still are at zero. (One cdv-742 doesn't hold a charge though)
Interesting I knew it was a capacitor that would discharge as it was exposed to radiation, but never knew how the indicator worked. Thanks for the vid.
Oldish tech but still fascinating video's; Thanks for the looks inside
The fiber indicator line keeps shifting , tilted . Adjusted the eye piece to proper alignment but then the indicator line tilts after awhile. Could the mechanism/ housing that the crystal fiber be loose?
Great video. Just wondering could u give me some advice because i have just got one of these in the post and i don’t know how to charge the pens can i help me please
How can i charge a single unit without their Piezoelectric charging unit? Is it possible to pass the correct energy into the units electrode and bypass the large unit?
Any idea how accurate these dosimeters are?
I doubt these are very accurate. Even the self discharge numbers in the manual vary wildly depending on temperature and relative humidity. Plus, being somewhat mechanical in nature, they probably don't handle shocks too well. But if nothing else is available, I'd still prefer to have a couple in my pocket.
@@drezster Even if they are accurate to within 10-20 rads, you will get an idea if your are in a danger zone. The Soviets produced them by the zillion. The price is right.
I would leave them outside a shelter area as sensors that give you an idea whether there is a large dose of radiation to worry about.
I have a few soviet and US made ones. They still are as accurate as a modern geiger counter.
@@Phoenix88. Each of my old new stock ID-1s will hold a charge for several weeks which means their capacitor is still good. I am thinking they will function OK.
what is outer diameter of dosimeter in millimeters
Hi Dexter. I have one of this "pens", or actually it is scaled from 0-50 roentgens so it is not exactly the same model, but very similar. Sadly, I dont have the charger. Would you be able to measure the voltage over the electrodes. If you measure the voltage over the electrodes when the instument is on zero, that miht give me an idea of which voltage I need to supply. Maybe I can make a charger myself, i I know the voltage needed. That would be very helpful. Thanks for the video!
I have the UK equivalent of this type of dosimeter. The voltage required is about 200-250 volts on the UK one. Slowly turn the voltage up until the needle is on zero. You need to arrange to be able to see the scale while charging. I use an LED illuminating a short piece of hollow glass rod. The connector runs through the rod and contacts the dosimeter. In the UK one the base has to be pressed in during the charging process.
CAN THE PEN BE REUSED?
Yes, you simply recharge it on the charging unit. The manual says typical life of 10,000 charges. The pen i disassembled is now permanently broken as hey are not intended to be disassembled.
DextersLab2013 Thats really a good design though. Yea, i saw the same device in ebay. And now absolutely I will buy it. Thank you
Is the CD V-742 about the same ? Thank you for the video ! tjl
Yes, they operate on the same principal so should be very similar inside.
@@DextersTechLab yes about the same less conplex than the russian one
У мне Советский дп24
Иван Корасёв нормальный прибор. Жаль не фиксирует нейтронное излучение, а ид-1 фиксирует.