What a lovely device!

Great demonstration, you should see if you can get your hands on the 720 at some point, the DP-2 source will register on that really easily, as it has the thin beta plate on the bottom with the ratcheting cover. Also might be worth seeing if you can get a British MD3 meter cheaply where you are, in the UK the MOD surplussed hundreds of them within the last few years so they are often about £35 on ebay for a retrofitted Cold war ionisation chamber that's been calibrated as of about the 1990s. You can fully open them up to register alpha etc or use them with the flip cover underneath for beta or x-rays/gamma.

@radiumquetzal8000

3 жыл бұрын

Interesting, i have looked a bit into that 720 after I saw you using it and it is really something I'd like to get some day. Does sadly not seem to be any good ones for sale at the moment, either not tested or too expensive. I do have another type of high range ionization chamber on it's way though, a Victoreen 470A which should be alpha, beta gamma xray sensitive down to 10keV and work up to 1000R.

Really interesting. I would love to have the Geiger counter. Great video!

Cool!

Cool device! I wanna this one too. By the way I recently got DP-2 with this radioactive source inside:)

@inductivelycoupledplasma6207

3 жыл бұрын

Oh wow. I could only ever dream of owning a DP-2 source. Where did you buy your DP-2?

@thescience786

3 жыл бұрын

@@inductivelycoupledplasma6207 just accidentally found on internet store. It coasted only about 10$. Today I opened it and took this check source out. It gives more than 1R/h

@inductivelycoupledplasma6207

3 жыл бұрын

Fuck, what a lucky find. Those sources are insane. Probably in the 10s of R/h since most detectors saturate in proximity to much a source

@thescience786

3 жыл бұрын

@@inductivelycoupledplasma6207 Yeah

@punishedgloyperstormtroope8098

3 жыл бұрын

@@thescience786 what was the source? Radium?

Si estos Geigers son vintage, necesitan calibrarlos de nuevo? Acabo de comprar CDV-715 me gustaria aprender mas sobre ellos y como usarlos, me a gustado tu demostracion...

@miguelcardozo9935

Жыл бұрын

Si ocupan ser calibrado, en Texas hay un lugar que se llama KI4U INC, que es el único lugar donde podrías mandarlo para ser calibrado.

The Instruction Book plainly tells you that using the 25ft cable greatly slows down response time and also degrades accuracy somewhat.....I really don't understand this option because the Radiation strength outside your shelter is not what's important, it's the level of Radiation INSIDE your shelter that's important.... That said I own two CD V715's, One 717, one 720 and even one 710...all of them work and detect Radaition but only one 715 is Calibrated

12:04 This is not good for the GM tube, I guess, as it might worsen its performance by depleting the quenching gas, but thanks a lot for showing it. 👍 That's what would happen to vast majority of comercially available Geiger counters if there was a low altitude nuclear explosion creating a fallout plume. The initial exposure rates (gamma) reach hundreds of R/h. And for sure there are people who buy things like BR-6 for the event of nuclear attack, being totally unaware of many important facts. I wonder how would they react if there's an attack and the meter shows zero...

@Ales.2000

Жыл бұрын

Some explanation of what's probably going on in the GM tube under these conditions. The space inside becomes ionized so much (or so often) that the electric discharge goes on uninterrupted. I'm pretty sure the GM tube is not designed to withstand such extreme conditions. The quenching gas is likely to get depleted, that will lead to increase in dead time and maybe the own background. You might be interested in why it shows zero, well, that's because the current through the tube is more or less constant (like if it was a neon lamp). The pulses are often coupled through a capacitor going to some transistor amplifier. But when there's no change in current, nothing passes through the capacitor, thus, no pulses are registered.

@Ales.2000

Жыл бұрын

Theoretically, if the discharge is not stable, and that's common in some discharge lamps, some pulses may occur and the meter will show nonzero but nonsense reading. And I've got another theory about the zero reading. Maybe there are no pulses because the voltage across the tube holds somewhere around the level where it normally starts counting.

@radiumquetzal8000

Жыл бұрын

@@Ales.2000 Yes the 0 reading is due to the discharge being fairly constant. When the meter is exposed to an even more intense radiation field such as in other x-ray videos I have, it starts to show random readings instead which is interesting, maybe due to the reason you mentioned.

Yikes. A lume kit. Those tend to be pretty awful high emitters.

Dude, you need to invest in some lead if you want to continue with your experiments. I'm pretty sure is illegal in most countries the emission levels you are dealing with without proper shielding.

@radiumquetzal8000

3 жыл бұрын

Not really when it comes to lead. Depends on what source you are talking about. The Sr-90 source does not need lead, simple glass jar blocks over 95% of the beta, and the x-ray generation is low enough for the inverse square law to do the trick at any significant distance. The same when it comes to the radium source, it can't be detected after a few meters without shielding, less then 1 with shielding, which I use to store it. The x-rays from the x-ray machine are easily handled as all walls are thick concrete and some simple glass, lead or steal plates works amazingly to bring down the levels to only a few uSv/h. Regarding legal aspect, yes the activity of the Sr-90 is over the limit, but so are most sources pretty much all nuclear hobbyist owns. Any old Sr-90 check source from survey or geiger counters are over the limit, yet about 70% of people I have talked to owns them. I have even herd that exporting military surplus from Ukraine is illegal, but it's still for sale everywhere. It's also not ok to take out the Am-241 disc from smoke detectors, yet everyone I have ever talked to within this hobby has done that. The main reason behind the actions taken when it comes to people with sources is that their handling of them pose a danger to other people, something which does not happen with any of these. I have had friends that got visits but still was able to keep sources over the limit as they did not pose any danger with how they got stored and handled.

@radiumquetzal8000

3 жыл бұрын

@cody austin I'm guessing you are referring to the source trgroupinc demonstrates a few times. A civilian can't obtain those as they are licensed sources. The max Cs-137 activity for an unlicensed civilian is 10uCi in one source, though one can buy multiple of them.