1 ATM ( atmospheric pressure) Ion Chambers, even of excellent modern design reach their low end at about 3 mR/H full scale. This is with every conceivable...
Hi, I am now a proud owner of a CDV-700 ALL ORIGINAL like new in box except for the GM tube, which was omitted. I have purchsed two new LND-720 tubes as...
On the other hand, there are several great advantages to the Ion Chamber ... For one thing, my 440 RF/C has a low range of 1 mr/H full scale, the older 440 is...
Sound to me as though you have a bad electrolytic capacitor (the dielectric in these and the materials from which they are made deteriorate over time if not...
I removed my furnace filter and on a whim, used my CDV 700 to check it. It registered 6 times above the normal background count. I hadn't replaced it in...
... This is fairly normal, you're picking up radon decay daughters. They build up and reach equilibrium fairly quickly, in a matter of a few hours. Keeping the...
Hi Chris; Would this indicate a dangerous level of Radon? Should I have this checked? I'm in the St. Louis, missouri area and ihave heard of anecdotal...
The 440's are an example of extreme engineering for sure. They ( or at least some of them) use a vibrating capacitor to remove and concentrate the charge from...
Hi group, Was turned on to this group after seeing Dr. Prutchi's '700 on makezine.com. It initially attracted me because I've been wondering for years what...
Hello and welcome. I will be happy to trade you a used CDV700 by Victoreen, without a probe tube but with a manual for a couple of used milling cutters or any...
It's my understanding that a CDV 700 (and other geiger counters) can be overloaded when expopsed to high radiation levels. Is there a way to desensitize...
There was a kit, made by EON, that reduced the sensitivity ot the 700 by a factor of 10. If you're looking for such high level, you need to move up to an Ion...
Yes a lead shield is a good idea. Make it large enough that you can get inside of it too. If the radiation field is that high, your best bet is use your feet. ...
Much simpler for a 700 possessor would be to add a much smaller gm tube operating at the same voltage but with a different (i.e. smaller) sensitivity factor....
This was a "plug and play kit" - you merely plugged in the tube, stuck the label on the box and suddenly X1 was X10, etc - can get any simpler. (ranges from...
Jim; I don't have a 710 or 720, but I do have the 715. I don't have it calibrated and like you folks said below by the time it starts to indicate radation I...
I agree - all you need to know is that it reads at all - any area that it begins to read in is not an area you want to be, so to me the point is moot. I have...
Actually any highly conductive metal can be used, but the density of steel vs expense of materials is considered optimal. Wrap everthing in foil so that it...
A while ago I walked into a rock shop and asked if they had any radioactive rocks. The prop took me out to the garage and showed me a cardboard box with a...
Hello, I've modified a Java application to connect to a chat/irc (quakenet). If you want to join the chat, join http://www.iberdominio.net/irc/ It can take a...
Hi Spacedad, hard to say, my idea is that it could be Uraninit. Good shaped crystals are very rare. Chemical formular is UO2 meaning that in this crystals you...
I see that Ludlum has a modification for driving the meter to full scale on the model 3 if the thing is in overload. What is the DISADVANTAGE to installing...
I've got a set of these, one charger and three dosimeters. The charger seems to work fine, lights up and you can zero out the dosimeters with the knob. No idea...
Chris, what they're actually worth and what they go for on e-slay are two different things - I've tried repeatedly to get sets for a rational price (you cant...
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