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jbdavi211
USA
21 Posts |
 Posted - 08/16/2012 : 14:05:05
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Hello, has anyone seen a test sample like this one, (photo) I obtained it with a uranium rock in a wooden case with an old Geiger counter.
it has either .16 or 16. scribed on the back (photo) See my snips of the GQ software counter
I also did a test run with my new GMC-080 kit with a Russian CBM-20 tube, I know it dates back to the early 1970s as I purchased it from "Electroman" Electronics in a Geiger counter. It "was" (electronics fried) virtually identical with a Russian "Master-1" dosimeter.
By the way the GMC-080 Kit works great with that old Geiger Tube (CBM-20)
Any ideas or input?
J
Thanks
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| Reply #1
ZLM
1271 Posts |
Posted - 08/20/2012 : 15:45:29
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| Good job! |
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| Reply #2
MVB
USA
1 Posts |
Posted - 09/18/2012 : 14:45:41
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I have a check source that looks almost the same as yours. Mine also came with a geiger counter that I bought on eBay. The one I got was a "Precision Radiation Instruments Model 107C 'Professional' Geiger Counter." Not only was the check source included, so was the instruction manual. The manual, which also has a section on prospecting for Uranium, has detail on the check source. The number is in milliroentgens, and what looks like a dot is not a decimal point. (I think the "dot" is there to indicate which way to read the numbers -- on your sample it is obvious, but mine is 9 which looks like a 6 if you don't know which way 'up' is on the sample disc.) My source does seem to read about 9 or 10 milliroentgen on my CD V-700, so there has been no appreciable degradation since it was made in 1953. I suspect that it is Uranium, since the counter was intended for prospecting. I keep my sample in a metal can, since it is quite a bit "hotter" than the 2.5 mR check source on the CD V-700 case... Your sample is even stronger, so treat it carefully.
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| Reply #3
jbdavi211
USA
21 Posts |
Posted - 09/21/2012 : 07:27:58
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Thank you for the information. For the record, I keep the sample wrapped in lead foil. I will do some Time & Distance readings to show the rate of falloff over distance and post later.
Thanks again
J |
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50s Era Test Sample
