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 2.GQ Geiger Muller Counter
 GMC-320 Plus vs Victoreen 190 survey meter

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T O P I C    R E V I E W
Petrovski Posted - 04/06/2016 : 09:42:17
Today I decided to do a quick measurement of the check source of a Victoreen 190 (which I have available at work) with both the Victoreen itself and my new GMC-320 Plus. The Victoreen is professionally calibrated every year.

The Victoreen 190 with pancake probe:
Image Insert:

73775 bytes

Check source details:
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132219 bytes

Check source location (on top of the survey meter):
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80834 bytes

Measurement with the Victoreen (set to CPM):
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87105 bytes

Measurement with the GMC-320 Plus:
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88316 bytes

I only measured for a couple of minutes, but you can clearly see the Victoreen registers roughly 4 times the amount of counts than the 320 Plus. Since the check source is a Cs-137 source which emits beta radiation of 0.5 and 1.1 MeV + gamma radiation of 0.6 MeV (emitted by the decay of Ba-137) and all these radiation types & energies are well within the detection range of the M4011 GM tube, I imagine the difference is mostly caused by the fact the pancake probe has a larger surface and is more sensitive than the M4011 tube of the 320 Plus. And of course, the Victoreen is about 15 times more expensive. It only needs a few seconds to stabilize at ~1500 CPM.

Anyway, just a 'fun' comparison. In the near future I'll do some measurements of a Cobalt 60 source and also compare the 320 Plus with a Berthold contamination monitor.
3   L A T E S T    R E P L I E S    (Newest First)
Setagaya-Observer Posted - 04/11/2016 : 01:54:51

Radium D and Radium E

Radium D and radium E are the historical names that Ernest Rutherford used for lead-210 (Ra D) which has a 22 year half-life, and bismuth-210 (Ra E) which has a 5 day half-life. Since lead-210 and bismuth-210 are always accompanied by polonium-210, which Rutherford called radium F, such a source is almost always described as Ra DEF. It is possible that the manuals only refer to Ra D and E because the alpha particles emitted by the Ra F cannot be detected by the probe. On the other hand, the beta particles from RaD could not be detected either because they are of too low an energy. A Ra DEF source emits two beta particles for every alpha particle. In addition to the beta and alpha particles, the Ra DEF source also emits a 46 keV gamma ray in 4% of its decays.

Source; https://www.orau.org/ptp/collection/civildefense/checksources.htm

I hope this is answering your curiosity.

Regards, your Instrument from Work is a nice one!

Edit; i made a mistake regarding your Test Source, sumimasen o kudasai, here is the correct Info;
https://www.elimpex.com/products/survey-meter/victoreenprobes1.pdf
Petrovski Posted - 04/07/2016 : 10:22:04
Good point. The plastic does block most of the GM tube. Will try.
Distelzombie Posted - 04/07/2016 : 03:49:56
Not exactly.
Try the same again but this time open the case of the 320. The plastic is so thick it blocks much of low power beta radiation.

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