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 2.GQ Geiger Muller Counter
 Measuring radioactivity of food; GMC-500+
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4 Posts

Posted - 07/22/2018 :  13:21:26  Show Profile  Reply with Quote
One thing is to measure the radiation of the surroundings affecting us. This is perfectly done with a Geiger Counter like the one I have GMC-500+; the results appear in CPM and in S/h.
Quite a different thing is to measure the radioactivity which might be in a probe of food. Usually this is expressed in Becquerel/Kg. The simplest way to do this is to get a Marinelli Beaker large enough to fit your Geiger Counter and, of course, the food sample.
QUESTION: has anybody at this Forum experience in measuring the radioactivity of food samples and if YES, how can you convert the CPM (Counts per Minute) output of a GMC-500+ into Becquerel/Kg? I am perfectly aware that for the measurement of radioactivity of food in fact quite sophisticated equipment is required. But, perhaps, I can get a first approximation by making use of my GMC-500+
Best regards,
Chucho, Germany

Reply #1


946 Posts

Posted - 07/23/2018 :  08:42:41  Show Profile  Reply with Quote
Quick google search gives

1 microsievert / Planck's constant =
1.5091902 10^27 becquerels / kilogram

where Planck's constant = 6.62607004 10^34 m2*kg / s

So you can use the uSv/h to convert it to
becquerels/(kilogram*h)? But I'm not entirely sure about this.

Edited by - EmfDev on 07/23/2018 10:05:39
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