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 1.Geiger Counter World Map(www.GMCmap.com)
 uSv/h instead of CPM on the map
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shell

5 Posts

Posted - 06/29/2023 :  00:17:26  Show Profile  Reply with Quote
Hello!

My idea: is there way to change information on the map from CPM into uSv/h? CPM is "device depended" - in the same condition it depends of the device, tube, sensitivity etc. uSv/h are more convinient to use and more science-valued than raw CPM.
Regards!
Reply #1

ullix

Germany
1107 Posts

Posted - 06/29/2023 :  03:58:09  Show Profile  Reply with Quote
You introduced yourself as a newcomer, and obviously were able to immediately see the flaw in this construct: when you post data from different devices, or different tubes, any "CPM" (or "CPS") is inadequate for comparison; only ÁSv/h will do!

But then there is another catch: the conversion from CPM to ÁSv/h is valid ONLYfor a gamma source, and only one which is close to the source, by which the device had been calibrated for.

Now, as the GMC counters have never been calibrated, you are free to do whatever you like ;-))

Measuring background may pass as an acceptable spectrum pattern to the spectrum used for calibration, but if any source has a strong beta component, any report in units of ÁSv/h is invalid, as this has never even been claimed to be used for calibration!
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Reply #2

shell

5 Posts

Posted - 06/29/2023 :  05:16:58  Show Profile  Reply with Quote
OK, thanks for answer!

But anyway, ÁSv/h gives kind of information about radiation level, which is converted from lamp pulses. Different lamps has different sensitivity, but using conversion formulas it returns less or more comparable values. And CPM never will be comparable :-)
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