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 1.Geiger Counter World Map(www.GMCmap.com)
 Average Monthly CPM Trend

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T O P I C    R E V I E W
Phildel Posted - 04/07/2023 : 15:58:18
I extracted and averaged 1min CPM counts from my GMC500 and plotted them Feb2019 to Mar2023 of Sunbury Australia.

The detector has never been re-calibrated and I was wondering if my 2019/20 upward drift was the device or was there a general increase in background CPM.

Interestingly Jan22 and Jan23 show a significant dip (summertime).

Any observations welcome and any idea where to get the device re-calibrated in Australia?

2   L A T E S T    R E P L I E S    (Newest First)
igel Posted - 04/23/2023 : 01:37:47



GBG12 Posted - 04/10/2023 : 18:02:55
Some of the gamma logging sites in the USA run by their federal Environment Protection Agency (EPA) show a similar seasonal variation. It's hard to pin down a definite reason, but soil saturation makes sense. Surface radiation is a combination of sky source (what's left of solar and cosmic after being altered by the atmosphere) and ground-source (from rocks and Radon gas seeping up). Rain or snow can seasonally saturate the soils, blocking Radon seepage. Were Jan 2022 and Jan 2023 higher precipitation times in Sunbury?

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