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 2.GQ Geiger Muller Counter
 Background over water
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438 Posts

Posted - 09/01/2017 :  08:00:22  Show Profile  Reply with Quote
Just returned from a little bit of sailing on a bigger inland body of water, and kept my Geiger counter below deck with history saving every minute. Here is the result (readout with GeigerLog):

Image Insert:

55262 bytes

When on land the background is CPM=19.4, while over water is is only CPM=13.3. The altitude of the water is at sea level (actually, 1 foot below), while the land is at ~80m. So, the reduced background over water could be influenced a little bit from reduced cosmic rays, but I think the majority is due to the lack of nearby soil, rocks and building materials when on a boat consisting mostly of plastic, wood, aluminum and steel.

As the instrument background is specified by GQ as "<0,2pulses/s", equivalent to CPM=<12, almost all residual background might be originating from the instrument, and almost nothing from cosmic rays.

Though the "<" sign could mean anything from an instrument background of 0 to 12.
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1255 Posts

Posted - 09/30/2017 :  21:28:32  Show Profile  Reply with Quote
Good information.
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