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December 16, 2014 at 9:06 am
#956
richardp61Participant
Another observation that may be relevant here, and which is the converse of your ‘under water’ experiment Craig, is the way that GM count rates increase with altitude. Many of us have taken GM based detectors on commercial airplanes and have found that the observed rates are around 20x sea level BG. Clearly this is a result of extraterrestrial particle flux (muons and secondary particle showers) so obvious GM tubes are responding to them.