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  • kdtroxel posted an update 9 months, 2 weeks ago

    “Took my rad meter with me on the flight to and from Hawaii, Big Island & Iowa, saw consistent readings both ways, 2,000 cpm over America mainland at 45k feet and 750 cpm over the ocean at 45k ft. using GM GMC300 Geiger Muller Counter. Ground readings vary from 8 to 20cpm. Have never seen a ground hot spot, naturally.” – kdtroxel (my personal observation, return date 1/1/2019)