On my flight today, I was chatting with a fellow who worked on CO2 lasers– since I happen to have my USB Radiation detector I figured this would be a good opportunity to detect the http://en.wikipedia.org/wiki/Cosmic_ray
">Cosmic rays coming in to the plane with interested parties. It worked (photo here). The detector picked up 80, 120 and 240 Muon Count Rate (cpm). I haven’t dumped all the data and looked it up yet- seems harmless of course, but it was really neat to detect stuff while high above the clouds at 20,000 feet. When I get time, I’ll map the data with GPS, Sat photos and altitude- kinda like war driving for radiation.