This photo proves the theory that when we go to higher altitudes, cosmic background radiation increases. Normal background radiation in my home in Chiangmai city, Thailand (320m ASL) is around 22 CPM (counts per minute) whereas the cosmic background radiation at Doi Pui Hmong Village (1500m ASL) seems to be around 34 CPM (see photo above). This... Continue Reading →
I bought myself a Uranium glass ball on EBay as a radioactive source for testing my Geiger counter. Uranium glass isn't really dangerous and was used for its decorative qualities in the 1950's. It has the property of fluorescing bright green when illuminated with UV light.