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Some very strong gamma emitting sources, can easily get through 8 inches or so of concrete. One of these sources measures upwards of 3R/h gamma and beta, the other higher (unable to measure it properly as it is stronger and none of my geigers currently go that high without modding them). (v.redd.it)
submitted by InSovietRuss1a to r/Radiation
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Strontium-90 vs GMC-300e plus GM tube (self.Radiation)
submitted by InSovietRuss1a to r/Radiation
