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The point here might be how much 'natural radiation' from polonium exist?
- 1950’s, average background radiation went > 1 mSv (max. public limit for radiation exposure)- 1960's, Due to 2,400 open air atomic bomb tests radioactive fallout, > 2 mSv - 1994, average background radiation, Chernobyl, TMI, other accidents and dumping; > 3 mSv- 2002, average background radiation, more accidents, spills, ocean/air dumping > 3.6 mSv- 2014, average background radiation, Fukushima mega disaster and more dumping > 6.2 mSv (max. limit for public has been raised 600%)…the average annual radiation dose per person in the U.S. is 620 millirem (6.2 milliSieverts)."