13 Nov '11, 3am

ラドン濃度に関する勧告が出たのは1988だとある。1988年にまさにデンバーに住んでた俺は盛大にラドン吸ってた可能性が否定できない。http://t.co/ETfg9WF5

ラドン濃度に関する勧告が出たのは1988だとある。1988年にまさにデンバーに住んでた俺は盛大にラドン吸ってた可能性が否定できない。http://t.co/ETfg9WF5

The German chemist Friedrich E. Dorn discovered radon-222 in 1900, and called it radium emanation. However, a scarcer isotope, radon-220, was actually observed first, in 1899, by the British scientist, R.B. Owens, and the New Zealand scientist, Ernest Rutherford. The medical community nationwide became aware of the possible extent of a radon problem in 1984. That year a nuclear plant worker in Pennsylvania discovered radioactivity on his clothing while exiting his place of work through the radiation detectors. The source of the radiation was determined to be radon decay products on his clothing originating from his home.

Full article: http://www.epa.gov/radiation/radionuclides/radon.html#rec...

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