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Re: Kr-85 -Reply



Look again, Pete.  It is Kr-85m that has a 4.48 hour half life.  Kr-85  ha a half life of 10.73
years so that which is released from nuclear power plants, nuclear weapons, etc. remains in
the atmosphere for some time.  It is a relatively innocuous radionuclide, but exeeding the DOT
2 nCi/gm criterion is quite possible.

Charlie Willis
caw@nrc.gov