Radiation Units

Japanese TV, which you can watch live via a link on CNN.com, expresses radiation levels in microsieverts. When working we used REM or millirem – mrem.
1 millirem (mrem) = 10 microsievert (µSv)
1 rem (rem) = 10 millisievert (mSv)
1 rem = 1000 mrem

Health physicists generally agree on limiting a person’s exposure beyond background radiation to about 100 mrem per year from all sources. Exceptions are occupational, medical or accidental exposures. (Medical X-rays generally deliver less than 10 mrem). EPA and other regulatory agencies generally limit exposures from specific source to the public to levels well under 100 mrem. This is far below the exposure levels that cause acute health effects.

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