Radiation dose limits
Occupational exposure, Adult, annual                     50 mSv/y            5 rem/y
Occupational exposure, Adult, life time                   250 mSv/life       25 rem/life
Occupational exposure, Fetus and age<18-year     5 mSv/y              0.5 rem/y
Public                                                                    1 mSv/y              0.1 rem/y
Public                                                                    0.02 mSv/h         2 mrem/h