Table 1

Radiation exposure dose of workers at Fukushima Dai-ichi nuclear power plant, Japan, from March to May 2011

MarchAprilMay
External exposureInternal exposureTotal exposureExternal exposureInternal exposureTotal exposureExternal exposureInternal exposureTotal exposure
Radiation exposed(mSv)
 ≥250056000000
 200–249012000000
 150–1999114000000
 100–14928577000000
 50–9916378309203000
 20–494212608595618118019
 10–198836661041276193101311144
 <10224127261434328635883214288130162854
 Total374537423742362036083608303030173017
Maximum exposure (mSv)199.4590.0670.465.941.869.341.610.141.6