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Radioactivity levels in 137 foods commonly consumed daily in Japan were evaluated to determine the committed effective dose in the Japanese adults. The levels of radioactivity for ^<238>U, ^<232>Th, ^<226>Ra, ^<210>Pb, ^<210>Po, ^<90>Sr, ^<137>Cs and ^<239+240>Pu were ND-5.2Bq/kg fresh weight, ND-0.18Bq/kg fresh weight, ND-3.9Bq/kg fresh weight, ND-45Bq/kg fresh weight, ND-120Bq/kg fresh weight, ND-9.9Bq/kg fresh weight, ND-19Bq/kg fresh weight and ND-0.010Bq/kg fresh weight, respectively. The committed effective dose was estimated to be 0.80mSv from the intake of the foods. The effective dose was greater than the world mean value for adults of 0.12mSv by natural radioactive elements in the uranium and thorium series from the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR) 2000 because of the large contribution from ^<210>Po in seafood.