1 Sv 2.4mSv mSv 10mSv 3.2 X Berrington (1) 15 X X 3.2 7587 700 0.6 Berrington ICRP 1990 (2) Sv 0.05 UNSCEAR 2000 (3) 1.2mSv 3000 5 10-2 /Sv 1.2 10-3 Sv/ 1.3 108 7.8 103 7800 Berrington X X 8000 Berrington Yahoo Japan 448 Berrington Berrington 2 Berrington UNSCEAR2000 NLT UNSCEAR ICRP NLT X UNSCEAR2000 I “Epidemiological evaluation of radiation-induced cancer” 1947 ABCC 1950 ABCC 12 LSS: Life Span