$ 946,000 41 STANDARD DEVIATION 30000 811,000 Z— ti STANDARD , 25000 # ERROR 676,000 541,000 20000 405,000 ] 15000 lO000 F 270,000 5000F 135,000 1960 BB 1000 2000 3000 4000 5000 6000 7000 8000 900 0 10000 4 3 li I a 0 TIME PAST REHABITATION, days Figure 4.3 #1. Adult cesium-137 body burden as a function of time since resettlement of Rongelap Island in 1957. The maintenance of the body content depends on the radionuclide intake from the diet. The physical half-life is 30 years; the physiological half-life is 110 days in men, 80 days in women, and less in youths and children. {1 Bequerel = 27 picocuries; 1 nanocurie = 1,000 picocuries) The maintenance of the specific activity of 1 pCi/g in soft tissue for 1 year gives rise to a dose of .0l1 ren. (Figure courtesy of E.T. Lessard, Brookhaven National Laboratory.) TO00b HI 34 Cs-137 BODY BURDEN, pCi é RONGELAP 35000 Cs-137 BODY BURDEN, Bq ’ 6 ' t q t