35000} T Tr T T T T T T T RONGELAP T T T 4 946,000 £1 STANDARD 4 311,000 0 DEVIATION ¥ +1 STANDARD ® 30000 | = a 25000K + 676, 0 ERROR a > 20000} 4 541,000 oO ° ts a © 15000 b 4 405,000 r 100004 4 270,000 5000 O 3 i 4+ 135,000 ° i i i z | ) i Z l i 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 TIME PAST REHABITATION, days Figure 4.3 #1. 0 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 sen, 80 days in women, and less in youths and children. (1 Bequerel = 27 picocuries; l 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 .01 ren. (Figure courtesy of E.T. Lessard, Brookhaven National Laboratory.) 34 Cs-137 BODY BURDEN, pCi T