Cohn, Robertson, Conard burden of Sr®* for exposed Rongelap people in 1958 was estimated to be approximately 2 myc or about 9 per cent of the calculated cquilbrium value of 23 muc. The body burden at equilibnum for Cs!57 was estimated to be 1.3 uc (Woodward et al, 1959) (table 7), or about one-half of the ICRP MIPC for non-ndustnal populations. This valuc, however, is too high, since the 1959 Cs13" body burdens appeared to have already leveled off. Preliminary analvsis of the 1959 whole-body counting data indicates that the Cs!8* levels had dropped slightly (0.53 uc) as compared with the 1955 values (Cohn. 1959), STRONTIUM 9° EXCRETION (i fic /LITER) However, it 1s possible that the Cs?%* intake is less than estimated, since much of the Rongelap food is unported and of lower Cs!57 content. i bt ! ba Io C C r ti/2. aw 500 DAYS t1/2 so pars ae 04 tL 0 t 300 1 I l I 600 1 \ 900 4 l i 1200 TIME iN DAYS Ficure 4. Strontium” excretion in urine of exposed Rongelap people (from Wood. ward et al, 1959). 324 Suiz a4