an estimated body burden of 6.9 muC as com- pared to 6.0 muC estimatedin 1959. Wide variation was found in the individual *24hour” urine samples collected and analyzed individually (Table 18). The average Sr“ excreted was 159 wuC Sr” ’g Ca tor the children as com- Table 18 Urinary Sr" Values in Marshallese. 1961 Subject No. sr", uuC | Ca, g,| Sr uu pared to 30.9 for the mean adult population. Adult women appeared to have higher Sr” Ca ratios than men. However. in terms of urinary Sr'' (upC 1), the value was 2.3 for women com- pared to +.5 for men. This difference was similar to that observed in 1959. With the small sample size and the wide spread in values in anvsingle group, it is not possible to detect anysignificant difference between the exposed and unexposed Rongelap Exposed Maies, Age 1-13 (No Females) 23 24) bu 32.3 U.6 6.8 3.3 0.150 0.028 0.05-4 U.O12 Jib a) lly 36 3.6 0.044 127 9.8 0.038 14a Males. Age >> 15 +0 11.6 4.0 27 t 3.8 7 1.+ 0.440 O.149 O.193 0.208 ah ah WI ny 0.3 7 429 0.098 ” : 4.5 0.253 2. Females. Age >15 45 Rs) 0.028 ty 4 47 Av Rongelap groups. Two coconut crabs were brought back from the survey and analyzed for Sr’’. One from Rongelap Island had a level of 1140 (= 12) upSr g Ca, and one from the more heavily exposed island of Eniaetok, 8 miles north, had a level of 3900 ( 23) upC Sr'g Ca. These values were about halfthose found in these crabs in the early vears after the fallout. One 3-month fetus, the product of a miscarriage ina Rongelap woman, wasalso analyzed and showed level of 25 (20) puC Sr°", g Ca. How- ever, the sample was so small that the results are oflittle significance.* Figure 58 showsthe levels of radionuclides in the Rongelap people at various times after expo- 40) 41 Av 59 2.0 QO.101 14 66 12 +7 0.7 0.063 0.043 |: 2.3 0.059 bi Av Rongelap Unexposed sure, based on radiochemical urine analyses and spectrographic determinations. DISCUSSION It is interesting that no significant differences were observed in the body burdens of the four gamma-emitting radioisotopes measured in the 1961 whole-body spectrographic study between the groups of Marshallese exposed to fallout in the 195+ accident and unexposed groups who have been living in the same environmentfor the last 4 years. The original contamination of these gamma emitters in the exposed population has already been eliminated, and what is observed in this studyis the radioactivity derived from theslightly contaminated environment. *We wish to thank Mr. E.P. Hardy. Jr.. Health and Safety Laboratory, New York Operations Office. AEC, for carrving out these Sr’ anaivses. wi Males, Age 1-15 (No Females} 822 2.6 Males. Age >15 (No Females) 944 L.4 838 3.3 838 3.1 Av 2.7 0.030 Aa 0.182 0.210 m rs 0.202 - 0.215 Lt Analyses of Pooled Specimen (20.8 |) Sample Se’, wu,| Ca, mg/l Sr", uu | 7.2 145 qui 2 3 6.4 6.8 149 142 Fal tin 6 8.3 4 3 Av 7.2 7.0 141 131 Wh 344 7.20.4 14144 BO 139 out