OFPICTAL USE ONLY | | . ~ dinease, and the present levels ere aot considered to represent a serious comiition. "Realdual changes tn the akin from the deta irradiation continue to show tuprovement. Piguat | are etili ecarring ocuiar leions ig siniler i emposed and control populations. “fue radiochemical analysis of the urine of the Rongelap people shows measurable antivity waich is largely duc to ceriume-1+4prasecdyniimei}4 with only alight activity Goa to strontiun-3. The body burden of these tactepes is estimted to be well telox the permissible levels. Zxeminetion of bone specinents in the case of the ons wen who died abo po rediztion that can be derinitely associated with fallout deposition in the bas. Studics of radiceraphe of the fosmrs of the exposed children shov no evidence oftiny bone defects from poasible deposita of radionmciides.” B. External GameDose Rates on RongelayAtoll. 7. Me extern] gamdose rates at three feet above the gromi on the Island of Rongelep are shown in Graph One. Tt aight be expected that this curve wiil flatten out with time due to the dosinmance of the 33 year half-life cesium-137. The latest survey af Rongeliap Inland at the end of July 1956 showed a renge of woluse from 0.2 - 0.5 millireentgens per hour, with an average of G.% ax/hr.° Graph One suggests an anticipeted © dose rate at the time of the survey to be about 0.1 ar/hr. The higher vain foundis undoubtedlydue to the small a@@itional fallout that occurred during Operation Redwing. Since this is relatively fresh ~ 5002041 6 «