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BROOK HAVEN NATIONAL LABORATORY 4.0s81 1 ASSOCIATED UNIVERSITIES, INC . Biology and Medicine Here are the values for the internally-deposited radionuclides in the Rongelap population as measured in February 1961. The mean CS137 body burden of males and females of exposed and unexposed populations, as determined by whole-body counting, does not differ significantly from the 1959 mean value. The mean 1961 Zn65 body burden was about 1/6 of the value measured in 1959, a rather surprising drop. This year we positively identified Com in this population with a mean level of 0.16 ~c/kg body weight. This was possible because of the improved counting equipment, larger crystal and 30-minute counting time employed. The values for Sr90 in the 24-hour urine samples collected are tentative values, since all the samples have not been analyzed and rechecked. We have a composite 5-gallon sample that is being analyzed a~~ I suspect this will give the best value for the mean level of urinary Sr . To date, on the basis of the individual 24-hour samples analyzed, there is an average increase in urinary Sr90 concentration of 35% compared with the mean value I hope this information will serve for the present. I’m working on the report of the entire set of data and hope to have it soon. Please call on me if there is any further information that you need right now. Medical Physics Division
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Conard offered the equipped to do the suggestion of obtaining a ship with an iron room and sort of work that is now being done at Rongelap on a permanent basis and thus have a floating laboratory ready to go where ever needed. This suggestion was offered The SrgO burden in the 1956 death in unit. Teeth Have been collected for for future consideration rather than the population was 0.8 of a strontium Sr90 determination. Bruner pointed that in order to have comparable data simular parts of the tooth should be used. Most of the Sr90 can be expected in the cemente~’%egion of the d/m/ liter of urine in the following table: 12. 174. Collected 24 days after Bravo. Analyzed 2 years later 2.4 33. Feb. 1956, pre Redwing The following data were presented by Cohn. In 1958 CS137 body burden was 0.5 - 1.5; average 0.8~c?).- About 1 year to reach equilibrium. In 1957, Zn65 body burden at Rongelap by whole body counting 0.03 to 0.07 4C. In 1957, Zn65 body burden at Utirik by whole body counting 0.48 and 0.23. In 1958 Zn65 body burden at Rongelap by whole body counter were 1 to 3pc. The background gamma curves from pre and post Hardtack, showing presence of La in post Hardtack samples, were presented. Some people have La peak, others do not.