rememTTa get be were 1? Irene Boone, Sam Rothermel, Verda Stranr, Phyllis Sanders, Jake Spalding, Bill Moss, Bill Schweitzer and Donald Ott): The results are summarized as follows: a. Three groups of urine samples were examined: I, Four pools, 3 from natives on Rongelap and one from American Air Force personnel on Rongerik and Eniwetok, (also a number of individual samples from this last group), all collected on 3/16 to 3/19. II, Four pools from natives on Ailinginae and on Rongerik, Air Force personnel on Rongerik, and medical personnel on Kawjalein, all collected on 4/13 to 4/16. III. Three pools from Japanese fishermen on the Fortunate Dragon collected on 3/28, 4/14, and 4/19. b. ¥ Total beta activity was determined on dried urine samples and total nonvolatile beta activity on dry-ashed and wet-ashed residues, Dried urine gave decay rates of 8 days from 3/25 until about 4/20 showing I 131 to be the principal isotope present, and of 55 days from 4/20 through 8/1 showing sr®9 to be the predominant isotope during this period. The total Sr mentioned data. 89 content of the urine can be estimated from the above All of them give 0,01 to 0.02 pc/l or 0.005 to 0.01 we/24 hr, Using the same assumption as for I 131 the body burden on 3/16 may be estimated as 10 Ke of sr89, If the ratio of Sr” to sr8? is 0.1, the Sr“ 90 body burden was about 1 pic. The total beta activity values for the other groups were much lower; the relative activities of sr&9 can be seen from the table of counting rates for 100 ml aliquots of urines courted within, amegie te PS U. rer(Sorloy by MMnclee at.J i, R.D. Avs “ che peng (Date) mat! Ack (eiage7B Cf/ 2b (Signsture of person making tbe change, and date) (