wk Bike beet ateSea ND Wat heGSRAIR Blenae elPrtel Daa NOTES 957 i tri SOG - x 200}- \ [4 ToT biota 100: 50 1 BICESIUM/POTASSIUM (pCi/g) 1900 196! —_ 1962 j i963 1964 i 1965 i l 1966 1967 YEARS 1968 A! i969 \ i970) \ !97! Fic. 2. Comparative levels of ®7Cs in a population of United States, U.S.S.R. and Denmark, (A) -~---UL.S.S.R. (see Ref. 8), (B) O—--—©O Les Alamos Laboratory (see Ref. 9). (C) 6 x Denmark (Aarkrog ef al.), (D) @——e Brookhaven National Laboratory. MacDonazp," in Los Angeles, reported that though the recent tests conducted by China and France did not increase the levels of 8?Cs in man, the rate of fall has decreased after 1968.'5) (Also see Fig. 1.} The integral radiation dose from "Cs for the is the only technique capable of supplying a direct and accurate measure of 187Cs body burdens for these populations studies. K. K. SHuKLA C. 8S. Domsrowskt S. H. Coun period from May 1962 to April 1971 was calculated to be 7.75 mrem based on the calculations of LoEvINGER According to Loevinger, the absorbed radiation dose to a 70 kg man with height of 170 cm from B’Cs, would be 0.117 mrem/yr/nCi87Cs and. 0.136 mrem/yr from *#*K/g K. Assuming an average body potassium as 120 g, the integral dose from #°K for the 9 yr period (from May 1962 to April 1971) would be 146.7 mrem. Theradiation dose from 187Cs is therefore only 5.3°% of the dose from °K for the comparable time periods. The maximum dose rate due to "Cs occurred in 1964. At this time RicHMonp'?) reported the radiation dose resulting from 137Cs for man weighing 70 Kg with a height of 170cm as 1.5 mrem/yr. In the present study, this value was found to be 2.1 mrem using the calculations of Lorvincer.'®) At the same time, Sivintsev'®} reported a radiation dose for this year of 6.5 mrem/yr for a 70 Kg male subject in Moscow using the ICRP recommended formula: Dose rate = 11.7 x nCi 137Cs body weight (mrem/yr). While the results of the present study are based ona small sample and cannot be extrapolated directly to the population at large, the pattern of changein !9’Cs levels compares very well with the mean of a population of 900 Brookhaven employees counted at various times during the same period. Whole-body counting Medical Research Center Brookhaven National Laboratory Upton, L.I., New Yerk 11973 References 1. S. H. Conn, E. A. Gusmano and R. A. Love, Nature, Lond. 205, 537 (1965). 2. S. H. Coun, S. W. Lippincott, E, P. GRoNK1TE 3. . . Cn of et ai.) 6. and P. F. ReizensTe1n, Whole-Body Counting, IAEA, Vienna (1962). §. H. Coun, C. S. Domprowsxi, H. R. Pare and Jj. S. Ropertson, Phys. Med. Biol. 14, 645 (1969). I. O. Anverson e? al., AE-119, Stockholm (1963). N.S. Mac Donatp, I. Ban, A. FLesHER and M. Hacxenporg, Nature, Lond. 228, 283 (1970). R. Lorvincer, J. G. Hott and G. J. Hine, Radiation Dosimetry, p. 801, Academic Press, New York (1956). 7. C. R. RicumMonp and J. E. Furcuner, Radiat. Res, 32, 538 (1967). 8. Yu. V. Stvintsev, V. A, KANAREIKIN and O. M. ARUTINOV, Radiobiologiya 6, 822 (1966). 9. E. C. Anperson, R. L. Schucn, W. R. Fisoer and W. Lancuam,Science 125, 1273 (1957). 10. A. Aarxroa, Health Phys, 20, 297 (1971).