66. Setter, L. R.3 “agee, G. R.3 and Straub, C. Fe ATALYSIS OF RAD. OACTIVITY IN SURFACE WATcRS. PRACTICAL LABORATORY METHODS. Presentation at the Seth Annual Meeting of the American Public Healta Association before the Engineere ing and Sanitation, Laboratory, and Occupational Health Sections at Atlantic City, New Jersey. 67. (Nov. 16, Sievert, R. M.3; Gustafsson, S.3 and Sylander, C. G. INCREASE IN y-RADIATION FROM POWDERED MILK AND BEEF. 1953-56. ay 20:. Nature 178, 85-5 (1956). Samples of powdered milk and beef preserved during the years 1953 to 1956 were examined for the presence of y-radiation. The higher yeradiation found in the last year was attributed to an increase in fission products. Data are compared with measurements on a series of children. 68. Smirnov, N. S. ON THE EFFECTS OF ATOLIC EXPLOSIONS ON THE CONDITIONS -IN THE ATL.OSPHERE. IzvestiyaAkademiiNauSoyuza SovelskikhSotsiaristicheskikhRespublis. neriya Fizicheskava- 1227-31 (195 In Russian). Effects of atomic bomb explosions on the increase in the atmospheric radioactivity and its influence on the weather has been reviewed. 69. Stanley, Charles W. and Kruger, Paul DETERMINATION OF Sr 90 ACTIVITY IN WATER ION-iXCHANGE CONCuiTRATION. Nucleonics 14, 114-18 (Nov. 1956). It appears that sr?? Can be used as a measure of the fission product contamination of water. f very Sensitive netrod of wuter analysis of sr9O . 0 using ion exgnange concer.tration with selective Lowelevel techniques elution of Y 5 is dascrihed. are exployed to coups, the ¥90 which reflects the Twenty-six liters of city concentration of Sr’”’. found to contuin tap water were copcer.trated ane, 3.10 + 0.21 x 10-* dpm/al of SE? . %If interferring activities are presert, the sr7© can be eluted and radiochenical separation yserformed.