Table 2—-COMPARISON OF MONTHLY COLLECTIONS OF Sr?° BY FUNNEL UNITS Average mc/sq. mi Month A* Bt July August September 0.34 0.44 0.43 0.55 0.39 October November December 0.34 0.41 0.62 0.41 0.42 0.57 *Funnel collector plus ion~exchange resins andfilter pulp. , tf Funnel collector, no filtering media. gives the Sr® results obtained by chemical analyses of the ash. The data are also in good agreement. 6 LOCATION OF FISSION PRODUCTS Owing to the solubility of some of the isotopes in water, there is a separation inherent in the collection system. Analysis shows that cerium and other rare earths are principally located in the filter pulp. During the period of observation, the mean insoluble fraction was 43 per cent. Zirconium, niobium, and ruthenium are found in the anion exchanger; cesium, barium, and strontium are found in the cation exchanger. During the later months of 1957, some (<10 per cent) strontium activity was found in the paper pulp. 7 SUMMARY The funnel and resin column method of collecting fallout is equivalent to the other systems presently in use although it is impossible to make comparisons with an absolute collector. The convenience of operation by untrained personnel at remote sites is a considerable improvement over present methods which require laboratory facilities for preparation of the sample prior to shipping. The saving in cost and radiochemical effort by use of a central processing facility is apparent since any site collects only one or two samples per month. ACKNOWLEDGMENTS Acknowledgments are due to the HASL personnel, in particular Doris Sutton, Robert Morse, Ira Cohen, and William Collins, Jr., for their assistance in this development. REFERENCES m GC ho be . G. H. Hamada and E. P. Hardy, Jr., USAEC Report HASL-33, Apr. 7, 1958. M. Eisenbud and J. H. Harley, Science 124: (3215) 251-255 (1957). B. Aler and K. Edvarson, Report to the United Nations, A/AC.82/R.52, Apr. 17, 1957. . J. H. Harley and I. B. Whitney, Manual of Standard Procedures, USAEC Report NYO4700. 359