eo! -stm te eee eee es -~ -_— 7. ome Se aE 00 bo ae oe eh ee UNCLASSIFIE 9, WHAT IS THE EFFICIENCY OF THE GUMMED PAPERS IN SEPARATING P yROM RAL? eeee eS a 7 Method of Study 7 1| Principal Pindin ba | Suspensions of radio- ‘ as ve iron were . ee oratory and artificial yain produced under cles less than .3 AI. Data for less s fall rates are no f as yet available, various conditions of fectiveness of the Wm > YA ddl gumzed papers in sepa- tating the iron particles from the "rain" was determined. 3, 10 WHAT EXTENT IS THERE VARIABILITY Is THE FRACTIONS OF Sr5? AMD $90 IN BOMB DEBRIS? Method of Stud . Samples of fallout ard atmospheric dust from m various bursta were m analyzed for total activ- ity and the two isotopes " of Sr. Principal Findings Fallout dusing the weeks immediately a burst is deficient in both stronti Samples of out and airborne towards the end of 1953, at which t to have been the principal contritte in both isotopes. In some samples the measured Sr59-90 theoretical by an order of magnitude, cases by less than a factor of two, deviated from 00131986.00 1057034