13 The calculations agree with the rather imprecise measurements for all the data from tower shots except for shots Ray and Met. The measurements on fallout from balloon shots are lower than the calculated figures by a factor of about five to eight. There is no single nuclide of the peak fission products or major activation product that can produce such a result. Therefore, I conclude that the counting samples used to measure uCi/me from all balloon shots contained only about 20% of the amount of radionuclides that should have been present, and, consequent ly, the samples are not representative of the surface deposit. FRACTIONATION OF TOWER SHOT DEBRIS Fallout collected from four tower shots in 1957 was sorted into particle size fractions by wet sieving (La66). Before radiochemical analysis, the heta disintegration rate for each fraction was determined for 8920.5, 9ly 7, 103,106p,, 136¢, 140, and 141,144 04, The results for each size fraction were reported as percentage of the total beta activity in that size cut due to each nuclide, but the fraction of the total beta activity of each size cut _was not reported in La66. Therefore, these published data could not be used for comparison with calculations of the radionuclide composition of undisturbed fallout. The original data sheets were recently made available by the Nevada Operations Office of the Department of Energy. I synthesized the radionuclide composition measured for each undisturbed fallout sample from the information in these data sheets