respectively.) The increasing contribution of Pri44 is reflected in the increase of the maximum energies shown in the tables. Contributions of higher erergy isotopes, such as Rhi06, during this time are megligible. Since fission product samples contain many nuclides contributing to the total beta activity of the sample, each of which has its own ensrgy spectrum associated with it, no conclusions should be drawn from these data as to the average beta energies of these samples. TABLE 3.9 ~ Beta Range Measurements Shot Station and Collection Time Interval “T How 1 How 1 1 1 1 1 1 1 1 1 1 3 4 323 How How How How How Nan Nan Nan Nan Nan Uncle How |Days After Shot ¢ - ihr Range (mg/em@) 9g 27 1 hr 4. 1hr $-l1hr 2 - 24 hr 2- 28 hr 1-14hr 1-14 hr 1-1 br l1-ier 1-1 hr 0-3 hr 1.7 780 1.7 1080 780 840 1040 1120 1200 940 242 1.7 1.3 202 2.3 2.5 2.0 1170 1180 1180 15 820 25 9 15 25 73 102 14 4-1 hr 780 50 73 102 9 2- 28 hr 16 | "Ener (Mev B00 24 204 24 1.8 1.7 GAMMA ENERGY SPECTRUM The gamma erergy and decay spectrum of a ground sample picked up at George after Shot 4 was investigated with a scintillation spectro~ meter. Individual isotopes were identified where possible and their activities corrected back to the time of detonatione Work similar to that dom here has been carried out for previous operations by Bouguet et al. 16/ The method assigned the most energetic photopeak to a specific nuclide or gamma ray for which a standard spectrum was available or could be estimated. Since the area under the vhotopeak is directly proportional to the intensity of the radio~ activity, a quantitative measure of the amount of the ruclide of gamma ray present in any sample can be made. By normalizing the standard spectrum of the assigned nuclide or gamma ray to the intensity ob- served in the fallout sample, its contribution to the total sample spectrum was subtracted. This subtraction exposed the next mst energetic photopeak to the same treatment and the cycle was repeated. 75