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 RnL06, during this time are mgligible. Since fission product samples contain many nuclides contributing to the total beta activity of the sample, each of which has its own erergy 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 Station andCollection Days After Range Time Interval T 1 1 1 How How How How ? =i hr ¢7 ihr -lhr $1 9 50 73 102 "780 1270 1180 1180 Le? 24 204 204 1 1 1 1 1 1 1 3 How How. Nan Nan Nan Nan Nan Uncle 2- 2hr 2 - 24 hr 1-14 hr 1-14 hr 1-14 9 l-lr 1-1¢ hr 0-4 hr 15 25 9 15 25 73 101 4 820 1080 780 840 1040 1120 1200 940 1.8 202 1.7 1.8 22 203 205 20 1 4 3238 How How Shot 2 <- 2h hr (mg/em?) Ener Shot 9 $-l1hr 16 780 + 800 (Mew) 1.7 1.7 GAMMA ENERGY SPECTRUM The gamma energy and decay spectrum of a ground sample picked up at George after Shot 4 was investigated with a scintillation spectrometer. Individual isotopes were identified where possible and their activities corrected back to the time of detonation. Work similar to that done here has been carried out for previous operations by Bouquet 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 radioactivity, a quantitative measure of the amount of the nuclide of gamma ray present in any sample can be madee 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 subtractede This subtraction exposed the next mst energetic photopeak to the same treatment and the cycle was repeated. 75