Solving Eq. 5.4 with the data from Table 5.5 for shelves 1, 2, and 3 gave the values of the constants in Bq. 5.2. Hence, R° a R + 2,920 x 1076R2 + 1,388 x 10710R3.6,733 = 107164 (5.5) Equation 5.5 may be expressed as, (5.6) RoR a lt+y in which y/R = 2.820 x 10-64 1.388 x 107)R-6.738 x 10°14? (5.7) These equations give an effective dead time of 200 ;,sec at about 4000 c/a, The value of y for each observed sample and background count was read from a plot of y against R. From+ 1.5 days, + 5 days, the sample was observed on a gas-flow counter at the site and from + 9 days it was counted at USNRDL on other gas-flow counters, The ionization and beta check well from about 0.4 to 10 days; at earlier times the ionisation decay was somewhat faster. Calculated beta decay curves for Shots 1 and 4 are plotted in Fig. 5.4. The decay of the induced activities for Shot 4 are included. The calculations were based on capture to fission ratiosd// and on the fission product d/m for 10,000 fissions at sero time, The experimental beta decay for Shot 4 are superimposed on the plots by normalizing the 10-day values. Agreement between the observed and calculated curves is fair. The induced activities cease to effect the zroas decay at + 60 days. The calculated decay curves exhibit some differences in the mode of decay between the radicactivities produced by Shots 1 and 2 for times less than + 60 days. The observed curves are all somewhat steeper at + 60 days and longer. The gamma decay of samples from Shots 2 and 4 at times shorter than + 10 days are different. Unfortunate . only single samples were available for the early time decay for those two . cases; and, further, the decays were observed on counters having different; spectral responses, Hence there is no basis for determining the real significance, if any, of the differences, The ionization and gamma cout, < decay could not be expected to agree with the calculated curves as closely as the beta decay; however, their divergence generally was not great for © short intervals of time. 51.3 Spectrometer Since the gamma analyser was converted from an alpha analyser efteqD Shot 1, it was not available for early measurements on fallout samples frp that shot. Gamma spectra were taken of gross decay samples from Shots sy. 2 to 4 at various tines after detonation, The results are sumerised iC: ; Tables 5.6 through 5.9. In these tables the heights of the various Z ™ 0.1 nearest peaks energy the for one of value a are shown relative to Since a small Ral crystal was used, the spectra were linited to : the lower energy region and the peak at about 0.5 Mev was undoubtedly contributed to by annihilation radiation from gammas of higher energy than 1 Mev, However, the data were used minly to compare the general 112