The for U°39 a 239 were derived as in Eqe 3.9. The ratio of ys activity to Toa)activity, 0.0007, was determined in this case by a solution of simultaneous equations using actual decay curves because capture to fission ratios were unayajlable for this shot. Eowever, because of its short half-life, U similarly. cannot be calculated The fission activity component wast Age Ayptts3 (3.15) where the exponent was cetermined from decay data after 2000 hr. A few decay determinations from early-interval samples of Easy, Fox, and George show that a high percentage of activity origina-~ ted prior to Shot 3, probably from Shot 1. samples follows the relationship: The decay from these A=A(t #998) (3016) where 998 hr is the time elapsed between Shots 1 and 3 and n is the Shot 1 decay exponent during this period. The activity values from the first two 30=nin intervals and the first 5-min interval were extrapolated to sampling time oy Eqe 3.16. All other activities were extrapolated using Eq. 3.14 and 3.15. Shot 3 decay axponents are listed in Table 3.4. A typical decay curve is shown in Fig. 3.2. 30304 Shot 4 The activities of Shot 4 samples were corrected to sampling time by the relations A = Ayt~le4 (3.17) where 1.4 is the average of the Shot 4 decay exponents. The decay curves for this shot are more nearly straight lines on log-log paper than the curves from Shots 1 and 3, indicating that the neutron capture activities in samples from Shot 4 are small or absent; therefore, no corrections were made for these neutron capture activities. Shot 4 decay values are shcwn in Table 3.4 and a typical curve is illustrated in Fige Bede 30305 Shot Shot 6 activities were corrected to sampling time by the relationships A = Ayt 1 (3 18) The curves show little or no neutron capture activity and no correction was made for neutron capture activities. The value of -1.2 is the average of Shot 6 decays. Values of individual samples are shown in Tables 3.4 and a representative decay curve is illustrated in Fige Bebe 44