0018933 are calculatedfrom R-values averaged fromthe particulats sonples tal:en in thz main cloud on the same aircraft as the gas samples.e . tte /The fractions for Oak are also trom averages, here in the light and variable stratum, while for Walnut the stabilized condition shown in Figure 3,1 is used, Sample 980 L for Oak is not included due to the poor sampling conditions. | The fractions of these nuclides remaining in the cloud after one day are given in Table 3, 2. These numbers are to be interpreted as the quan- tity of material which does not come downin the local area, The limits assigned are derived from the variability in the data, TABLE 3.2 -. PERCENT .-.- @& NUCLIDES LEFT IN CLOUD AFTER ONE DAY Koa Walnut Oak j a Mo99 sr 90 C5137 242 8+8 36 + 36 20 + 5 2 +6 3629 Wes (23-4 10 LO + 23 1 Of the curves for the fraction of Mo?? left in the clouds, the one for the water surface burst shows to a considerable degree the behaviour anticipated when the project was planned, On the reef shot, the points appear to be fluctuating around a fraction of 0, 11, whereas for the land surface detonation there is insufficient data to do anything but extrapolate beyond 6,5 hours, Since it is likely that the fission ratios would be aroun d one 75 -