0018933 Ee 981 R may be off by a factor of 2 due to the small sample size which would decrease the counting accuracy. On Walnut sample 978 L (27.5 hr.) the probe velocity was low and Kr 85 only was determined, Sample 980 L for Oak has been disregarded due to the very low probe velocity which would tend to make the Mo?? to Kr88 ratio too high, 3.3 COMPARISON WITH THE RESULTS OF PREVIOUS TESTS Shots were fired during Operation Redwing under conditions similar to those of the present series and some data are available from published reports which may be used for comparison purposes. Results on the Mo?? to Kr” 88 ratios and Sr’ 90 R-values as a function of altitude in the cloud for the first four hours are reproduced in Table 3.9 from Reference 26. It is noted that for the land and reef shots the Sr?9 R-values increase and the Mo?? to Kr88 ratios decrease ina way generally comparable to the similar Hardtack events, On the water shot the sr70 R-values are nearly constant with altitude, as with Walnut, but the Mo?? to Kr88 ratios are not comparable, The fallout R-values are generally not inconsistent with those arrived at for the Redwing shots by Project 2.63. In view of the fact that the latter lead to radionuclide compositions which generate computed decay curves in good agreement with those actually measured on several different kinds of instruments, this agreement is impressive, 88 The fractionationNO pire tin BRU 88