uy kev activities present in records QA2 and RA2 (see Table 1 for notationel definitions) differ by more than a factor of 3 in percentagewise contribution, Also the 105-kev activi- ties in BA7 and GA2 differ by more than a factor of 3. Dose rates measured 3 feet above the surface of How . Island in the vicinity of the collecting sites have been plotted as a function of time after burst!4 for Shot Zuni. The dose rates calculated from the photon intensities, listed in Table 2, of the two samples received from the How Island collection stations (GA and IA), when compared for the proper times with the curve drawn from the measured dose rates, agree within experimental error. Approved by: A, GUTHRIE Head, Nucleonics Division For the Scientific Director a 29