oot.ed sleet gee Swateee a 5 Insufficient data were cbteined to study the effect of zero point environment adequately. It was found that the surface land shots produced predominantly solid fallout, while the surface water shots preduced predominantly liquid fallout, Iron was found in Zallout from one of the barge shots. 9 peanalkis” and .7 show that the gaseous precursor,poet or89 ana Ba increased with time in comparison to M077 and Ce This result can be attributed to the expected asacctation of gaseous precursor nuclides with late condensing material, The iron from the short barge, which has no precursor, behaved lixe Mo?? and Ce An insufficient number of samples was obtained to find a correla tion of radiochemical composition with distance. Furthervore, for such large shots the samples collected were probably not at sufficiently different distances from ground zero to ahew significant effects on radiochentcal composition, Beyond the fact that there wae radioactive liquid fallout fron Shots 1, 3, and, this project obtained little information of value about liouid fallout because shot delays and slow recovery permitted significant evaporation of the liquid phasea,253 that li d volumes could not be determined with any accuracy, 9 and BaltO showed the greatest tendency to be concentrated in the liguid fallout. As pointed out in Section 3.1, the base surge sampling was unsuccessful, The Program Director 22/ has quoted Project 1.le to the effect that there was no base surge of significant extent, S.S GROSS DECAY The slopes of the gross decay curves measured from 110 to 200 days after Bravo shot for each particle size fraction are plotted in Fig, 5,8 as a function of particle size, Below SO p there is a slight decrease in the gross decay rate with increasing particle size, Above 50 » the general trend ia not as clearly defined, However the entire curve reo sembles the activity behavior of the concentration of sr69 and Bai with recpect to particle size, According to Hunter and Ballou sr89, x72, Zr95, NI, and R203, Celt, Catt Pr contribute approximately 90 per cent of the total activity t the time the grossa decay measurements were made, The ine cuced cal also contributes significant activity in the fallout samples after 110 days, Cell, rulO3 and x?) were not analyzedbut an estimate of the contapitsons of the first two can be made 137 lying the megs red C concentrations by the literature Rul and Celhl/ Ce values for thermal fission of U235, Sings yal (ee a 9 second rare gaseous precursor, Y91 may behave like ? which has a 2,6 minute rate gas precursor, Consequently the concentratisns can be calculated from the Sr°9 concentration and the Y?1/559 literature value, If these activity concentrations are corrected for the moumting absorp~ tior of the counting rig in which the gross decay measurements were made, 4h SECRET ~ RESTRICTED DATA