are based mostly on activity which has condensed or become connected to Pacific Island coral or sand particles and the results may not be applicable to other types of environment. Activity information for each of several isotopes in each fraction are presented in the Project 26b report. TABLE 3.15 ~ Per Cent of Total Activity of Shot l Size Graded Samples from How Island* NUD of Fraction price Per Cent of 22901 0.975 0.112 0.923 0.597 1.031 0.400 0.522 0.408 0.646 0.691 0.757 0.983 19 662 30.608 Per Cent of of Frac~ tion in Activity in Fraction Total Weight Arbitrary teicke lel 32 22 27 38 56 69 79 98 103 160 171 195 > 225 TOTAL 9047 3019 0.366 302 1.95 3 36 1.71 1.31 1.33 2ell 2226 2047 3-21 64420 100 Total Units at D/ 7 Days , 731 2029 0.323 2045 1.96 3022 1.16 1.30 0.950 1.45 1.56 1.58 1.98 1345 41.0 17.8 5 59 0.788 5298 4e78 786 2483 3017 2032 354 3-8 386 4.83 32.9 100 x * Project 2.4b results 12 Project 2.4b reports the fractions as the mean volume diameter of the particles, not as the number mean diameter st 3.10 Weight (gm) Total Activity Both radioactive and non-radioactive particles in the fraction PARTICLE CHARACTERISTICS The average density of all particles was about 2.6 g/cc. The index of refraction of all Shot 1 particles was about 1.544. The fallout material from Shots 1, 2, and 3, which remained after the removal of samples for particle-size analysis, were mixed and sieved through 420, 210, 149, 105, 74 and 44 micron sieves. (Not enough fallout was collected from Shots 4 and 6 to make these analyses). Fach fraction from each shot was separated into two groups. 90