310.1 Particle Appearance The particles from one group were radioautographed for the minimm practicable length of time. Those which were found to be radioactive were classified according to appearance. The results are presented in Table 3.16. Representative particles are illustrated in Figures 3.30 to 3.36. The large particles from Shots 1 and 2 appeared to be coral, whereas the smaller particles had a more crystal-like appearance. Fallout from Shot 3 had 4 smaller percentage of coral particles, most of which were in the larger size ranges; the vemining particles had a fuzed, porous, or ashlike appearance. 3.1062 Location of Activity in the Particle. The particles from the sacond group were treated by the method employed by Cadle24/ to determine their internal activity distribution, This process could not resolve the location of activity on particles velow 149 pe. These data are presciied in Table 3.17 and selected radioautographs ara illustrated in Figures 3.37 through 3639e Active ity on tha Shot 1 particles was on the surface in 60 to 70 per cent of the number exantinad, evenly distributed throughout 71 to 36 per cent ef the particles and unevenly distributed throughout 1 to & per cent of the particles examired. The activity on the outside of the Shot 3 particles varied from 32 to 37 per cent. Uniformly radioactive particles varied from 3 to 55 par cent and activity was unevenly dis=tributsd in zero to 13 per cent of the particles, The percentage of particles with activity on the outside generally increased directi:- with size, while the percentage of uniformly radioactive particies generally decreased with size. No tremis were noted in the small group where the activity was ecattered randomly throughout the particle. There was no apparent ccrrelation batween the location of activity on the particles and their physical anpearence. Fige 3020 Shot 1 Transparent Crystalline Particle 49-149 n. 91