3.10.1 Particle Appearance The particles from one group were radioautographed for the minimm practicable length of tine. 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 a smaller percentage of coral particles, most of which were in the larger size ranges; tho ~emining particles had a fuzsd, porous, or ashlike acpearance. 3.10.2 Locationof Activity in the Particle. The particles from the sacond group were treated by the method exployad by Cadle24/ to determine their intevnal activity distribution This process could not resolve the location of activity on particles below 149 pe These data are presci.ied in Taole 3.17 and selected radioautosraphs ara illustrated in Figures 3.37 through 3-39. Activ: ity on tha Shot 1 particlos was on the surface in 60 to 70 per cen of the nuuber examined, evenly distributed throughout 21 to 36 per cent ef the particles and unevenly distributed throughout 1 to § per cent of the particles examimed. 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 ner cent and activity wags unevenly distribut3d in zero tc 13 per cei.t of the particler. The percentage of particles with activity on the outsice generally increased cirectis: with size, while the percentage of uniformly radioactive particias generally decreased with size. No trenmis wero roted in the small grou) where the activity was scattered rardonly throughout the particlae There was no apparent ccrrelation batweean the location of activity on the particles and their physical aspearencee Fige 3e20 Shot 1 Transparent Crystalline Particle 45-249 pn. 91