C. 3. ADANS: ( continued) LIBBY: in the sazuples then would be indicated by a normal distribution curve. So this is another argasunt for the assay. know anything about it. Ke really do Now 1% aay te that in the bigge boazbe the fireball stays hot long enough so that there's some hore of incorporating thie staff in a sort of an insoluable coating. [ think ona would say there was so evidence in ordinary fission produ:ts that the stuff is incerporated in aluaines oxide or silica or something el tiat is there when the vapor is formed in the sarly stag of the fireball and as the thing cools this condenses and you Lave molten droplets which entrain and dissolve the fission product. This is a sechaniss, this sakes y sort of rubles, where the thing is protected chemically from the action of waters. This would sake the stronti less available to the biosphere and would be a happy th but 1% does seem that in low yield bombs that the stront ig just about as available as it could possibly be. Now maybe the ideas won't fit, but thie is another point and another reason for it. So we have abundant reasons for doing worldwide assay on sy?e VoICss Ig the Sr°~70 content of the atucaphera know? VOICcz: Sr99 goes not occur in nature except insofar as its prot by the anall azounts of radioactivity. 68