VoIces “Any assay? VOICE: There's never been an assay of sr’? of any sort. EISENBUD: We have started sr99 determination on a large assortaent of fallout materials. I have no data now. The stron~ tiua's been separated and we're waiting for the yttrius to growin. The only sp90 that we have is on those bones that I told you about. YOICEs What is the gr70 yield from therzonuclear weapons? LIBSYs Well 1 don't know exactly, it's probably high. ordinary fission. 5% in There is, of course, a question of the type of weapon yield, but I think in all these things we certainly get a lot of it. Now tomorrow we'll have a more thorongh go around on this subject, and I hope that one of the medical dectors will speak to us a few minutes about thereasons for strontium being such an important isotope. We're not particularly competent in this field, but I think we're all curious. TOLL! Re Would this be the right time as - while you say that strontium is the sain isctope — to ask whether sonething like plutoniu, an alpha enitter, aight similarly be important as a bone seeker? 69