Bec: enying. 24 Bs =a Navely, in « very young individual who is exposed to « certain level of Sr” you would get a more or less uniform distribution. Tm an adult, I suppose, you would get deposition mostly at the surface, but if you had the eane level cf Sr” in your calcium then this level would also exist in that part of your bone vhich is recently deposited, and therefore you vould have to get the same level of Sr” per caleius to get « damaging radioastivity. SOLOMOR: I think that Bvans has got some unpublished estimations that there ere hot spots of ealcium 45 in the bone that are as mich as five times the mean Geposition. I haven't read the peper, and this is just some gossip I have heard so I think that it may very well be quite an unusual distribution. LIBBY: Tie mean free path of the radiation is probably abeut one milineter. This is sart of average. BETEE: This vould be a sort of mean free path. Well, you have about two atliion volt energy losses per gram per Square centimeter for fast particles. Yow the limit of the beta spectrus is 2,000,000 volte; we assume that the average was 600 kilovolts and 600 xtlovelts is not quite a fast partiele ao you get 5/loths of a gram per square centineter range. LIBBY: Provably a little more dense than vater. BETHE: Yes, 90 you may get 2 Iesters. LIBSY: 80 any structure finer than that is of no consequence. ey DUE ARCHIVES