= MITCHELL: Ro body incvs - at least Idcn't, That is the blolo half life, then you wuld have to bet inte the prebles retention ani excretion rates, and there is a lot of mation on that coming out newwith regard to short-tern effects with rather large doses ani whether you can say ie the sane thing which ia going te apply with simite over a pericd of 20 years, I dcntt krow, but I would be clined to say that you cannot extrapolate fron that kind data, EC DAR: I would think thet best estimates would be sintJar up 40 cr 50 years, This is really just a guess based on 45 elinination, VOICE: The Nnticm. Bureau cf Stamlards usea 910” days, which roughly 30 years, LIBBY? — Taking your figure, I calculate this as a 1 nlorocurie per iniividuel as the tolerance, is thiscorrect? MITCHELL? Yes. We tock ene other set of figures vhich night be of. interest to the people here, ani that is ve got some agri-| cultural figures vitch tolloated that thare were 27,000 rf of strontium available per acre of lard, ‘ow, if you put 270 micregrams of radicactive strontium mixed into tat, a | vy person eating off that type of lant, ta other vords getting 130