MITCHELL (contimed ) of strontiua to &™, in the dietary intake of the perec te bring that person te tolerance in 20 years, Mow, thet enables you te neglect all the unknowns with regard to ef excretion and aacunts cf retention ani things like if you accept the figure of gradual accumiation of 7/10 of gran, BACHER ¢ Would you repeat that figure again, sir? MITCHELL: Pardon? LIBBYs MITCHELL: This is Sr” to stronting, 1 in « hunired alllion if all the body strontiua has that ecmposition, ‘This is Is that correct? That would be a tolerance dose accumlated over a period 20 years, Nowif the person, let us say, were taking & Like that at all times, then by the tins he reaches his. adult period, the amcunt of additional mterial he wuld taking in would equal the amcunt he was taking cut, in words, the equilibriva there presumbly vould not ones further aceuaulation of the radiation, presuning that it @ constant amount throughout the whele crowth period ani inte the periad of adult life, That would be coe way of lccking at this thing, VGICEs what is the bicphalf life of strontinal -