MITCHELL retained, in I right on that Dr. Western? That for thy eercscls stuly thing ---- just state sose percent. Me, Eisenbud is cur expert on that, in that field, MITCHELL Whatever the facter of retention is then you vould have reduce this muber, since it is worked cut on the of 100 percent retenticn, LIBBY: May I ask you a sanll question, Dr, Mitabell? thy or??> MITCHELL! You mean as the hasard? Why ie it the important lactope? I*4 like for you ani Dr Western to develop this in the next 5 nimtes if you cen, Why is it more iaportant than other radicactive materials ™ Awmeret rts 1377