51 1} 90. A While using their figures for biological half life of this period of 81 days extrapolating back to 30, we come out with a body burden of 1.4 microcunes at 30 days. Barium comes out .7, Lanthanum is .7. The remainder of the activity, the rare earth group, comes out .4} 6 Strontium, barium, and the rare earth group together 7 constitute about 75 per cent of the total beta activity. 8 _ Alderson Reporting Company Washington, D. C 9 -_. If you want to extrapolate this back to one day -- 10} and this is a very difficult thing to do --~ we decided the 11 best 12 Strontium is 13 level. 14 give a value quite a bit higher. 15 way to do this would be to use the human radium data. known to fall off at the same slope ata lower We have not calculated it for one day, but it will MR. HARRIS: No, f don't think so. JI think if te 16} 30 day level of strontium, taking in per cent of the total 17 amount in bhe body of the dose given, it may come up about 18 the same as the number which we took back to one day. 19 MR. COHN: 20 MR. HARRIS: 21 We will have to check this further. This can be checked. MR. COHN: The half life of strontium in the first 23 three days is quite tremendogs. 24 life of about 4 days. 26 back. af Janarimant of ener AistgriaiV’s Office GHIVES nm Sonv As I reaollect, this puts us in much better agreement than we were before. 22 ARC We found no evidence of calcium 45. It has a biclogical half You have to be careful in extrapolatin Since we have no sample earlier than 16 days, we huve .