Dr. Robert Conard June 30, 1978 Brookhaven National Laboratory Page 2 ; 3 3 ty ?# ooAdeRhGedate it In addition to these whole body measurements, thin crystal dual NaI-CsI(T1l) detectors were used to determine the possible presence of actinide nuclides in the skull (head) and lungs (thorax). By subtraction of a control subject, it was possible there was no Pu-239 X-ray peak described. Tt has been calculated that with 1.72 uCi of Cs-137 present, our lower limit of detection for Am-241 in the skull 1S approximately 200 pCi. For your information, Laplander (reindeer herder) with you recently. I have enclosed a copy of the population article that I discussed I think it is important that many of these people are recorded as having Cs-137 body burdens Similar to those of the Bikini residents, ‘and I have just sent off a letter to our associates at Dr. Miettinen's laboratory to see if there is any epidemiological health evidence available for this group. . I look forward to our continued collaboration in this area. If you have any questions as. to the meaning of any result, please don't hesitate to call. Very truly yours, Norman Cohen, Ph.D. Assistant Professor of Environmental Medicine NC/3j Enclosures cc: Dr. M. Dr. M.E. Eisenbud Dr. S. Cohn Dr. N. Greenhouse Wrenn Dr. H. Spitz bee: Dr. W. Weyzen i | sgt cen> | O84 Q eee - Similarly, observable in the net spectra obtained by the procedure SY weg of measurement. _ It is concluded, therefore, that there is no detectable Am-241 in either subject at this time saisccuted “he SE, aedohere satin awa from the control subject. eae ot nope Ae pethnearepelionbbesth oe hee A suitable Cs-137 phantom was then subtracted to account for the contribution of the 0.66 MeV gamma of barium-137 m and the 32 keV X ray characteristic of barium. The resulting count rate in the Am-241 60 keV energy region was, as seen in Figures 6-.and 7, essentially non-significant and not different ee to remove the contribution from the 1.46 MeV gamma from K-40.