SLIDE 59 Utirik summary. guse of the body-burden extrapolation equation leads us to the conclusion that ~~Zn could have been the major contributor to the ingested activity during the first years post-rehabitation of Utirik Atoll. This was supported to some extent by a Japanese report (JCCRRER56) which indicated to us a rise in the photon count rate at the surface of various types of tuna retrieved from the Marshall Islands’ fishing grounds from March to August 1954 (100-10,000 cpm). Fish with count rates greater than 100 cpm at the surface were discardedby the fishermen. prominence of Radiochemical techniques indicated the Zn in the tuna's edible flesh. For committed effective dose equivalent, she impact of nuclides with a short mean residence time in the diet (~~Zn, Co) was greater at Utirik because the population reinhabited within months of the BRAVO evens. The ippact of nuclides with a long mean residence time in the diet ( Cs Fe) was greater at Rongelap because of greater initial contamination. 1954-2004 UTIRIK PROTRACTED EXPOSURE SUMMARY Ba Nuclide Co 87Cg 8 7n Sy Fe External Total . 50 Year Intake Sv Adult Mean Committed Effective Dose Equivalent 0.00044 54,000 860,000 5,200,000 1,700 1,900,000 Natural Background Subtracted — 57 0.013 0.030 0.00010 0.00036 0.041 0.085 Sr,