SUMMARY AND CONCLUSIONS Extensive modification of the “IATHEW-ADPIC code suite has produced contours of Castle Bravo accumulated and time-integrated deposition for zross fission produets. Through the use of cose conversion factors, these contours have been converted to cose rates and total doses up to the time of evacuation from the atolls affected by the debris cloud.’ In addition, both time-integrated surface concentrations have been calculated. instantaneous and For the neurest atolls, the calculations agree well with the measurements and total dose estimates based on these measurements. At the more cistant atolls the agreement is not as good, indicating the need for more "tuning" of the code input parameters. The internal dose to the inhabitants of tne affected atolls have not heen made in this report. Interviews with natives of Rongelap Village and Ailinginae! 2) indicate that many people ate fresh seafood and drank water from cisterns following contamination of theic islands. Although there is no direct evidence that those at Utirixk ate and drank contaminated fooc and water, it seems likely that they did since the dry deposition from Bravo was consicerably less tnan at atolls to the west. However, the previous section indicated that rain probably neecurred during the time of fallout. This would result in wet deposition, producing local doses 10 to 350 times greater than in those areas where rain did not occur. This effect could have resulted in develooment of thyroid nodules in those Utirik residents who consumed contaminated food and water. REFERENCES L. Hawthorne, Yowacd A., Ed., "Compilation cf Local Fallout Data from Test Detonations 1945-1962 Extracted from DASA 1251," Vol. Il - Oceanic U. S. Tasts, DVA 1251-2-EX, DASIAC, Santa Barcara. CA 5102, May iat4.