SUMMARY AND CONCLUSIONS Extensive modification of the MIATHEW-ADPIC code suite has produced contours of Castle Bravo accumulated and time-integrated deposition for gross fission products. Through the use of dose conversion factors, these contours have been converted to dose rates and total doses up to the time of evacuation from the atolls affeeted by the debris cloud.’ In addition, both time-integrated surface concentrations have been calculated. instantaneous and For the nesrest 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 the affected atolls have not heen made in this report. Interviews with natives of Rongelap Village and Ailinginael 8! indicate that manv people ate fresh seafood and drank water from cisterns following eontamination of their islands. Although there is no direct evidence that those at Utirik ate and crank contaminated food and water, it seems likely that they did since the dry deposition from Bravo was considerably less than at atolls to the west. However, the previous section indicated that rain probably necurred during the time of fallout. This would result in wet deposition, producing local doses 10 to 30 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 1. Hawthorne, Howard A., Ed., “Compilation of Local Fallout Data from Test Detonattons 1945-1962 Extracted from DASA 1251," Vol. If - Oceanie U. S. Tests, DNA 1251-2-EX, DASIAC, Santa Barnara. CA 95102, May 1279,