SUMMARY AND CONCLUSIONS Extensive modification of the MATHEW-ADPIC code suite has procuced contours of Castle Bravo aecumulated and time-integrated depositicn for fission products. Through the use of dose conversion factors, these contours have been converted to dose rates and total doses uo to the time of evacuation from the atolls affected by the debris cloud. In addition, time-integrated surface concentrations have been both calculated. instantaneous and For the nearest 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 been made in this report. Interviews with natives of Rongelap Village and Ailinginael 9} indicate that manv people ate fresh seafood and drank water from cisterns following contamination of theie 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 fram Bravo was consicerably less than at atolls to the west. However, the orevious section indicated that rain probably occurred during the time of fallout. This would result in wet deposition, producing local doses 10 to 50 times greater than in those areas where rain did not oecur. This effect could have resulted in develooment of thyroid nodules in those Utirik resicents who consumed contaminated food and water. REFERENCES l. Hawthorne, Howard A., Ed., "Comoilation of Local Fallout Data from Test Detonations 1945-1942 Extracted from DASA 1251," Vol. If - Oceanie U. S. Tasts, DNA 1251-2-EX. DASIAC, Santa Barsara, CA W102. May 1279,