AQSORS UASG 81-20 Castle-Bravo Air Concentration and Deposition Patterns from a 3-D Partielin-Cell Coce by Kendall R. Peterson May 18, 1931 ABSTRACT The MATHEW-ADPIC eode suite has been extensively modified to give the total external dose from the detonation of the Castle-Bravo nuclear test at Bikini Atoll until evacuation of the inhabitants of neardy atolls. The advantages of this code suite is that it uses all the observed winds (in a mass-conservation sanse) at and after the detonation to provide dose rates and doses due to passage of the debris cloud anc to the time-integrated deposition up to evacuation time. Previous assessments have given the fallout pattern (deposition only} at time H+1 hours. The present code formulation gives excellent agreement with the estimated total external dose (based on measurements) to people on Rongelap and Ailinginae atolls. BEST COPY AVAILABLE *ttorx performed under the auspices of the U. §. Dedartment of Energy under Contract No. W-7405-ENG-48.