410421 UASG 81-20 Castle-Bravo Air Concentration and Deposition Patterns from a 3-D Particle:n-Cell Coce by Kendall R. Peterson May 18, 1931 ABSTRACT . The MATHEW-ADPIC code 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 innabitants of nearoy atolls. The advantages of this code suite is that it uses all the observed winds (in a mass-corservation sense) at and after the detonation to provide dose rates and doses due to passage of the debris clouc and to the time-integrated deposition up to evacuation time. Previous assessments have given the fallout pattern (deposition only) at time H+l hours. The oresent code formulation gives excellent agreement with the estimated total external dose (based on measurements) to oeople on Rongelap and ilinginae atolls. BEST COPY AVAILABLE <\orck performed under the auspiees af tne Contract No. W-T4I05-ENG-48. U. §. Department of Energy under