186 Health Physics atolls most mmpacted by the Castle series and the Bravo test received external doses in the hundredsto over 1,000 mGy, even though the populations of the three most exposed commumtties (Rongelap Island, Ailingimae, and Utrik) were evacuated shortly after the test Our estimates of doses from external irradiation have been merged with correspondmg estimates of doses from ternal trradiation, given im a compamion paper (Simon et al 2010b),to assess the cancer risks (Land et al 2010) among the Marshallese population as a consequence of exposure to radioactive fallout from the nuclear weaponstests Acknowledgments—This work was supported by the Intra-Agency agree mentbetween the NabonalInsbtute of Allergy and Infectious Diseases and the National Cancer Institute, NTATD agreement #¥2 Al $077 and NCT agreement #Y3-CO S117 Theauthors are mdebted to several mdividuals whose analyses and research have made substantial contributions to this work They mclude Wilham Robison for variousdata and publications on measurements made m the Marshall Islands, Brian Morozfor meteoralag real analysis and graphic support, Robert Weistack for computer pro grammmg support, Dunstana Melo for the review of the manuscript, as well as other scientists who have added to cur understandmg of the contammation and consequences m the Marshall Islands through ther scientific publications, many of which are cited here REFERENCES Beck HL, Bouville A, Moroz BE, Simon SL Fallout deposition in the Marshall Islands from Bikim and Enewetak nuclear weapons tests Health Phys 99 124-142, 2010 Breslin AJ, Cassidy ME Radioactive debris from Operation Castle, Islands of the Mid Pacific New York UmitedStates AtomEnergy Commission, New York Operations Office, Health and Safety Division report NYO 4623, 1955 [Avail able from National TechmealInformation Service ] Conard RA, Knudsen KD, Dobyns BM A twenty year review of medical findings in a Marshallese population accidentally exposed to radioactive fallout Upton, NY Brookhaven National Laboratory, Report BNL 50424, 1975 Eckerman K, Ryman JC. 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