ind (cd ABSTRA External radiation neasurements were nade at several atolls in the northern Marshall Islands, which are known or suspecrced to have been che reciplenes of tropospheric fallouc during the Pacific Testing Programs. Sufficiene data were available to ascertaix realistic dose predictions for the inhabitants of Rongelap and Utirik Ato.ls where the 30 year integral doses from external sources exclusive sf backgrounc radiation were 0.65 and 0.06 rem respectively. These estimates are based on realistic lifestyle models based cn observations of each ato | community. Atiluk and Wotje Atolls were fcund -2 be representat: es * cegional YXackground radiation Levels.