PREFACE The authors are indebted to CHGUN L. G. Barr, the Radiological Safety Officer for the Naval Air Station, Kwajalein and to the membersof the radiation survey and decontamination teams of Squadron VP— 29 for the radiological survey data obtained from 3 March until the arrival of the personnel of Project 4.1 on 9 March. The Trust Territory representatives, J. E. Tobin and Marian Wilde, established and maintained a close liaison between the Marshallese and the personnel of Project 4.1. They also rendered an invaluable service as interpreters. _ ’ The authors wish also to express their gratitude to the Marshallese people, whose understanding of their predicament, together with their patience regarding the many clinical laboratory tests to which they were subjected and their willingness to be of help, greatly facilitated the collection of subject data. The services of John (village magistrate), Billiet (school teacher), Jabwe (village doctor),and Niktimos were especially helpful. ep! The aid of Harold J. Coolidge and F. Raymond Fosberg of the Pacific Science Board (National Research Council) in supplying specific publications pertinent to the various aspects of the present report is most sincerely appreciated. The authors are, in addition, especially grateful to the following individuals for . apecific contributions made in either furnishing or aiding in the collection of material: CHGUN L. G. Barr, the Radiological Safety Officer, NAS, Kwajalein (in charge of the decontamination procedures); the radiological survey team of Squadron VP— 29 (made all original readings of the external radioactive contamination of the Rongerik personnel); CDR W. S. Hall, MC, USN, and LT J. S. Thompson, MC, USN, of the U. S. Naval Dispensary, Kwajalein (collected dosimetry readings and made them available); and M/Sgt R. E. Pletsch and CWO J. A. Kapral, stationed at Rongerik (rendered continuous aid and cooperation in the collection of factual data concerning the period of fallout at Rongerik).