bee HEADQUARTERS TASK UNIT 13 Task Group 7,1 APO 187 (HOW) P.O. Box 8 c/o Postmaster San Francisco, California TU-13~54-375 SUBJECT: 1. 12 March 1954 Radiological Survoy of Downvdind Atolls Contaminatcd by BRAVO Acknowledgement The members of the survey tcam wish to express thoir appreciatio to the Captain, officers and moanbers of the crow of the USS NICHOLAS (DDE 449) for theiz assistance and cooperation in conducting tho survoy herein reportcd, Captain Elliot turned over all possible facilitics of his ship in ordcr to assist in the survey. LT Frink, tho Exccutive Officcr, organizcd all the operations of the boat partics, and it was only through his personal dircction and participation that it was possiblo to carry out the small boat surveys under extremly difficu™ eenditions, Sincc most of the lagoon witcrs were not navigablic by a DDE, it was neccssary to make long boat trips in high scas and land on tricky coral recfs, That it was possible to make, without mishap, a detailed survey of five widely scparated atolls in the courso of three days with only two boats was largely duc to his efforts, 2. Introduction The BRAVO Shot contaminated a number of atolls in gercrally castward direction from Bikini to such an cxtent that it became necessary to ovacuatec trnative populations from Rongclap, Alinginae and Utirik Atolls and the militar; persannel on Rongerik /toll, Following this cvacuation CJTF SEVEN organized tho subject detailcd radiological survey of the atolls to the castward of Bikini (Ref. CJTF SEVEN Eniwctok 0604002). the following purposcs: The dats from this survey wero required for ae Tho cvalnation of the radiation effcets on evacuccs, b. The estimation of the clapsed time before rcoecupancye c. The cstimtion of tho residual radiation cffecets of large yiclds surface dctonations. In connection with this survey, tcams from various Task Groups and Mr, Wilds, Trust Torritory Representative, returned to the atolls to secure the evacuated habitations, service military cquipment, and obtain documcntsry photo- graphy. Lin 2/D0E Re 3. Operational Schedule 8 March — 0800 M3}351 Survey tcam rendezvous aboard USS NICHOLAS (DDE 449) in Rongclap Legoon, bel BOS| ut } Y