HEADQUARTERS TaSK UNIT 13 Task APO 187 (HOW) 761 P.O. Bax 8 c/o Postmastor San Francises, Cslifornig TW3~54=375 12 March 1954 SUBJZCT:" Radiological Survoy of Dewnind tolls Contaminated by BRAVO 1. scknowlodgcnent, d Tho meabers of tho survey toam wish to oaxpross their appreciation to Captain, officers and mombers of the crew of tha USS NICHOLIS (DDE 449) for the assistance and csoporation in conducting the survey herein reported, Captain Elliot turned over all possible facilitios of his ship in order to assist in tz survey. LT Prink, tho Exccutive Officer, organised all the operations of the beat partics, and it was only through his porsonal direction and participation that it was possible to carry out the small boat surveys under cxtreacly dire: cenditions, Since most of tho lagoon waters wore net navigable by a DOE, it w necessary to make long boat trips in high ecas and land on tricky coral recfs. That it was possible to mako, without mishap, a detailed surwey of five widely scparatedatolls in tho course of throo days with-only two boats wis largely ¢: to his effortea. 2. Intredusticn . The BRAVO Shot. contaminated a number of atolls in gormrally castward dircetion from Bikini to such an axtont thnt it bocams neccessary to cvacuato t Native populatios from Rengolap, ilinginao and Utirdk jtolls and the silitary porsannol on Rengorik Atoll, Following this covacuation CJTF SEVEN organized ¢ subject detailed radtological survey of tho atolls to the castwnrd of Bikini (Ref. CJTP SEVEN Eninmctok 0604002), the following purpoacs: The date from this survey wero requircd £ a. The wvalnation of thc mdiation offccts on cvacuccs, bv. Tho cstimation of tho clapscd timc before rececupancy. ce Tho astimation of tho rosidual radiation cffsets of larg: yiclds surface dot cnations. Ta connection with this survey, tcams from various Task Groups and ‘& Wilds, Trust Torritary Reprosontative, returned to the atolls to sccure thc cvaguatod habitations, sarvico cilitary cquipment, and obtain documcnt:ry pot graphy. 3e Operational 8 March = 0800} oo a f~) } Jf fd Survoy tonam rendezvous aboard USS NICHOLIS (DDE 449, in Rengelap Lagoon.