SUBJECT: Radiological Survoy of Downwind Atolls Contaminatod by BRAVO ‘8 Mareh ~ 1000 ~ 1800 Two partics in smll boats survoyed living arca 9 March ~ 0700 ~ 1130 Two partics in smll boats procecdod from the I on Rongolap Island and castorn half of Rengclap Atoll which wes stationed outside Utirik Atoll and survoycc Utirik and Aon Islands, tho main islands of tho Atoll 9 March — 1500 ~ 1700 Onc party in a small boat landod on tho outer roof of Bikar Island and survoyed tho island, the o1. largo island of Bikar Atoll, LO March ~- O70€0 ~ 1100 Two partics in small boats proceeded from the I which was stationod cutside Rongorik Atoll and survc; Eniwetak Island (where the Task Forco's Units had boc stationed) and tho other important islands of the Ato. 10 March ~ 1430 ~ 1960 Two partics in smll boats proceoded fromthe I which was stationed outside Alinginao Atoll and surve the inhabited islands of tho Atoll 11 March - 0700 ~ 1400 Onc party in a emall boat survoyed tho northwes orn islands of Rongclap Atoll and one party rocheckod tho living arcas on Rongolap Island and ostablisticd a roforenco location for future docay measurcmnts. 12 March ~ 0800 4. Survoy toam arrived Fniwotok Atoll via DDE. The following personnel from tcst projects in TG 7.1, TU 13, scrved as members of the survey toam: Horbort Scoville, Jr, TU-13 Staff ¥almer Strope- Projoct 6.4 Richard Rast Richard Soulo Project 2.1 Projoct 2.5a The USS NICHOLAS (DDE 449) suppliod boat crows under the dircetion of LT Cliffe Frink, Exocutive Officcr, for surveys. 5« Instrumontation Radiae act AN/PDR-39 was solcetcd as the instrummt to be used in the conduct of tho survey. Fivo (5) cach of AN/PDR-39 woro calibrated with an 6&0 Curic Co source twenty-four hours before departure, The calibration yielded zcro variation between instrumants - any scalco. Upon cross chocking three of those instrumants, (a point of actual survey) in a radiation ficld of 0.320 r/+ it was found that all threo instrumcnts gave the samo roading. These survoy moters woro subject to prolonged use under adverse conditions of dampness (to the point of sca watcr splashing over them), salt deposit and continual rough handling. With ano exception, all instruments opcratcd efficiently for the duration of the operation. On the final day it was found \ é \2