SUBJECT: Radiological Survey otDownwand i,toIls Contaninatod by BRAVO 8 March ~ 1000 — 1800 Two partics in sml1 boats surveyed living arcas on Rongelap Island and castern half of Rongclap Atoll. 9 March ~ 0700 = 1130 Two partics in smll boats prococded from the DD which ves stationcd outside Utirik Atoll and surveycd Utirik and Aon Islands, the main islands of tho Atoll, 9 March — 1500 =~ 1700 Onc party in a small boat Jandod on tho outer reef of Bikar Island and surveyed the island, the only large island of Bikar ‘jtoll. 10 March = 0700 ~ 1100 Two partics in small boats proccoded from the Di which was stationod outside Rongcrik atoll and survey> Eniwetak Island (where the Task Forco's Units had beer: stationed) and tho other important islands of the Atel 10 March ~ 1430 - 1980 Two partics in sml1 boats proceeded fromthe LP which was stationed outsido Alinginac Atoll and surve,: the inhabited islands of the atoll, 11 March - 0700 —- 1400 Onc party in a small boat surveyed the northwesi ern islands of Rongclap jitoll and one party rechecked the living arcas on Rongolap Island and cstablished a reference location for future docay measurcaocnts, 12 March - 0800 4. Survoy toam arrived Fniwotok Atoll via DDE. The following personnel from test projects in TG 7.1, TU 13, served as mombers of the survey tcam: Herbert Scoville, Jr. TU~13 Staff Richard Soule Projoct 2.5a Richard Rast Project 2,1 Yalmor Strope Project 6.4 The USS NICHOLAS (DDE 449) supplicd boat crows under the dircction of LT Cliffor: Frink, Executive Officer, for surveys. de Instrumentation Radiac sct AN/PDR-39 was sclcctcd as the instrummt to be used in the conduct ef the survey. Curie Co™Y Fivo (5) cach of AN/PDR-39 wero calibrated with an 80 source twenty-four hours beforo departure. The calibration yiclded ze zcro variation betwocen instrummts - any scale. Upon cross checking three of these instruamts, (a point of actual survoy) in a radiation ficld of 0.320 r/tr .it was found that all three instrumcnts gave the same reading. COPIED/DOE a3 These survey meters wero subject to prolonged uso under adverse condi- tions of dampness (to the point of sca watcr splashing over them), salt deposit and continual rough handling. With one exception, al instrumcnts opcratcd cfficicntly for the duration of the operation. On the final day it was found Le ws yo eT?f wo oe’ . te ’ fi ~ an WY ibe a dae at nde ll fat MikeMe Mee |‘ay 5 . 7°