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
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