a
TABLE 3 - WATEn

Sample No.

Atoll

Isjand

Date

ur jr

1
2

Rongelap
Rongelap

6 Mar

300

3

Rongelap

6 Mar

350

4

Rongelap

8 Mar

400

5

Utirik

Rongelap (central cistern)
Rongelap (North part of
village)
Rongelap (Northernmost
cistern)
Rongelap (Southernmost
cistern)
Utirik (cistern near church)

8 Mar
9 Mar

220
40

7

Rongerik

Eniwetak (Distillation water) 10 Mar

6

Utirik

Utirik (cistern at south of
village)

9 Mar

40

240

In addition to the above, a sample of foilage was taken at the win

ward side of Bikar Island, The radiation ficld was 180 or/hr on 9 March 19
at this point.
8.

Conclusions and Recommendations

ae

The radiological survey proved that a large yicld surface detoi

tion can produce extremely serious radiological contamination over_a distan:

more than 120 miles downwind and important contamination about 250
wind,

miles do

b, The center of the contamination pattern from the BRAVO Shot li
sonewhat north of Rongelap and Rongerik jitolls and probably not far from a.
between Bikini and Bikar,
c.

Although the fall-out was serious om Rongelap Island located a

the extreme southeast tip of the atoll, the contamination was about ten tim
greater at the north side of the atoll, twenty miles away.

d, The contamination decreased by a factor of about cight over th
downwind distance of 50 milcs between Rongelap and Rongerik.
e.

Standard military field housing provides a sigificant degree

f.

The AN/POR-39 proved to be a very satisfactory instrument for

ge

A single DDE with two (2) whale boats is not a completely sati

protection to personnel inside,

field survey work under rigorous environmental conditions.

factory method of conducting a broad radiological survey of the type jud
completed, Future surveys should consider using vessels capable of enterin
more of the atolls and of handling a helicopter and several smi boats,
Di,

6 Incls:

1, Rad, Survey Rongelap
2, Rad. Survey Utirik

3. Rad. Survey Bikar

4, Rad. Survey Rongerik

5. Rad. Survey Ailinginae

6, Summary of Rad. Survey

woul © atl

/s/ Herbert Scoville
DR. HERBERT SCOVILLE

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