— =HATER
Sample No.
atoli
island
Date
Mr /Hr
L
2
Rongelap
Rongelap
8 Mar
300 ©
3
Sungelap
8 Mar
9390
*
Rongelap
Rongelap .central cistern)
Rongelap (North part of
village)
Rongelap (Northernmost
cistern )
6 Mar
400
5
Ot irik
cistern )
Utirik (eistern near church)
8 Mar
9 Mar
2=®
4O
7
Rongeri k
Eniwetak (Distillation water) 10 Mar
5
Vt dur uc
Rongelap (Southernmast
Utirik (cistern at. south of
village)
9 Mar
LO
240
In addition to the above, a sample of fodlago was takon at the wind-
ward side of Bikar island,
at this point.
8.
“he radiation fteld was 180 orfhr o 9 March 1954
Conclusions and Recommendat lons
a. The radiological survey proved that a large yield surface detor-.
tion can produce extremely serious radiological contamination over a distances
more than 20 miles downwind and important contamination about 250 miles dow
wind,
&. The center of the contamination pattern from the BRAVO Shot lie:
samewhat north of Rongelap and Rongerik Atolls and probably not far froma L
between Bikini and 2kar,
¢. Although the fall-out was serious on Rongelap Island located at
the extreme southeast tip of the atoll, the contamination was about ten times
greater at the acrth side of the atcll, twenty miles away.
d. The camtamination decreased by a factor of about eight over the
downwind distance of 50 miles between “Nongelap and Rongerik.
e.
Standard military field scusing provides a sigificant degree of
protection to personnel inside,
f
The AN/PDR-39 proved to be a very satisfactory instrument for
g.
A single DDE with two (2) whale boats is not a completely satis—
field survey work under rigorous environmental conditions.
factory method of conducting a broad radiological survey of the type jut
completed, Future surveys should »isider using vessels capable of entering
more of th atclis and cf hardling » cclieopter and several small boats,
6 Incls:
L. Rad. curvey Rongelap
2. Rad, curvey Jtirik
3. Rad. Gurvey Bikar
AFWL/No
4. Rad. ‘urvey Rongerik
S. Rad. urvey Aillinginae
6, Summary cf Rac. Survey
3s’ Herbert Scoville
OR. HERBERT SCOVILLE
Technical Director
AFSWP
;
és
7