T..BLE
3 = Wa.
atoll
Island
Date
Mr Hr
1
2
Rongelap
Rongelap
8 Mar
300
3
Rongelap
8 Mar
350
L
Rongelap
8 Mar
400
5
Utirik
Rongelap (central cistern)
Rongelap (North part of
village)
Rongelap (Northernnmpat
cistern)
Rongelap (Southernmost
cistcrn)
8 Mar
220
7
Rongerik
village)
9 Mar
Eniwetak (Distillation water) 10 Mar
40
240
Sample No.
6
Utirik
Utirik (cistern near church)
Utirik (cistern at south of
9 Mar
LO
- In addition to the above, a sample of foilage was taken at the wind-
ward side of Bikar Island, The radiation ficld was 180 mr/nr on 9 March 195!
at this point.
8.
Conclusions and Recommendations
a The radiological survey proved that a large yield surface detontion can produce extremely serious radiological contamination over a distanc «
more than 120 miles downwind and important contamination about 250 wiles dow
wind.
.
b. The center of the contamination pattern from the BRAVO Shot lic:
somewhat north of Rongelap and Rongerik tolls and probably not far froma Lb
between Bikini and Bikar.
ce Although the fall-out was serious on Rengelap Island located at
the extreme southeast tip of the atoll, the contamination was about ten times
greater at the north side of the atoll, twenty miles away.
d, The caotamination decreased by a factor of about cight over the
downwind distance of 50 miles between Rongelap and Rengerik.
e. Standard military field housing provides a significant degree of
protection to personnel inside,
f.
The AN/PDR-39 proved to be a very satisfactory instrument for
field survey work under rigorous environmental conditions,
ax
.
ge A single DDE with two (2) whale boats is not a completelysatis’
factory method of conducting a broad radiological survey of the type jut
completed, Future surveys should consider using vessels capable of entering
more of the atolls and of handling a helicopter and several small boats.
6 Incls:
1, Rad.
2. Rad.
3. Rad.
LL. Rad.
5. Rad.
Survey
Survey
Survey
Survey
Survey
Rongelap
Utirik
Bikar
Rongerik
Ailinginae
5
/s/ Herbert Scoville
DR. HERBERT SCOVILLE
Technical Director
5
AFSVP
a
6, Summary of Rad. Survey >