= | =‘ WATER
Samplo No.
Atoll
Island
Date
lr Air
1
2
Rongelap
Rongelap
8 Mar
300
3
Rongelap
8 Mar
350
4
Rongelap
8 Mar
4,00
5
6
Utirik
Utirik
8 Mar
9 Mar
220
40
7
Rongerik
Rongelap (central cistern)
Rongelap (North part of
village)
Rongelap (Northernmost
cistern)
Rongelap (Southernmost
cistern)
Utirik (cistern near church)
Utirik (cistern at south of
village)
9 Mar
Eniwetak (Distillation water) 10 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 mr/hr on 9 March 19%
at this point,
8.
Conclusiois and Recommendations
ae Tho radiological survey.proved that a large yicld surface -deto.
tion can produce extremely serious radiological ontamination over a distanc
more than 120 miles downwind and important contamination about 250 miles dov.
wind.
b. The center of the contamination pattern from the BRAY Shot lic
somewhat north of Rongelap and Rongerik Atolls and probably not far froma 1
between Bikini and Bikar,
ce
Although the fall-out was serious on Rongelap Island located at
the extreme southeast tip of the atoll, the contamination was about ten tin
greater at the north side of the atoll, twenty miles away.
d. The contamination decreased by a factor of about eight over the
downwind distance of 50 milcs between Rongelap and Rongerik.
e. Standard military field housing provides a significant degree c
protection to personnel inside,
f.
The AN/PDR-39 proved to be a very satisfactory instrument for
ge
A single DDE with two (2) whale boats is not a completely satis
field survey work under rigorous environmental conditims,.
factory method of conducting a broad radiological survey of the type just
completed, Future surveys should consider using vessels capable of entering
more of the atolls and of handling a helicopter and several smil1 boats.
6 Incls:
1. Rad. Survey Rongelap
2, Rad. Survey Utirik
3. Rad. Survey Bikar
4, Rad. Survey Rongerik
5. Rad. Survey Ailinginae
/s/ Herbert Scoville
DR. HERBERT SCOVILLE
Technical Director _..
AFSWP
6. Summary of Rad. Survey@igeteeiaieaian