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APO 187 (HOw), c/o Postmaster
San Francisco, Celiforaia
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HEADQUARTERS
JOINT TASS FORCE SEVEN
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22 April 1954
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MEMORANDUM FOR RECORD
SUBJECT<”BRAVO Shot, Operation ——_
2. - PURPCS=: To make a Date
7 recora operationss aspects that were considered prior to BRAVO event of Operation
CASTLE and to analyze the resultant situation in light of
available pre-shot and post-shot inforzetion.
2GENERALINPORMATION
Operation CASTLE is pleaned to
consist of a series of seven
eedetonations as the Pacific Froviag
Grounds, which encompasses Eniwetok and Bikini Atolls.
f
SRAvo
is the code neme that was given the firing of the first device,
SHREP, &t 0645 M on 1 March 1954, off Namu Island, Bikini Atoll.
.
Subsequent to BRAVO detonation radioactive debris fell
on certain inhabited etolls of the northern harshall Islands.
Radiation intensities rose to levels sufficient to warrant evae
cuetion of four atolls and ell personned were removed from these
-atolls to Ewajalein in accordance with the operational energency
plan of JIF SSVEN. Areas evacuated and ganra dosages received
are indicated below:
ATOLL
POPULATION DISTANCEFRODOSES RECETYED
Ailinginse
27
Rongelep .-
Rongerik
Utirik
79 Nil
80 RB (computed)
82
100 NK
100-130 R (computed)
23 ff
153 MM
«15
©.
270 MM
40 - 9B R (Lim badge)
17 R (computed)
(#7) 28 american Service’"personnel; 25 USAF Weather Detachment plus 3 USA Sisnal Corps personnel.
All evacuees are under competent medical care.
S.°
PREVICUS EXPERIENCE AND CHARSCTERISTICS OF NUCLIE
DETONATIONS:
scedioactive debris is an innerent charecteristic
of all nucleer detonations.
It originates from fission fragzests
ani fizedleg
E
ation (Cyncoles),(ereentt Tade
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