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JOINT TASK FORCE SEVEN
APO 187 (HOW), c/o Postmaster
-
San Franciseo, California
12 April 19540
#”
MEMORANDUM FOR RECORD
SUBJECT:
BRAVO Shot, Operation CASTLE
i.
PURPOSE:
To make a matter of record operational as-
psets 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 infomation.
2.
GENERAL INFORMATION:
Operation CASTLE is planned to
consist of a series of seven detonations at the Pacific Froving
Grounds, which encompasses Eniwetok and Bikini Atolls. BRAVO
/
is the code mame that was given the firing of the first device,
SHRIMP, at 0645 MU on 1 March 1954, off Namu Island, 3ikini Atoll.
Subsequent to BRAVO detonation radioactive debris fell
on certain inhabited atolis of the northern Marshall Tslands.
Radiation intensities rose to levels sufficient to warrant evacuation of four atolls and all persannel were removed from these
atohis to Ewajaleic in accordance with the operational emergency
plan of JTF SEVEN.
are indicated below:
ATOLL
Areas evacuated and gamma dosages received
POPULATION DISTANCE FRO DOSES PESETVED
GROUND ZERO
Aillinginas
ERongelap
Rongerik
Usirik
.
1?
79 TW
80 R (computed)
82
100 NM
100-130 R (camputed)
28 #
133 Ny
154
49-98 R (film badge)
270 NY
17 2 (computed)
(#) 28 American Service personnel; £5 USAF Weather Detachment plus 3 USA Signal Corps persannel.
All evacuees are under competent medical care.
Be
PREVIOUS EXPERTENCZ AND CHARACTERISTICS OF NUCLEAR
DETONATIONS:
xadioactive debris {fs an inherent characteristic
of all nuclear detonmations.
It originates frem fission fragments
CLASSIFICATION CANCELLED @neHaNGEDG [OY SA7/2A7/00/
Authori
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