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OFFICE MEMORANDUM -.
Carl Buckland, BL | BARRE October80, 1962
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"CLOSE IN FALLOUT" FROM CASTLE BRAYO
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The following measurements were made at various times at the places dadicated
following the March 1, 1951" detonation at Bikini Atoll. Speed of movement to
all points is bisec on a measurement by 4 recording gauma meter located on.
Eniwet@k Island, Ronzgerik Atoll. The meter indicated start Of arrive) at
f+ 7-3/4 hours, with an estimted ‘peak reading at H.+ 8-3/4 hours. ‘The
distance ie 135 nautical miles, soa mean speed of 17 knots
been used in
the calculations. Extrapolated decay bas been based ‘on the
M°* rate. Ho
allowance has.been mide for weathering Prior to. measurement, 80 the values
are Probebly low.
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The bomb was a surface burat of25 Megatons, 50% fission.
Tre not”Line" of
-the fallout pattern was somewhat to the north-of all the locations listed —
below. Kabelle Island, Rougelap Atoll, is the closest to the “hot line”,
but stil Probeblysone Gis tance from it.
Island. Date- “Reading, | Distance
Location: time
mr/hr
Rongelap D+7
Kabelle
‘Estimted © Estimted
(|B+6:.
@Rhr ~~ 60OR
1000... 108
5+7
D2
H+ 6.35
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B+8 ©. ‘UR/hr-s
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Estimated -
sea miles: Arrival time Pear reeding
375 -°, 103
20425
Eniwetak
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