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Project 2.63 - Collection and Characterization of Fallout with Time T,. Triffet
OBIFSTIVES
To collect samples of fallout and measure radiation field intensities with time at various distances from high yield land, water
and air thermonuclear detonations,
To study these samples from early
times with respect to gamma and beta activity, to analyze them for
chemical and radiochemical composition and to determine certain of
their physical properties, including distributions of particle sizes,
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INSTRUMENTATION
Instrumentation was similar to that usedon
(CUTROKFE), YAG-4O was located approximately 55 miles, YAS-29 approximately 95 miles, and LST~£112 approximately 145 miles from ground zero.
Rrsures
Approximately 92 percent of all project instrumentation functioned
properly ani no significant damage to any station from blast or thermal
effects was reported,
All island, barge and raft stations received re-
latively heavy fallout, although radiation levels were not excessively
high; and skiffs AA, BB, CC, DD, GG, HH, and MM also collected samples
of moderate activity.
Surfece readings of samples collected on island,
raft ani barge stations averagei 400 mr/hr at 1300 on 2 #4 1, with some
as hich as 2 r/hr; times of arrival in the immediate atoll area varied
from about 14 minutes at the rafts te about 28 minutes at Aomoen and
Bikini Islanis.
Prior to this event one Incremental Collector on the
YFNE 29 was set for a two minut> cycle, all others being set for 15
minutes; thus, since each of these instruments operated as planned,
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