GESECTIVE
Tha fall-out progran was intended to document the hasard from air and
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_
surface bursts.
Thies documentation included the initiel and final
diatedbation of activity, the tise history of accumulation, and the
physical and chemical nature of the sctive material.
PROJECT STHMARY
2.413
the initial dlatribution of activity was measured, using data
telemetered from rockets fired through several parts of the
Cloud and stem as soon as the cloud stabliieed and a few
minutes later. The reckets were timed eo that they penetrated
the various portions of the cloud and stem at the sase tine.
The later set of measurements vere designed to give inforssation
changes with tine.
262s
The radiation intensity in the ocean downwind from tha detonation waa mapped, and depth profilea were sleo meade te allow
determination 6f tha amount of contamination that had fallen
on the surface. ‘The YAts farnished calibration oe points
| forthis purvey.
the tine history of escumletion wee deterained at a number of
glgnificant downwind locations with both moored and floating
stations. These stations sleo collected samples for physical
and chemical studies.
sroreft vere aquipped with radiation cetestion instruments, and
flew over the fall<cut area at an altitude of 200 to OO feet to
obtein a prelininary outline of tha contour pattern.
2.653
The activity deposited on land areas waa moagured to establish
the final distribution, the time history of accumulation, and
the influence ef the bese ourge.
‘The land stations also col-
lected sazples for physical and chemical analysis.
‘the dose
rate at 3 feet above the surface of the islands aad lagoon of
the shot atoll was messured by a probe lewered from a hovering
helicepter.
2.68%
The hazard to personnel in the cloud was studied by meceure-
ments of the radiation intensity in the cleud at early times,
using mamed alreraft. Measurements were also made of reeiduad
eontemination on the aircraft, and samples were obtained.