CHAPTIR 6
PRIMARY FALLOUT PATTERNS
‘
ma
Although there was some stem fallout vest of tae snot
roint as indicated by the trajectory analysis precented in Section 5.5,
the free-floating sea stations fe Shot 1 were luid just beyond tne
westward limit of the gamma field. Concesuently tae buoys showed that
inappreciable amounts of meterial from Snot 1 fell in the srea sanvled.
For Shot 2, free-floatinz stations docunented fallout to a distarce of
50 nautical ~iles.
A complete analysis of the fallout patterns to a distance of 300
nautical miles is presented for Snot 1. Because of the linited experi-
mental data available for tiis snot it was not possille to reconstruct
tae contours on tais basis alone.
‘the samma field data were surple-
mented by developing an exnerimental model of tne fallout mechanism
wWhicn defined the axis of symmetry of the pattern.
abled one to construct a conplete contour pattern,
This addition en-
Fallout patterns for Snots 5 and 6 were derived from water sam-
pling data and are considered in Project 2.7.4/
6.1
FALLOUT NEAR GROU!D ZERO FOR SHOTS 1.3.4.AND 6
To obtain the infinite field ga-ma levels witain the atolls, taree
basic collecting devices were fpleced on the islands and on the rafts
within tne lagoon as follows:
(a)
Totel collector - a 7-in. diameter polyethylene funnel
(b)
Gummed paper collector - 1 sq ft of Xum—Kleen ecetate-backed
fitted to a legal polyethylene bottle.
paper stapled to a cardboard backing supported in a metal tray.
(ec)
Project 2.1 film badges placed toth vertically and horizon-
tally.
By comparing the laboratory mes:ured levels of gamma activity ob~
tained from sanples that were collected on islands with the actual in-~
finite field gamma survey readings, a relctionship was developed and
Th
ou NMe
taken for Shot 5.
.
Data were
obtained under tne land and lagoon phase for Snots 1,3,4, and 6. The
legoon and islends were not contaminated after Shot 2 and no data were
WwW ‘
The extent of fallout documentation ucder the two operctional
Phases of Project 2.5a was different for the various saots.