small.
Shot 3.
No samples suitable for particle analysis were obtained from
Followins Shot 1, 6971 radioactive particles were analyzed from
the area within the Bikini Atoll and 621 particles collected on the outer
atolls of Ailinginac, Rongelao, and Utirik were eveluated.
The differ-
ential fallout collector on the {sland of Alice contsined some particulate from Shot 6. These data are also presentec.
5.2.1
Shot 1, Close-in Fallout
The size distribution of close-in fallout particles with resnect
to time for four lagoon and torse island stations are given in Apnendix
C. Only radioactive particles are included in the data. Of the 40
available sampling increments within each differential collector, those
increments that visually appeared to contain a large amount of particuiate were selected for analysis. Increments over a wide time period
were likewise selected, Analysis of the bar graphs with resrect ‘o
rate of arrival or time of arrival is therefore an approximation. Data
on tine of arrival are presented in Section 5.6 of this report.
Figire 5.4 shows the siza frequency distribution of the Shot 1
close-in particulate.
It is a comzosite of the bar granhs for the four
lagoon and three island stations.
(Figs. C-l through C-7.)
Fivure 5.5 is a plot of the cumulative size distritution of
Shot 1 particulate presented en a log probability ceranh. The size
distribution is very close to log normal with a geometric mean particle
dinareter of 112 4,
e262
Shot 1, Cutec Island Fallout
Satoles of earth were collected ty the outer island survey veam
following Shot 1. 15/ The radioactive narticulate found in these acil
saccles was analyzed for size distritution and the recults are presented
in Fir. 5.6. These atolls were 70 to 2°0 noutic2i miles from Shot 1.
Ficure °.7 shows a lov normal size distribution for particles collected
on whree atolls. The eeonetric meen particle diareters are precentod
in Tatlle ©.A.
TasL7 45,4 = Geometric Lean Partict e lareter
-——
_
Atoll
2
=——
lp
Dictinee from’
4
Geonetric hiein
Shot. Point !rertic’e Die.eter
{
|
—
|
#ikini
—
190
Adjlinginae
Reaselon
L
(n mi )
Utirik
(u)
|
70
|
107
.
‘
{
277
59
112
t
|
—_—|
|
£9
|
70
|
45
i
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