TABLE 5.5 - Particle Density
[
Station
|
|
No. of Particles
Investige ted
7
Average
Density
TE
a
250.04
32
|
250.17
29
240
|
250.24
18
2.45
565
|
(g/eu em) | (rer cent)
|
i
Standard
Deviation
-
|
7h
|
74
!
GROSS FHYSICAL CHARACTERISTICS OF FALLOUT
Comprehensive data on vhysical and chemical characteristics of
fallout are preserited in the Project 2.6a renort.18/
5 5el
Surface Lard Shots
It is well established that the fallout from the island shots
was very similar to that which occurred after Mike shot at IVY, namely
dry, white, opaque, irrerularly shaped particles. Figure 5.10 shows
Shot 1 fallout as it arrived on the gummed paper collector loceted at
station 250.04. It is typical of fallout from islernd detonations in
the Pacific Proving Ground,
50562
Surface Water Shots
Positive evidence of particulate fallout was found in the dif- —
ferential collector iccated at Alice Island after Shot 6.
However, the
gummed paper collectors located on the free floating buoys after Shot 2
showed no evidence cf ary particles visible to the naked eye. It is
felt ty come observers that the fallout. from the surface weter detona-
tions was primarily in the form of a mist or aerosol. This is substantiated to some degree by the observetion of the identificetion flags
located on the sea stations after Shot 2, These flags were hiphly
radioactive, many times more active than the total collectors of the
sane station. It, is reasonable to asswn- that a moist fine fallout
would te absorred by the flapping flags much more easily than would a
dry particulate,
5.6
,
‘TIME OF ARRIVAL OF FALLCUT
The primary instrument for determining the period over which fell-
out took plece was the differential fallcut collector,
Information on
time of arrival wes also obtained from the ganrma time-intensity recorder
stationed on How Islend; further information may he obtained from timeintensity recorders operated by Project 2.2. Also, limited evidence of
arrival tine is availaLle from the Task Force Ship's logs and Project 6.4.
o7