No. of Particles
I
Station
!
250.04
32
|
250,27
250,24
Averare
Investige ted
Density
|
Standard
Ueviation
a ed
TABLE §.5 - Particle Density
222k
F942
29
2.40
|
1@
2.45
7h
5.5
GROSS FEYSICAL CYARACTERICTICS OF FALLOUT
Comprehensive date on ohysical and chemical characteristics of
fallout are presented in the Project 2.6a renort.28
551
Surface Lard Shots
It is well established that the fallou' from the island shots
was very simiiar to that which occurred after Mike shot et IVY, namely
dry, white, opaque, irrempularly shaped particles. Figure 5.10 shows
Shot, 1 fallout as it arrived on the purmed paper collector loceted at
station 250.04. It ie tynical of fallout from Islerd detonations in
the Pacifie Proving Groum?,
52562
Surface Water Shots
Positive evidence of particulate fallout wag found in the differential collector iucated at Alice Island after Shot 6. However, the
furmed paper collecters located on the free floating buoys after Shot 2
showed no eviderce of ary particles visitle to the naked eye. It is
felt ty come olservers that the fallout tvom the surface weter detons-
tions was primarily in the form of 4 mist or aerosol, This is substantiated to some degree vy the observetion of the identificetion flags
located on the sea stations after Shot 2,
These flags were hivhly
radioactive, many times more active than the total collectors of the
same station. It is reasonatle to asswn- that a moist fine fallout
would te absorted by the flapping flags much more easily than would a
dry particulate,
5.6
TINE OF ARRIVAL OF FALLCUT
The primary instmment for determinine the period over which feli-~
out took plece was the differential fallcut collector. Information on
time of arrival wes also obtained from the ganrs time-intensity recorder
stationed on How Islend; further information may te obtained from timeintensity recorcers onerated by Project 2.2. Also, limited evidence of
arrival tire is uvailabLle from ‘he Task Force Ship's logs and Project 6.4.
67
SN
ems ‘
ww A
4s
{
Ln
SToisboes
|
,
.
|eo, Ag/ew em) i (ver cent)