wI-769
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EVALUATION OF A THERMAL ABSORBING SMOKE SCREEN.
Operation UPSHOT-KNOTHOLE.
Elmer H. Engquist, February 1954.
UNCLASSIFIED
(U).
-
The preliminary report of this work appeared as CRLR 191,
the’ final report, as CRLR 283.
WT-916
-
an
FALLOUT STUDIES, Operation CASTLE.
Edward F. Wilsey, Robert J. French, and Harry I. West, Jr.,
February 1956.
SECRET-RESTRICTED DATA
Fallout stations were set up in various arrangements for shots
avo, Romeo, Koon, Union, Yankee, and Nectar. Measurements were made to
determine (1) the immediate hazards associated with residual contamina-
tion, (2) the mechanism of particle formation, and (3) the characteristics
and significance of the radioactive debris.
SS
Within the atoll, there was no apparent trend of particle-size istribution with distance, direction, or time,
Bravo particles appeared
to be coral or crystalline; those for Koon appeared to be mostly crystalline,
ashlike, or fused.
Outside activity increased directly with particle size
in the range 149 p to 1,000 pp, while the percentage of uniformly radioactive
particles decreased with size.
These two types of particles accounted for
about 90% of the radioactive particles examined.
Activity was randomly
scattered throughout the remaining 10%.
There was no apparent correlation
between the location of activity on the particles and their physical
appearance.
No samples were obtained in the base-surge region.
(vu)
The preliminary report of this work was published as ITR-916;
a special report, CRLR 436.
WI-918
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RADIOCHEMICAL ANALYSIS OF FALLOUT.
Operation CASTLE.
Robert C. Tompkins and Philip W. Krey, February 1956.
SECRET-RESTRICTED DATA
(U)
The objectives of this project were to study the chemical and
radiochemical composition of solid fallout as a function of particle size,
zero-point environment, time and distance of collection, and gross decay
characteristics, and to investigate the chemical and radiochemical nature
of liquid fallout and base surge.
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