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WI~1313
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Operation REDWING.
C. W. Luke, D. L. Rigotti, J. W. Kinch, R. Fullwood, and
:
D. Anderson, September 1959.
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SECRET-RESTRICTED DATA
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7
NEUTRON-FLUX MEASUREMENTS.
r
wad Measurements were made of neutron flux and spectrum from Bursts
Cherokee, Yuma, Kickapoo, Blackfoot, Erie and Osage during Operation Redwing.
Neutron-dose measurements made by chemical and semiconductor dosimeter were
~
compared with the dose calculated by the single-collision theory from the
neutron flux and spectral data.
The effect of the presence of different
proportions of borax and sulfur on the shielding efficiency of concrete
against neutrons was studied during Burst Blackfoot.
No data were obtained
during Burst Cherokee because of the difference between the actual and
intended ground zero.
The variation of the neutron flux and the device fired
from Bursts Yuma and Kickapoo was energy dependent.
There is little or no
increase in the attenuation of fast-neutrons by adding borax or sulfur to
concrete.
The attenuation of the thermal-neutron flux is increased by adding
borax,
The measured neutron dose per unit yield was higher for all bursts
than was predicted by TM 23-200.
However, only the Yuma, Blackfoot, Kickapoo,
ses
and Osage data fall beyond the factor or reliability stated in the mammal.
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.
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WI-1319
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LAND FALLOUT STUDIES (U).
Operation REDWING.
M. Morgenthau, H. E. Shaw, R. C. Tompkins, and P. W. Krey,
;
February 1960.
SECRET-RESTRICTED DATA
ated
udy.
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(Supersedes ITR-1319).
The objectives of the project were to
obtain fallout samples and perform radio-physical and radiochemical measurements on the samples, prepare dose-rate contours in the immediate area of
the atoll, and evaluate the role of base surge in the transport of radio-
active material.
Time-incremental and gross fallout samples were collected
on islancs of Bikini Atoll, on a barge in Bikini Lagoon, and on three ships
‘ls.
in the downwind fallout area after Burst Cherokee, an air burst, Bursts
Zuni and Tewa, land-surface bursts. Gross fallout samples were collected
on island of Eniwetok Atoll after Burst Lacrosse, a land-surface burst.
Ground contamination was measured after Bursts Lacrosse, Zuni, Flathead,
:
,
Mohawk, Navajo, and Tewa by lowering a probe from a helicopter to a
height of 3 ft above ground.
Factors for converting dose-rate readings
from various altitudes to detectors were installed at a few close-in
stations for Bursts Zuni, Flathead, Navajo, and Tewa.
.
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Early decay of gamma
dose rate agreed well between field and laboratory.
Most of the fallout
wradioactivity from land-surface bursts was associated with particles between
149 ana 420 microns, and the activity per unit weight increased with distance
from ground zero.
The aerial-survey technique proved a practical way of
Measuring surface contamination in high-radiation fields.
WNRG
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hips
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.