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OPERATION REDWING—PROJECT 2.52
Neutron-Induced Soil Radioactivity, Extracted Version
Cowan, M., Jr.
Tia TrPE JF REPORT
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[1S PAGE SUNT
=ROM 561501 to 540731
591210
‘o SUPPLEMENTARY NOTATION |his report has had sensitive military information removed in order to
provide an unclassified version for unlimited distribution.
The work was performed by the
Defense Nuclear Agency in support of the DoD Nuclear Jest Personnel ReviewProgram
COSATI CODES
18 SUBJECT TERMS (Continue on reverse if necessary and identify by block number)
Z
Yuma Burst
GRUP
3
HELO
18
8
SUB-GROUP
Redwing, Project 2.52
Soils
Cherokee Burst
Gamma Radiation
‘9 ABS”RACT .Continue on reverse if necessary and identify by block numoer)
Soil samples were exposed to neutron radiation from Shot Cherokee to help establish the
importance of neutron-induced residual qamma radiation. After exposure and recovery, the
samnles
had no detectable activity because the slant range to the nearest sample was nearly
3.5 miles, due to an error in bomb drop.
After this failure, an experiment was desiqned in
the field for Shot Yuma in order that induced-activity data could be obtained for a soil
other than Nevada Test Site sail.
Samples of sodium, manganese, and coral sand from Site
Sally were exposed above and below the surface at a slant range of 120 yards.
The difference between the effects of pure fission and fission-fusion neutron spectra on
induced activity in soil was not measured, since the soil samples on Shot Cherokee were not
activated.
However, a method for predicting neutron-induced gamma-radiation intensities was
tested for coral soil on Shot Yuma.
Predicted values were within + 50 percent af induced
dose rates inferred from field neasurements
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