Neutron-Induced Soil Radioactivity
SANDIA CORP ALBUQUERQUE NM
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Soil samples were exposed to neutron radiation from Shot Cherokee to help establish the importance of neutron-induced residual gamma radiation from a large-yield thermonuclear air burst. After exposure and recovery, the samples 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 designed in the field for Shot Yuma in order that induced-activity data could be obtained for a soil other than Nevada Test Site NTS soil. Samples of sodium, manganese, and coral sand from Site Sally were exposed above and below the surface at a slant range of 120 yards. At this same ation, gamma dose rates were measured and neutron detectors were exposed by Project 2. 51. The full-field gamma radiation measured was due to a combination of fission-product and neutron-induced activities, the only important induced activity being due to Na23n,lambda Na24. At 1.1, 3.4, and 10.9 hours after zero time, neutron-induced gamma radiation accounted for 1.2, 1.1, and 0.8 rhr of the measured 6.0, 2.2, and 1.2 rhr. These values were found to be within 50 percent of neutron-induced dose rates.
- Soil Mechanics
- Radioactivity, Radioactive Wastes and Fission Products
- Nuclear Weapons