%A"Tewes, H A [Lawrence Radiation Laboratory, Livermore, CA (United States)]" %D1969 %I; U.S. Department of Health, Education, and Welfare, Public Health Service, Consumer Protection and Environmental Health Service, Environmental Control Administration (United States) %2Southwestern Radiological Health Laboratory, Bureau of Radiological Health (United States) %J[] %K58 GEOSCIENCES, AMBIENT TEMPERATURE, CONTAMINATION, CRUSHING, FISSION NEUTRONS, MEV RANGE 10-100, MINING ENGINEERING, NEUTRON SOURCES, NUCLEAR EXPLOSIVES, ROCKS, TRITIUM, UNDERGROUND %PMedium: ED; Size: page(s) 207-222 %TRadioactivity source terms for underground engineering application %XThe constraints on nuclide production are usually very similar in any underground engineering application of nuclear explosives. However, in some applications the end product could be contaminated unless the proper nuclear device is used. This fact can be illustrated from two underground engineering experiments-Gasbuggy and Sloop. In the Gasbuggy experiment, appreciable tritium has been shown to be present in the gas currently being produced. However, in future gas stimulation applications (as distinct from experiments), a minimum production of tritium by the explosive is desirable since product contamination by this nuclide may place severe limitations on the use of the tritiated gas. In Sloop, where production of copper is the goal of the experiment, product contamination would not be caused by tritium but could result from other nuclides: Thus, gas stimulation could require the use of fission explosives while the lower cost per kiloton of thermonuclear explosives could make them attractive for ore-crushing applications. Because of this consideration, radionuclide production calculations must be made for both fission and for thermonuclear explosives in the underground environment. Such activation calculations materials of construction are performed in a manner similar to that described in another paper, but radionuclide production in the environment must be computed using both fission neutron and 14-MeV neutron sources in order to treat the 'source term' problem realistically. In making such computations, parameter studies including the effects of environmental temperature, neutron shielding, and rock types have been carried out. Results indicate the importance of carefully evaluating the radionuclide production for each individual underground engineering application. (author) %0Conference %NINIS-XA-N-193; PB-187349; SWRHL-82;TRN: XA04N2190015891 %1 %CIAEA %Rhttps://doi.org/ TRN: XA04N2190015891 INIS %GEnglish