Abstract
Abstract Measurements have been made of gamma ray spectra generated by the interaction of neutrons with the elements in simulated infinite media of limestone, sandstone, and dolomite. All spectra were obtained with germanium detectors to identify both major and minor constituents of the rock. Three different neutron sources were used in this study: 14 MeV and 2.5 MeV accelerator sources and a 252Cf chemical source. The delayed activation spectra were primarily used to identify the elemental constituents of the media. The prompt gamma-ray spectra due to neutron inelastic scattering, neutron-induced particle reactions, and thermal neutron capture were obtained at different spacings from the neutron source. These data provide insight into the combined problem of neutron and gamma-ray transport in materials of interest in oil well logging. In addition they serve as benchmarks for comparison with the results of modeling codes ultimately intended for use in problems with realistic geometries.
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