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NULL SPACE PROJECTION FOR SOURCELESS GAIN STABILIZATION IN DOWNHOLE GAMMA RAY SPECTROSCOPY
NULL SPACE PROJECTION FOR SOURCELESS GAIN STABILIZATION IN DOWNHOLE GAMMA RAY SPECTROSCOPY
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机译:井下伽玛射线光谱中无源增益稳定的空空间投影
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摘要
A method for gain control of a radiation detector includes measuring standard gamma ray spectra for known concentrations of selected radioactive materials found in earth formations. A standards matrix is calculated from the standard gamma ray spectra. A singular value decomposition is computed from a matrix related to measurements of gamma ray spectra, of formations and the standards matrix. A radiation, detector gain is computed from a minimum ratio of null space with respect to data value space of a subsurface formation measurement related matrix and the standards matrix. Gain of the radiation detector is adjusted based on the computed radiation detector gain.
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