Abstract
Nuclear techniques for measuring the hydrogen content of coal are theoretically evaluated using the ANISN code. The results are verified by laboratory scale experiments using different coal samples from different mines in the U.S. New concepts based on the simultaneous application of two independent techniques have been studied. It is shown that the total hydrogen density in coal is best determined by measuring the ratio between the intensity of neutron capture gamma rays in hydrogen to the leakage flux of thermal or epithermal neutrons. An optimal geometry which minimizes the dependence of the system response on variations in the bulk density is calculated. The results of this study can be readily applied to other than coal materials and are especially useful when their composition is changing.
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