Monte Carlo calculations have been made in an attempt to evaluate the effects of such perturbations as “reactor poisons,” washouts in the borehole or holes in the medium, and large variations in the chemistry and density of the medium on several techniques for the measurement of in‐situ hydrogen content [Formula: see text] with epithermal neutrons. A density ρ range of 1.0 to [Formula: see text] was examined. In a series of parameter studies, the epithermal neutron flux in three detectors ([Formula: see text], [Formula: see text], and [Formula: see text]) was calculated for a disk geometry, and compared to a few more realistic calculations in a cylindrical geometry. Several combinations of calculated fluxes give reasonable fits to analytical expressions. With air in the borehole, the best fits were obtained to [Formula: see text]and[Formula: see text]With water, the best fits were to [Formula: see text]and[Formula: see text]The results were compared to those from Tittman’s sidewall epithermal‐neutron log. No serious disagreement was found.
Subcellular S-factors for low-energy electrons: A comparison of Monte Carlo simulations and continuous-slowing-down calculations
