Computer Simulation of Nuclear Well Logging Tools <author> <version> <abstract> Nuclear well logging is a widely used technique in the oil and gas industry for analyzing the materials surrounding exploratory boreholes. A tool consisting of a neutron or gamma-ray source and one or more detectors is lowered into the borehole and measurements are recorded in a "log". The response of the detectors to radiation returning from outside the borehole depends upon the lithology, porosity, and fluid characteristics of the material. In principle, the characteristics of the materials outside the borehole can be inferred from the response of the detectors. <description><url>http://www.llnl.gov/liv_comp/meiko/apps/dorr/ardra.html</url> <reference><url></url> <contact>Milo R. Dorr / dorr@llnl.gov <keywords>simulation; application program <category>application <publication-date>01 November 1994 <environment> <method> <comments> </urc>