AbstractAssemblies have been built for measuring gamma rays from coal following the capture of neutrons from252Cf. Sources of sizes to 60μg of calcium 1.4×108n/s were used. Paraffin moderated the fast neutrons, and beryllium metal was useful as a reflector. The gamma-ray spectrum from a Ge(Li) detector showed that the line intensities of a number of elements (e.g., hydrogen, iron, sulfur, and silicon) could be used to determine concentrations. The aim was to explore possible application in planned coal conversion plants.