Claim: Prompt gamma neutron activation analysis measures using a gamma ray spectrometer, an instrument also used for analysis of elemental bodies in the Solar System.
Evidence: The constituent elements of the sample absorb some of these neutrons and emit prompt gamma rays which are measured with a gamma ray spectrometer. Gamma-ray spectrometers have been widely used for the elemental and isotopic analysis of bodies in the Solar System, especially the Moon and Mars.