Patent ID: 7734447

Claim:
A radiation measurement apparatus comprising: a detecting section which comprises a plurality of detectors provided to have directivity characteristics that differ from each other, and which detects radiation with the detectors; a calculating section which calculates, based on a plurality of detection data obtained by the plurality of detectors and for each energy interval among a plurality of energy intervals, actual ratio information representing mutual ratios for a plurality of individual counts corresponding to the plurality of detectors; a generating section which generates, for each energy interval, a response function which provides theoretical ratio information which changes according to an incident direction; and a comparing section which compares a plurality of actual ratio information corresponding to the plurality of energy intervals with a plurality of response functions corresponding to the plurality of energy intervals, and identifies, when a matching relationship is determined between particular actual ratio information and particular theoretical ratio information, at least one of an incident direction and an energy interval for radiation detected by the detecting section based on the matching relationship.