Radiation analysis method, radiation analysis device, and radiation detector

A radiation analysis method for identifying a plurality of kinds of radioactive nuclides simultaneously contained in a sample by measuring an energy spectrum of radiation emitted from the sample,

• the radiation analysis method including:
• defining a plurality of conditions that yield different detection intensities on a same measurement target as setting conditions, in a radiation detector for detecting the radiation;
• a sample measurement step of obtaining a measured spectrum that is an energy spectrum measured on the sample by the radiation detector;
• a background nuclide-originating component estimation step of estimating a background nuclide-originating component that is a component originating from a background nuclide corresponding to one of the nuclides having a largest contribution to the radiation, from results obtained by performing the measurement by the radiation detector under respective ones of the setting conditions;
• a corrected spectrum calculation step of calculating a corrected spectrum by subtracting the background nuclide-originating component from the measured spectrum;
• and
• performing analysis of the sample using the corrected spectrum.