radioisotope induced X-ray emission analysis 

https://doi.org/10.1351/goldbook.R05110
A kind of analysis based on the measurement of the energies and intensities of characteristic X-radiation emitted by a test portion during irradiation with a radioactive source.
Source:
PAC, 1994, 66, 2513. (Nomenclature for radioanalytical chemistry (IUPAC Recommendations 1994)) on page 2526 [Terms] [Paper]