Method of measuring radioactivity

摘要

The present invention relates to a method of measuring radioactivity which is suitable for discriminating between surface and internal contaminations of a body. The radioactivity of a subject is measured to obtain a gamma -ray energy spectrum of radioactivity signals obtained thereby, and a discrimination between surface and internal contamination of the subject is performed on the basis of the ratio between a photoelectric effect component and a Compton-scattered component of the gamma -ray energy spectrum. According to the present invention, surface and internal contaminations can be clearly identified.