RADIOACTIVITY ABSOLUTE MEASURING APPARATUS USING QUANTITY-OF-HEAT DETECTOR AND PHOTODETECTOR

摘要

PROBLEM TO BE SOLVED: To facilitate performing radioactivity absolute measurement without dependence on nuclear data on a radiation source that does not emit or hardly emits a gamma ray and that emits an alpha ray and a beta ray, on which the radioactivity absolute measurement is conventionally difficult to perform.SOLUTION: A radioactivity absolute measurement apparatus comprises: a scintillator 110 for airtight closing a measurement target radiation source 100; an adhesive 120; a quantity-of-heat detector 130 connected to the scintillator 110; and a photodetector 140 installed near the scintillator 110, and a radioactivity absolute value of the measurement target radiation source 100 is obtained using a counting rate by the quantity-of-heat detector 130, a counting rate by the photodetector 140, and a simultaneous counting rate by the quantity-of-heat detector 130 and the photodetector 140.