THE RESPONSE OF THE HPGE DETECTOR FOR A NUMBER OF RADIOACTIVE ISOTOPES OF U-238, TH-232, K-40 AND COSMIC-RAY MUONS BY GEANT4 SIMULATION

Abstract

In this work, we study the response of the HPGe detector for a number of radioactive isotopes of U-238, Th-232, K-40 and cosmic-ray muons by Geant4 simulation toolkit. The size of detector HPGe and of lead chamber are referenced from Canberra Industries. Sources U-238, Th-232, K-40 which emitted gamma radiation with angular distributions of 4π, are parallelepiped sources, and they positioned inside a lead chamber, at a distance of 59,76 mm from detector. This cosmic-ray muons which have the beam with energy of 450 MeV, shooting direction is perpendicular to detector’s surface. Energy spectrum of each radioisotope is studied separate survey and the results is correct with theory of interacting of gamma with detector HPGe. Beside, the effect of self-absorption of the matter is also mentioned in the results of this article.
Keywords: Geant4, HPGe GC2018, muon-450 MeV.