Feasibility of SiPM and CsI(Tl) based radiation detector with light guide for measurement of radioactivation in a linear accelerator

In this work, a prototype radiation detector was developed using SiPM, a large-sized CsI(Tl) scintillator, and various lengths of light guides, and its performance was evaluated. The conducted studies show that the tested prototype exhibited an enhanced energy resolution improved energy resolution when a 20 mm light guide was used, with respect to the case in which no light guide was employed. Additionally, the radiation detector demonstrated higher detection efficiency compared to other radiation detectors fabricated in this work. The radiation detector prototype under test and equipped with a 20 mm light guide, was used to perform a series of LINAC radioactivation measurements. These measurements resulted in the successful determination of the gamma energy peaks corresponding to W-187 and Mn-56, alongside the accurate measurement of the annihilation peak. These results suggest that the radiation detector employing a light guide for LINAC radioactivation measurements could be a viable alternative to conventional HPGe detectors or scintillation detectors without light guides.