Feasibility Study on Development of a Fiber-Optic Dual Detector to Measure Beta- and Gamma-rays Simultaneously

Abstract

-A fiber-optic beta/gamma dual detector system with two types of sensing probes was fabricated to detect the beta-and gamma-rays simultaneously. As scintillators of the sensing probe type 1, two different inorganic scintillators, CaF2(Eu) and LYSO(Ce) crystals, were used to obtain the each scintillating efficiency with respect to betaand gamma-rays and the inherent energy spectra of radioactive isotopes. In the case of the sensing probe type 2, which is composed of two identical inorganic scintillators and a beta shielding material based on the lead, it could discriminate beta-and gamma-rays using a subtraction method. In conclusion, we demonstrated that the proposed fiber-optic beta/gamma dual detector could measure and discriminate beta-and gamma-rays using both energy spectroscopy and subtraction method.Key Words : Fiber-optic detector, Beta-ray, Gamma-ray, CaF2(Eu) cryatal, LYSO(Ce) cryatal

Development and Comparison of Fiber-Optic Beta Radiation Sensors with Different Diameters of Their Sensing Probes

“…Kim et al developed a ZnS(Ag)/BC-408 phoswich detector for monitoring radioactive contamination inside pipes [8]. Hong et al developed a fiber-optic dual detector to measure beta-and gamma-rays simultaneously [9].…”