Fabrication and Characterization of a Fiber-Optic Alpha/Beta Detector for Nuclear Medicine Application

Abstract We fabricated a fiber-optic alpha/beta detector, which is composed of a sensing probe, a plastic optical fiber, a photomultiplier tube,and a multichannel analyzer, to obtain the energy spectra of radioactive isotopes. As inorganic scintillators of a sensing probe, a ZnS(Ag)film was coupled with a CaF 2 (Eu) crystal for alpha and beta spectroscopy. In this study, 210 Po and 90 Sr were used as alpha and betasources, respectively, and we measured the radiation energy spectra using a fiber-optic alpha/beta detector to identify alpha and betaemitting radionuclides for nuclear medicine application. Also, the variations of energy spectrum were obtained according to the length ofplastic optical fiber. Keywords : Alpha/beta spectroscopy, Optical fiber, ZnS(Ag) film, CaF 2 (Eu) crystal, Nuclear medicine 
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