Study of the Scintillation Properties and of the Proton-Induced Radiation Damage in the K2CeCl5 Single Crystal

Abstract
In this paper, we report on the scintillation properties of theK$_{2}$CeCl$_{5}$ single crystal before and after protonirradiation. The crystal of this scintillator was grown by using theCzochralski pulling technique and it was cut with dimension of 6$imes$ 4 $imes$ 3 mm$^{3}$. The scintillation properties, suchas the absolute light yield, the proportionality of the response andthe energy resolution, as functions of the $gamma$-ray energy werecalculated prior to the proton beam exposure. The light outputdeviates from a linear response by 10 \% in the energy range between31-keV and 1275-keV. Irradiation of the K$_{2}$CeCl$_{5}$ singlecrystal was carried out at the Korea Institute of Radiological andMedical Science. In order to measure the induced radiation damage inthe K$_{2}$CeCl$_{5}$ crystal, we subjected the sample to the 45-MeVproton beam of the MC-50 cyclotron and the scintillation propertieswere measured prior to and after the irradiation. The emissionspectra before and after the irradiation showed the same emissionband between wavelengths of 350 nm and 400 nm with a peak center at375 nm. After exposure to the proton beam, the K$_{2}$CeCl$_{5}$single crystal showed a lower light yield and a deteriorated energyresolution. In addition, we compared the decay time of the crystalbefore and after the proton irradiation.
Keywords: Radiation damage, Proton irradiation, Scintillation, K$_{2}$CeCl$_{5}$

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