Abstract
We report on a study of the correlation between radiation damage of bismuth germanate (BGO) scintillator crystals and trace impurities in the crystal. The light yield and the absorption spectra of doped BGO crystals were measured, both before and after irradiation. While trace concentrations of Cr, Mn, Fe and Pb in BGO were found to lead to substantial radiation damage, traces of Al, Ca, Cu and Si were found to have no measurable effect. Traces of Co, Ga, Mg and Ni were found to have an effect intermediate between the above two groups. Three radiation-induced absorption bands were observed in a set of BGO crystal samples. Their energy levels were found to be independent of the trace elements in the BGO. They are at 2.3±0.1, 3.0±0.1 and 3.8±0.1 eV, respectively, above the valence band. A brief discussion of the radiation damage mechanism in BGO is presented.
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