Growth and structural study of bismuth germanate single crystal and its energy resolution

Bismuth germanate (Bi 4Ge 3O l2; BGO) single crystal has been grown by the Czochralski technique. High resolution X-ray rocking curves and transmission spectra were obtained for samples cut from shoulder, middle and bottom portions of the ampoule. The surface emission and excitation-emission spectrum were taken and the emission was found to have a peak at 480 nm. Energy resolution spectrum has been taken for a polished BGO sample with 137 Cs and 22 Na gamma sources. The reason for the formation of voids in the crystal and reduction of energy resolution is presented.