Desirable scintillation properties of BGO such as high density, short radiation length, non-hygroscopic, average values of light output & energy resolution and scintillation decay time, make it attractive for applications in various fields of science and technology, especially in high energy physics [6,7]. The reported light yield (LY) for BGO has gradually increased from about 6900 up to 8600 photons per MeV (ph/MeV) [8–11] due to improving crystal quality. The intermediate value of LY at room temperature is due to thermal quenching of the emission center well documented in earlier studies which shows the onset within 200–250 K [1,2,5]. It is worth also noting its negligible afterglow in millisecond time scale [2]. High LY of 23,000 ph/MeV and good energy resolution of 6.5% at 662 keV c-rays have been recorded for the BGO at liquid nitrogen temperature (77 K) [9].