Sk. Sahu et al., RADIATION HARDNESS OF UNDOPED BGO CRYSTALS, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 388(1-2), 1997, pp. 144-148
We measured the radiation hardness of undoped BGO crystals from two di
fferent manufacturers. Such crystals are proposed to be used in a smal
l-angle calorimeter of the BELLE detector of the KEK B-factory. Transp
arency and scintillation light output of the crystals were monitored t
o see the effect of radiation damage. The crystals shaw considerable r
adiation hardness up to 10.2 Mrad equivalent dose, which is much highe
r than the maximum expected dosage of 500 krad per year of running at
BELLE.