The optical spectrum of this glass before irradiation exhibits both strong UV and near visible absorption extending from 200 to about 600 nm and showing six peaks at about 230. 320, 380,400 430 and 500 nm. The intensities of the near visible peaks is higher than that of UV peaks. On gamma irradiation, the UV absorption remains unchanged and a new induced band is observed at about 530 nm and the rest of the visible spectrum reveals lower intensity