Copper-doped glass
This Cu-doped glass reveals strong UV absorption with four peaks at 235, 310, 350 and 380 nm followed by a stronger band with peak at 470 and an attached medium broad band centered at about 740 nm. Upon gamma irradiation, the UV absorption remains unchanged up to 500 nm and a new high intense broad band is resolved at 550 and the intensity of the broad band at 740 nm decreases in intensity.