Radiation hardness of PbWO 4 Cherenkov radiators heavily doped with trivalent rare-earth ions

Abstract

PbWO 4 single crystals heavily doped with trivalent rare-earth (RE) ions were proposed a few years ago as one of the heaviest Cherenkov radiators. We have found that their radiation damage due to 60Co γ-rays are almost saturated at 10 3 Gy (1 Gy=100 rad). The radiation-induced absorption coefficient μ ir at 420 nm slightly above the short-wavelength cutoff was 3.1, 5.4 and 7.2 m −1 at 10 5 Gy in PbWO 4:Gd 3+(3 at%), PbWO 4:La 3+(5 at%) and PbWO 4:La 3+(8 at%), respectively.