Radiation-induced color centers in La-doped PbWO4 crystals

This report presents the result of a study on radiation-induced color center densities in La-doped lead tungstate (PbWO4) crystals. The creation and annihilation constants of radiation-induced color centers were determined by using transmittance data measured for a PbWO4 sample before and during 60Co γ-ray irradiation at a dose rate of 15 rad/h. Following a model of color center kinetics, these constants were used to calculate color center densities under irradiations at 100 rad/h. The result was found to be in good agreement with experimental data, indicating that the behaviour of PbWO4 crystals under irradiation can be predicted according to this model.