Radiation damage of doubly doped PbWO4:(Mo,A3+) scintillator

Radiation-induced absorption spectra were measured to study the influence of trivalent ion codoping (Y, La) on radiation hardness of PWO:Mo scintillators and to compare samples coming from two different laboratories. It follows from the experiments that trivalent ion codoping significantly reduces the induced absorption coefficient of PWO:Mo. At the same time, the shape of induced absorption spectra becomes more complicated and even bleaching of absorption after irradiation was observed in Y-codoped samples in the spectral region round 420 nm. When comparing Y and La-codoped samples, the positive effect of La is much less significant than that of Y. Also, no absorption bleaching round 420 nm after irradiation was found in the latter case