Author/Authors :
Bondar، نويسنده , , V.G. and Burachas، نويسنده , , S.F. and Katrunov، نويسنده , , K.A. and Martinov، نويسنده , , V.P. and Ryzhikov، نويسنده , , V.D. and Manko، نويسنده , , V.I. and Gutbrod، نويسنده , , H.H. and Tamulaitis، نويسنده , , G.، نويسنده ,
Abstract :
Absorption induced in PbWO4 and CdWO4 scintillation crystals by UV and γ-ray irradiation was investigated by observing the dynamics of the absorption spectra after the irradiation of the samples with quanta of different energies and time evolution of the darkening effect at different rates of the irradiation. Dependence of the irradiation-induced absorption on growth conditions of the crystals, as well as bleaching of the samples by heating and illumination with visible light were studied. Trapping of free carriers at structural defects related with oxygen content in the lattice was shown to result in the creation of color centers in both tungstates under investigation.
Keywords :
Scintillation detectors , CWO , PWO , Photochromic effect , optical absorption , Radiation hardness
