Abstract
X-ray induced luminescence (radioluminescence or RL) in the visible range, thermally stimulated luminescence (thermoluminescence or TL), and X-ray induced optical damage and its bleaching are studied in nominally pure Bi 12 TiO 20 crystals within the temperature range 12 to 330 K. A single emission band of complex shape is observed at 495 nm in the RL spectra and its behaviour with dose and temperature is studied. This band is proposed to have an intrinsic origin. The optical absorption induced by X-ray irradiation shows a broad band in the visible region similar to those reported for Bi 12 GeO 20 and Bi 12 SiO 20 , but presents a different behaviour with the temperature of irradiation. This absorption structure is proposed to be related to holes trapped at the oxygen sublattice.
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