Abstract
Different types of color centers are present in aluminoborate glass. Some of these are related to impurities, others are possibly due to defects in the glass structure. Radiation induced bands at 520 and 340 mμ are attributed to hole centers. The Fe3+ and Pb2+ ions present as impurities in a normal melt of aluminoborate glass act as electron traps, while Fe2+ ions and Pb0 (atoms) present in a reduced glass act as hole traps. The reduction of Fe3+ ions to Fe2+ ions results in decrease of uv absorption around 220 mμ. On heating the irradiated glass thermoluminescence along with bleaching of color centers were observed and the relation between the two processes was investigated. Glow peaks were observed at 60°±5°C, 165°±10°C, and 210°±5°C. The high-temperature glow peak is observed only at high gamma-ray exposures (∼107 R).
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