The pre-dose effect in crystalline quartz

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Abstract
In the authors' previous work data have been presented which indicate that thermoluminescence (TL) at 110 degrees C in crystalline quartz is due to the recombination of electrons released from (GeO4)- centres with holes trapped at (AlO4)0 centres and at unidentified hole traps. In this paper new results are presented which identify the latter defect with (H3O4)0 centres. These defects are seen to anneal in exactly the same fashion as the (AlO4)0 centres during the production of TL at 110 degrees C, and are seen to sensitise slightly when pre-exposed to radiation and subsequently heated to near 400 degrees C. The effects of high temperature and pre-irradiation annealing on the pre-dose thermal activation curves are also examined. The data show that if a quartz sample is only partially 'fired', i.e. heated only to moderate temperatures (300-450 degrees C, rather than the usual 950-1000 degrees C), then a large sensitivity increase is observed during the thermal activation curve measurement which is not due to pre-dose sensitisation . This effect may have important consequences in pre-dose dating and dosimetry.

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