Abstract
Abstract The changes in the glow curve shape of CaSO4: Dy phosphor induced by gamma radiation in dose region 0.1 Gy-2.6 × 105 Gy were studied. With increase in gamma dose, initially, the glow curve shows a rapid increase in its peak width followed by its decrease with subsequent increase in gamma dose. This variation in peak width has been found to be due to the rapid growth and shift (towards lower temperatures) of a shoulder located at about 340°C for low doses. The shift and growth of the shoulder has been explained by preferential filling, first, of deeper trap components followed by filling of shallower trap components. In addition, for doses above 2 Gy, a high temperature peak distribution, peaking around 420°C, is noted.
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