Effect of residual thermoluminescence on the radiation induced sensitization of some TL phosphors

Abstract

The effect of the high temperature residual TL (RTL) peak on the sensitization of the dosimetric peak in CaSO₄ : Dy, CaSO₄ : Tm and CaF₂ : Dy phorphors was studied and it was found that the sensitization factor (S/S₀) is dependent on the intensity of the RTL peak. On bleaching the RTL peak intensity by a factor of ∼16 by means of intense UV irradiation (253.7 nm), it was possible to bring down the sensitization factor for CaSO₄ : Dy from a value of 2.6 to 1.0. A similar effect has also been observed in CaSO₄ : Tm and CaF₂ : Dy phosphors. The shape and also the position of the main dosimetric peak is dependent on the intensity of the RTL peak.