Thermostimulated luminescence properties of CaSO₄:Dy and CaSO₄:Tm phosphors annealed at high temperatures

Abstract

Abstract Pre‐irradiation annealing at temperatures ≥800 °C in air drastically reduces the 230 °C dosimetric thermostimulated luminescence (TSL) peak in CaSO 4 :Dy/Tm and simultaneously the 60 °C and 120 °C peaks are strongly enhanced. In samples sintered at 1000 °C, the dosimetric peak vanished totally while the low temperature peaks exhibit a high TSL sensitivity. Moreover, the PL intensities decrease drastically on high temperature sintering; a reduction by as much as 75% is seen at 1000 °C. Photo‐transfer studies indicate that the 60 °C peak might originate from electron release while the 120 °C peak from hole release. These two low temperature TSL peaks could have potential applications for photostimulation. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)