Abstract
Thermoluminescence (TL) glow, thermoluminescence emission (TLE) and thermal decay (TD) of optical absorption (OA) bands were studied on γ-irradiated CaF 2:Dy (0.010at.%):Pb (0.188at.%):Na (0.026at.%) single crystals (hereafter called crystal-I). The TL glow exhibited four glow peaks in the temperature region 300–600 K. The TL response with dose was studied up to ∼7.5 kGy. The total glow showed linear, supra linear and exponential growth with dose. The TLE showed bands characteristic of Dy 3+ ions (around 1.65, 1.87, 2.18 and 2.63 eV) and sodium associated (SA) colour centres (CCs) such as M Na (around 1.67 eV) and X Na (a new SA CC, with an emission band around 2.63 eV). The OA bands of M Na CC around 3.23 and 2.07 eV were found to decrease with temperature almost in accordance with the TL glow. The R + A centre absorption around 2.48 eV was found to grow with temperature initially and then decayed. The formation/growth of the CCs R + A and X Na might be from the conversion of the irradiation produced CC M Na. An attempt was made to explain the TL mechanism in the present system.
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