Investigation of thermoluminescence response and trapping parameters of 120 MeV Ag9+ and γ-ray exposed NaSrBO3:Dy3+ phosphor for dosimetry

Trivalent dysprosium (Dy3+) ion activated NaSrBO3 phosphor was synthesized by conventional solid state method and its thermoluminescence response against gamma-ray and heavy ion (120 MeV Ag9+) exposure was investigated. The investigations were done in the range of 0.01-5 kGy and 1 x 10(11)-1 x 10(13) ions cm(-2) for gamma-ray and heavy ions, respectively. The glow curves of the phosphor displayed different shapes for different irradiation sources (i.e. gamma-ray and heavy ions). The gamma-ray irradiated glow curves all mainly consisted of two peaks, namely a low temperature peak, T-m1 similar to 410 +/- 5 K and a high temperature peak, T-m2 similar to 550 +/- 4 K while for the ion exposed phosphors, the glow curves were more complex in nature and the shape of the glow curve was affected by fluence. The response curves for the low temperature peak displayed almost linear response against the gamma-ray exposure. The trapping parameters (i.e. activation energy, frequency factor, order of kinetic) calculated by Chens relation demonstrated that our material may be a good candidate for gamma-ray dosimetric applications for the dose range of 0.01-5 kGy. (C) 2016 Elsevier B.V. All rights reserved.