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 NaSrBO₃phosphor was synthesized by conventional solid state method and its thermoluminescence response against γ-ray and heavy ion (120 MeV Ag⁹⁺) exposure was investigated. The investigations were done in the range of 0.01–5 kGy and 1 × 10¹¹–1 × 10¹³ions cm⁻²for γ-ray and heavy ions, respectively. The glow curves of the phosphor displayed different shapes for different irradiation sources (i.e. γ-ray and heavy ions). The γ-ray irradiated glow curves all mainly consisted of two peaks, namely a low temperature peak, T_m1∼410 ± 5 K and a high temperature peak, T_m2∼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 γ-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 γ-ray dosimetric applications for the dose range of 0.01–5 kGy.