Determination of the kinetic parameters of BeO luminescent material using different methods towards X-ray irradiation

Abstract

In this work, the thermoluminescence (TL) and optically stimulated luminescence (OSL) kinetics of a recently developed beryllium-oxide dosimeter (BeOR) were studied with different methods. The TL and OSL dose responses were also established for an X-ray dose interval of 2–10 Gy. The TL kinetic parameters were determined using three methods, namely: the peak shape (PS), the first-order kinetics (FOK) using Glow-Fit, and the general-order kinetics (GOK) using computerized glow-curve deconvolution (CGCD). TL glow curves of the irradiated BeOR show two distinct TL experimental peaks at ∼250 and ∼379 °C under a heating rate of 5 °C/s. The PS method demonstrates a kinetics order of about two (∼2) for the first peak, whereas the second peak follows first-order kinetics. The activation energies resulting from PS method range from 0.98±0.03 to 1.01±0.05 eV for the first peak and from 1.56±0.07 to 1.58±0.08 for the second peak. The FOK-Glow-Fit show three deconvolution peaks (1.02, 1.05, and 1.07 eV) for the first TL experimental peak and one peak (1.94 eV) for the second experimental peak. The GOK-CGCD method reveals three peaks of ∼1.04, 1.6 (experimental peak1), and ∼2.1 eV (experimental peak2). The TL kinetic parameters were established and compared for the three considered methods. Based on the TL kinetics study, OSL kinetics parameters of BeOR were also determined. The established TL and OSL dose responses of studied dosimeter show linear behaviour that allow effective dosimetry application in photon radiotherapy.