Abstract
In this article, thermoluminescence (TL) studies on a Sm3+ doped SrB4O7 compound irradiated by an electron beam are reported for the first time. The polycrystalline powder samples of SrB4O7:Sm phosphor were prepared by a solid-state reaction in air at high temperature, and the TL glow curves and TL emission spectra after electron beam irradiation were studied from 50 to 250 kGy dose range. The TL studies of the Sr0.93Sm0.07B4O7 sample show the main TL glow peak at 224 °C, which has a great stability for a long time. The trap parameters, namely, the activation energy (E), the order of kinetics (b) and the frequency factor (s) of the main peak were determined using glow curve shape (Chen's) methods. The distributions of traps produced by the irradiation by an electron beam can be altered greatly by the change of the concentration of Sm3+ ions in the SrB4O7 host. Then, all peak temperatures shift to higher temperatures which this will be favorable for better TL output. The TL-dose response of the SrB4O7:Sm polycrystalline powder sample to electron beam radiation in the range from 50 to 250 kGy for radiation processing dose levels is almost linear. The experiment results showed that SrB4O7:Sm has a potential use as a material for electron beam thermoluminescence dosimetry.
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