A new luminescent material based on CaB6O10:Pb to detect radiation
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- 作者：Luiz C. Oliveira ; luizcarlosusp@gmail.com" class="auth_mail" title="E-mail the corresponding author ; Oswaldo Baffa
- 关键词：Optically stimulated luminescence ; Borate ; Thermoluminescence ; Dosimetry ; 2D dosimetry
- 刊名：Journal of Luminescence
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：181
- 期：Complete
- 页码：171-178
- 全文大小：950 K
文摘
This work describes the synthesis of a new photostimulable phosphors based on Pb-doped CaB6O10, and presents an investigation on its luminescence and dosimetric properties. The crystalline phase was confirmed by X-ray diffraction. We performed radioluminescence (RL), thermoluminescence (TL) and optically stimulated luminescence (OSL) measurements to determine the material׳s luminescence sensitivity as a function of Pb concentration, dose response to ionizing radiation, as well as the luminescence emission spectra, thermal stability of the luminescence signal, and lifetime of the associated luminescence centers. The results shows that the material is highly sensitive to ionizing radiation, comparable or surpassing commercially available luminescence materials such LiF:Mg,Ti and Al2O3:C, with a dominant TL peak at ~200 °C and an OSL signal that can be ~99% read within ~20 s under current experimental conditions. The RL, TL and OSL signals are dominated by an emission band at ~320 nm, probably associated with 3P1→1S0 transition of Pb2+. Although the optimum Pb concentration was 3 mol% (nominal concentration used for synthesis), high sensitivity was observed for Pb concentrations >0.1 mol%. The luminescence decays with a 0.55 μs and a 5.1 μs lifetime and the dose response was linear in the range investigated (~2 mGy–1 Gy). A signal fading of up to 50% within 8 days was observed, the majority of this fading taking place in the first 5 h (40%) following irradiation. This study shall motivate further fundamental investigations on this material, which may lead to an alternative OSL material for dosimetry.