评估 TL 和 OSL 剂量计的剂量率效应:对剂量率模型的批判性研究

IF 1.6 3区 物理与天体物理 Q2 NUCLEAR SCIENCE & TECHNOLOGY
S. Motta, E.G. Yukihara
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引用次数: 0

摘要

这项研究通过求解受激发光过程的速率方程,从理论上研究了热致发光(TL)和光致发光(OSL)材料中可能存在的剂量率效应。从使用文献中的参数求解 "一个俘获-一个重组-中心"(OTOR)模型开始,我们首先证明了该模型与所选参数不能再现真实的发光材料特性(如 TL 曲线和剂量响应)。然后,我们研究了该模型中造成剂量率效应的物理现象,以及模型参数对剂量率响应的影响。结果我们发现,电荷在不切实际的长周期(数百秒)内聚集在分散带中是造成剂量率效应的原因。这种效应是由特定的模型参数选择造成的。如果根据物理因素和实验结果选择模型参数,则不会观察到剂量率效应。这项研究通过确定可能导致剂量率效应的机制,加深了对发光过程的理解,并为将发光探测器用于超高剂量率剂量测定奠定了理论基础。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Assessing dose rate effects in TL and OSL dosimeters: A critical look into dose rate models
This work investigates theoretically possible dose rate effects in thermoluminescence (TL) and optically stimulated luminescence (OSL) materials by solving the rate equations for the stimulated luminescence process. Starting with the solution of the One-Trap–One-Recombination-Center (OTOR) model with parameters from the literature, we first showed that this model, with the chosen parameters, does not reproduce real luminescent material properties (e.g., TL curve and dose response). We then studied the physical phenomena responsible for dose rate effects in this model, and the influence of the model parameters on the dose rate response. As a result, we found that charge accumulation in the delocalized bands over unrealistic long periods (> hundreds of seconds) is responsible for dose rate effects. Such effect is caused by the particular choice of model parameters. When model parameters based on physical considerations and experimental results are chosen, no dose rate effects are observed. This work provides a deeper understanding of the luminescence process, by identifying the mechanisms that could be responsible for dose rate effects, and a theoretical foundation to the use of luminescent detectors for ultra-high dose rate dosimetry.
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来源期刊
Radiation Measurements
Radiation Measurements 工程技术-核科学技术
CiteScore
4.10
自引率
20.00%
发文量
116
审稿时长
48 days
期刊介绍: The journal seeks to publish papers that present advances in the following areas: spontaneous and stimulated luminescence (including scintillating materials, thermoluminescence, and optically stimulated luminescence); electron spin resonance of natural and synthetic materials; the physics, design and performance of radiation measurements (including computational modelling such as electronic transport simulations); the novel basic aspects of radiation measurement in medical physics. Studies of energy-transfer phenomena, track physics and microdosimetry are also of interest to the journal. Applications relevant to the journal, particularly where they present novel detection techniques, novel analytical approaches or novel materials, include: personal dosimetry (including dosimetric quantities, active/electronic and passive monitoring techniques for photon, neutron and charged-particle exposures); environmental dosimetry (including methodological advances and predictive models related to radon, but generally excluding local survey results of radon where the main aim is to establish the radiation risk to populations); cosmic and high-energy radiation measurements (including dosimetry, space radiation effects, and single event upsets); dosimetry-based archaeological and Quaternary dating; dosimetry-based approaches to thermochronometry; accident and retrospective dosimetry (including activation detectors), and dosimetry and measurements related to medical applications.
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