Centre for Applied Physics and Radiation Technologies, School of Engineering and Technology, Sunway University, 47500, Bandar Sunway, Selangor, Malaysia.
Centre for Applied Physics and Radiation Technologies, School of Engineering and Technology, Sunway University, 47500, Bandar Sunway, Selangor, Malaysia; Department of Medical Sciences, School of Medical and Life Sciences, Sunway University, 47500, Bandar Sunway, Selangor, Malaysia.
Appl Radiat Isot. 2022 Aug;186:110271. doi: 10.1016/j.apradiso.2022.110271. Epub 2022 May 12.
In case of any natural disasters or technical failures of nuclear facilities, the surrounding media including human beings may receive unexpected radiation exposures. In such a situation, there is no viable way to know how much radiation dose is received by human beings. Realizing that motorized vehicles are parked at fixed but increasing distances within the nuclear installation and industrial environment, this study investigates the kinetic parameters of readily available car windscreens which form the basis to be employed in post-accident dose reconstruction or for retrospective dosimetry. To understand the luminescence features of this crystalline media, a convenient thermoluminescence (TL) technique has been employed. Several well-defined theoretical models and methods were employed to calculate the kinetic parameters including the order of kinetics (b), activation energy (E) or trap depth, frequency factor (s) or escape probability and trap lifetime (τ), by analyzing the glow curves of the irradiated samples. The analysed trapping parameters indicate that the Toyota (E = 0.75-1.31 eV, s = 3.0E+6 - 3.7E+9 (s), τ = 6.9E+5 - 1.3E+14 s) and Honda (E = 0.95-1.68 eV, s = 2.1E+10 - 4.1E+13 (s), τ = 2.2E+9 - 3.1E+20 s) windscreen offer promising features for conventional TL dosimetry applications, while the obtained longer lifetime (τ = 6.8E+10 - 8.6E+29 s) or higher activation energy (E = 1.23-2.15 eV) for Proton brand windscreen indicates better stability or slow fading of the material, thus suitable for retrospective TL dosimetry. In addition, by assessing the area of deconvoluted micro-Raman spectra of windshield glasses in high-frequency regions, it has been observed the phenomenon of dose-dependent structural alterations and internal annealing of defects. This pattern is also consistent with those cyclical pattern observed in the intensity ratio of defect and graphite modes in the studies of carbon-rich media. Such common phenomena indicate the possibility of using the Raman microspectroscopy as a probe of radiation damage in silica-based media.
在核设施发生任何自然灾害或技术故障的情况下,包括人类在内的周围介质可能会受到意外辐射照射。在这种情况下,无法知道人类接收到的辐射剂量是多少。鉴于机动车辆停放在核设施和工业环境中的固定但不断增加的距离内,本研究调查了现成汽车挡风玻璃的动力学参数,这些参数是事后剂量重建或回顾性剂量测定的基础。为了了解这种结晶介质的发光特性,采用了一种方便的热释光(TL)技术。通过分析辐照样品的发光曲线,采用了几种明确的理论模型和方法来计算动力学参数,包括动力学阶数(b)、激活能(E)或陷阱深度、频率因子(s)或逃逸概率和陷阱寿命(τ)。分析的俘获参数表明,丰田(E=0.75-1.31eV,s=3.0E+6-3.7E+9(s),τ=6.9E+5-1.3E+14s)和本田(E=0.95-1.68eV,s=2.1E+10-4.1E+13(s),τ=2.2E+9-3.1E+20s)挡风玻璃具有用于常规 TL 剂量测定应用的有希望的特性,而对于 Proton 品牌挡风玻璃,获得的较长寿命(τ=6.8E+10-8.6E+29s)或更高的激活能(E=1.23-2.15eV)表明该材料具有更好的稳定性或缓慢的衰减,因此适用于回顾性 TL 剂量测定。此外,通过评估挡风玻璃玻璃高频区域解卷积微拉曼光谱的面积,观察到了剂量依赖性结构变化和缺陷内部退火的现象。这种模式也与富碳介质中缺陷和石墨模式强度比研究中观察到的周期性模式一致。这种共同的现象表明,使用 Raman 微光谱作为基于二氧化硅的介质中辐射损伤的探针是可能的。