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Fiber optic probes based on silver-only coated hollow glass waveguides for ionizing beam radiation dosimetry

机译:基于纯银涂层的中空玻璃波导的光纤探头,用于电离束辐射剂量测定

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摘要

Cerenkov contamination is a significant issue in radiation detection by fiber-coupled scintillators. To enhance the scintillation signal transmission while minimizing Cerenkov contamination, we designed a fiber probe using a silver-only coated hollow waveguide (HWG). The HWG tip with inserted scintillator, embedded in tissue-mimicking phantoms, was irradiated with clinical electron and photon beams. Optical spectra of irradiated tips were taken using a fiber spectrometer, and the signal was deconvolved with a linear fitting algorithm. The resultant decomposed spectra of the scintillator with and without Cerenkov correction were in good agreement with measurements performed by an electron diode and ion chamber for electron and photon beam dosimetry, respectively, indicating the minimal effect of Cerenkov contamination. Compared with a silver/dielectric coated HWG fiber dosimeter design we observed higher signal transmission in our design based on the use of silver-only HWG.
机译:切伦科夫污染是光纤耦合闪烁体在辐射检测中的重要问题。为了增强闪烁信号的传输,同时最大程度地减少切伦科夫污染,我们设计了一种仅使用镀银的空心波导(HWG)的光纤探头。用临床电子束和光子束辐照具有嵌入闪烁体的HWG尖端,该闪烁体嵌入组织模拟体模中。使用光纤光谱仪获取被辐照尖端的光谱,并使用线性拟合算法对信号进行解卷积。具有和不具有切伦科夫校正的闪烁体的最终分解光谱分别与电子二极管和离子室分别进行的电子和光子束剂量测定所进行的测量吻合,表明切伦科夫污染的影响最小。与采用银/介电涂层的HWG光纤剂量计设计相比,我们在基于纯银HWG的设计中观察到了更高的信号传输。

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