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GEANT4 simulation study of over-response phenomenon of fiber x-ray sensor

Chinese Physics B 2021年第4期30卷 633-639页

作者： Bin Zhang Tian-Ci Xie Zhuang Qin Hao-Peng Li Song Li Wen-Hui Zhao Zi-Yin Chen Jun Xu elfed lewis Wei-Min Sun Key Laboratory of In-fiber Integrated Optics Ministry of EducationHarbin Engineering UniversityHarbin 150001China Electronic Engineering College Ministry of EducationHeilongjiang UniversityHarbin 150001China Comprehensive Cancer Center First Affiliated Hospital of Harbin Medical UniversityHarbin 150001China Comprehensive Cancer Center Second Affiliated Hospital of Harbin Medical UniversityHarbin 150001China Optical Fiber Sensors Research Centre University of LimerickCastletroyLimerickIreland

The purpose of this article is to explore the cause of the over-response phenomenon of fiber x-ray *** sensor is based on a length of PMMA fiber,whose end is filled with the scintillation material Gd_(2)O_(2)S:*** Monte Carlo simulation software GEANT4 uses the phase space file provided by the International Atomic Energy Agency(IAEA),by irradiating the fiber x-ray sensor in the water phantom,counting the fluorescence signal of the optical fiber x-ray sensor after propagation through the *** addition,the number of Cerenkov photons propagating through the fiber is also *** this article with previous research,we believe that one of the reasons for the over-response of the fiber x-ray sensor is the non-linear response of the deposition energy of the scintillator to the *** establishing a region of interest and counting the x-rays in this region,the simulation results show that the counted number of x-rays that may affect the fiber x-ray sensor is the biggest in the area of interest at a water depth of 5 *** result is close to the maximum dose point of the experimental and simulated percentage depth dose(PDD) curve of fiber x-ray ***,the second reason of the over-response phenomenon is believed to be fact that the inorganic materials such as Gd_(2)O_(2)S:Tb have larger effective atomic numbers,so the fiber x-ray sensors will cause more collisions with x-ray in a low energy region of 0.1 MeV-1.5 MeV.

关键词： fiber x-ray sensors over-response percentage depth dose(PDD) Monte Carlo(MC)simulation

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Ultra-high-resolution detection of Pb2+ ions using a black phosphorus functionalized microfiber coil resonator

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Photonics Research 2019年第6期7卷 622-629页

作者： YU YIN SHI LI SHUNBIN WANG SHIJIE JIA JING REN GERALD FARRELL elfed lewis PENGFEI WANG Key Laboratory of In-Fibre Integrated Optics of Ministry of Education College of Science Harbin Engineering UniversityHarbin 150001 China Photonics Research Centre Technological University DublinDublin Kevin Street Dublin 8 Ireland Optical Fibre Sensors Research Centre Department of Electronic and Computer Engineering University of LimerickLimerick Limerick V94 T9PX Ireland Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic Engineering Shenzhen University Shenzhen 518060 China

A black phosphorus(BP) functionalized optical fiber sensor based on a microfiber coil resonator(MCR) for Pb^2+ ion detection in an aquatic environment is presented and experimentally demonstrated. The MCR-BP sensor is manufactured by winding a tapered microfiber on a hollow rod composed of a low-refractive-index polycarbonate(PC) resin with the BP deposited on the internal wall of the rod. Based on the propagation properties of the MCR, the chemical interaction between the Pb^2+ ions and the BP alters the refractive index of the ambient environment and thus results in a detectable shift in the transmission spectrum. The resonance wavelength moves towards longer wavelengths with an increasing concentration of Pb^2+ ions, and the sensor has an ultra-high detection resolution of 0.0285 ppb(parts per billion). The temperature dependence is 106.95 pm/°C due to the strong thermo-optic and thermal-expansion effect of the low-refractive-index PC resin. In addition, the sensor shows good stability over a period of 15 days. The local pH also influences the sensor, with the resonance wavelength shift increasing as pH approaches a value of 7 but then decreasing as the pH value increases further due to the effect of the BP layer by H^+ and OH-ions. The sensor shows the potential for high-resolution detection of Pb^2+ ions in a liquid environment with the particular advantages of having a simple structure, ease of fabrication,low cost, low loss, and simple interrogation.

关键词： microfiber coil resonator black phosphorus

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放疗绝对剂量的数学算法模型

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物理学报 2021年第1期70卷 352-362页

作者：谢天赐张彬贺泊李昊鹏秦壮钱金钱石锲铭 lewis elfed 孙伟民哈尔滨工程大学物理与光电工程学院中国教育部纤维集成光学重点实验室哈尔滨150001 黑龙江大学电子工程学院哈尔滨150001 利莫瑞克大学光纤传感器研究中心利莫瑞克爱尔兰

本文提出一种通过物理模型计算放疗过程中每一个组织深度处绝对剂量的算法,它可代替蒙特卡罗仿真的部分工作且耗费时间更少.这个算法是基于对照射野内X射线产生电子的能量注量的积分运算,并考虑了射线的能谱及二次散射线,得到了后向散... 详细信息

本文提出一种通过物理模型计算放疗过程中每一个组织深度处绝对剂量的算法,它可代替蒙特卡罗仿真的部分工作且耗费时间更少.这个算法是基于对照射野内X射线产生电子的能量注量的积分运算,并考虑了射线的能谱及二次散射线,得到了后向散射对表面剂量的贡献比例,同时得到前向散射、后向散射及原射线剂量贡献的关系.比较了二次光子和二次电子的三维能谱,得出该能谱是粒子注量关于粒子能量和粒子运动方向的函数.为了得到每一深度处的光子注量,计算了有连续能谱的X射线的期望质量衰减系数.上述算法计算得到的绝对剂量与蒙特卡罗方式仿真的结果趋势一致,两者的差异在于算法未考虑高于二次的散射线.最后将算法应用到非均匀模体剂量计算,能准确反映其中剂量分布特点且具有较小的误差.

关键词：放疗模型绝对剂量康普顿效应

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光纤X射线传感器剂量衰减的仿真研究

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传感器与微系统 2024年第9期43卷 19-22页

作者：封勇贺泊杨浩杰耿涛 lewis elfed 孙伟民青岛市黄岛区人民医院山东青岛266400 哈尔滨工程大学纤维集成光学教育部重点实验室黑龙江哈尔滨150001 利默里克大学光纤传感器研究中心爱尔兰利默里克V94 T9PX

光纤X射线传感器由于其可实现实时在线剂量测量的特点而引起了广泛的关注。实验中采用Gd_(2)O_(2)S︰Tb作为闪烁体材料,利用蒙特卡罗仿真方法计算了两种嵌入不同尺度闪烁材料的光纤X射线传感器所导致的剂量衰减。并探讨了射野大小、水... 详细信息

光纤X射线传感器由于其可实现实时在线剂量测量的特点而引起了广泛的关注。实验中采用Gd_(2)O_(2)S︰Tb作为闪烁体材料,利用蒙特卡罗仿真方法计算了两种嵌入不同尺度闪烁材料的光纤X射线传感器所导致的剂量衰减。并探讨了射野大小、水深和闪烁体体积对剂量扰动的影响。结果表明:嵌入长7 mm,直径0.7 mm闪烁体的光纤X射线传感器在光纤后部表现出显著的剂量衰减,范围为深度5~10 mm。而嵌入长2 mm,直径0.4 mm闪烁体的光纤X射线传感器的剂量衰减被限制在光纤内部。光纤传感器的剂量衰减量与闪烁体的体积、射野大小和水深等因素有关,其中闪烁体的体积为主要影响因素。为了减少由于传感器带来的剂量衰减,在制作过程中应该限制嵌入光纤传感器内部的闪烁体体积。

关键词：放疗光纤X射线传感器剂量扰动蒙特卡洛仿真

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The Influences of an Embedded Structure Fiber-Optic Radiation Dosimeter in Different SSD and Beam Field Size

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Optics and Photonics Journal 2017年第8期7卷 75-80页

作者： Yaosheng Hu Zhuang Qin Yu Ma Chuntong Jiang Tianci Xie Wenhui Zhao Weimin Sun Daxin Zhang Ziyin Chen Boran Wang He Tian elfed lewis Key Lab of In-fiber Integrated Optics Ministry Education of China Harbin Engineering University Harbin China Comprehensive Cancer Center First Affiliated Hospital of Harbin Medical University Harbin China Harbin YIAOMI Technology Development Co. Ltd Harbin China College of Science Northeast Forestry University Harbin China Optical Fibre Sensors Research Centre University of Limerick Castletroy Limerick Ireland

With a rapidly increasing demand and widespread use of radiotherapy treatment, the subject area of in-vivo real time dose rate dosimeters has become a significant area of study. An embedded structure fiber-optic radiation dosimeter has proved to be a promising candidate to fulfil this role because of its high SNR (signal-to-noise ratio) and excellent light conversion efficiency. In this paper, the properties of this kind of dosimeter with respect to different SSD (Source to Surface Distance) and beam field size in a clinical Linac are studied. The characteristics of the dosimeter were evaluated by the sensor’s output intensity response in these conditions.

关键词： Optical Fiber Sensing Radiation SSD (Source to Surface Distance) Beam Field Size

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The Influences of Inorganic Scintillator Optical Fiber Radiation Dosimeter in Some Conditions

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Optics and Photonics Journal 2017年第8期7卷 81-85页

作者： Zhuang Qin Yaosheng Hu Yu Ma Wenhui Zhao Weimin Sun Tianci Xie Chuntong Jiang Daxin Zhang Ziyin Chen Boran Wang He Tian elfed lewis Key Lab of In-fiber Integrated Optics Ministry Education of China Harbin Engineering University Harbin China Comprehensive Cancer Center First Affiliated Hospital of Harbin Medical University Harbin China Harbin YIAOMI Technology Development Co. Ltd Harbin China College of Science Northeast Forestry University Harbin China Optical Fibre Sensors Research Centre University of Limerick Castletroy Limerick Ireland

In order to meet the increasing demands of modern radiotherapy, real time in-vivo dose measurement has recently attracted significant attention. A small, flexible optical fiber radiation dosimeter, with high signal-to-noise ratio (SNR) that employs inorganic scintillator materials is presented. In this paper, some properties are investigated under special conditions, such as saturation properties when the intensity of the X-Ray is increased and the influence of the temperature of the environment. These properties are important to practical considerations if the sensor is to be successfully deployed in-vivo.

关键词： Optical Fiber Sensor Radiation Dosimetry Inorganic Scintillator Materials

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