光纤X射线传感器剂量衰减的仿真研究  

Simulation study on dose attenuation in optical fiber X-ray sensors

作　　者：封勇[1] 贺泊 杨浩杰 耿涛 LEWIS Elfed 孙伟民[2] FENG Yong;HE Bo;YANG Haojie;GENG Tao;Elfed LEWIS;SUN Weimin(Qingdao Huangdao District People’s Hospital,Qingdao 266400,China;Key Laboratory of In-Fiber Integrated Optics of Ministry of Education,Harbin Engineering University,Harbin 150001,China;Optical Fiber Sensors Research Centre,University of Limerick,Limerick V94 T9PX,Ireland)

机构地区：[1]青岛市黄岛区人民医院,山东青岛266400 [2]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 [3]利默里克大学光纤传感器研究中心,爱尔兰利默里克V94 T9PX

出　　处：《传感器与微系统》2024年第9期19-22,共4页Transducer and Microsystem Technologies

摘　　要：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。Fiber-optic X-ray sensors have attracts widespread attention due to their ability to achieve real-time and online dose measurement.Gd_(2)O_(2)S:Tb is used as scintillating material in the experiment,and Monte Carlo simulation method is used to calculate the dose attenuation caused by two fiber-optic X-ray sensors embedded with different scale of scintillating materials.And the effects of field size,water depth,and scintillating volume on dose disturbance are explored.The results show that the fiber-optic X-ray sensor embedded with scintillator with length of 7 mm and diameter of 0.7 mm exhibits significant dose attenuation at the rear of the fiber-optic,with a reduction range of depth from 5mm to 1mm.The dose attenuation of the fiber-optic X-ray sensor embedded with a scintillator with length of 2 mm and diameter of 0.4 mm is limited to the inside of the fiber.The dose attenuation of fiber-optic sensors is related to factors such as the volume of the scintillator,field size,and water depth,of which,volume of the scintillator is the main influencing factor.In order to reduce dose attenuation caused by sensors,volume of scintillators embedded inside the fiber-optic sensor should be limited during manufacturing process.

关 键 词：放疗 光纤X射线传感器 剂量扰动 蒙特卡洛仿真 

分 类 号：TL812[核科学技术—核技术及应用] TP212[自动化与计算机技术—检测技术与自动化装置]