Zhuang Qin, Yaosheng Hu, Yu Ma, Wenhui Zhao, Weimin Sun, Daxin Zhang, Ziyin Chen, Elfed Lewis
Opt Express. 2016 Mar 7;24(5):5172-5185. doi: 10.1364/OE.24.005172.
An investigation into a novel in-vivo PMMA (polymethyl methacrylate) plastic fiber-optic dosimeter for monitoring low doses of ionizing radiotherapy radiation in real time and for integrating measurements is presented. The fabricated optical fiber tip possessed an embedded structure. A scintillation material, terbium-doped gadolinium oxysulfide (GdOS:Tb), capable of emitting visible light at around 545 nm which is ideal for transmission through the PMMA when exposed to ionizing radiation was embedded in the PMMA plastic fiber. The dose rate of incident ionizing radiation is measured by analyzing the signal intensity emitted from the scintillation material which propagates through the fiber to a distal MPPC (multi-pixel photon counter). The dosimeter exhibits good repeatability with an excellent linear relationship between the fiber-optic dosimeter output and the absorbed radiation dose with an outstanding isotropic response in its radial angular dependence.
本文介绍了一种新型的体内聚甲基丙烯酸甲酯（PMMA）塑料光纤剂量计的研究，该剂量计用于实时监测低剂量电离放射治疗辐射并进行测量积分。制造的光纤尖端具有嵌入式结构。一种闪烁材料，掺铽的硫氧化钆（GdOS:Tb），当暴露于电离辐射时能够在545nm左右发射可见光，这种光非常适合通过PMMA传输，被嵌入到PMMA塑料光纤中。通过分析闪烁材料发出的信号强度来测量入射电离辐射的剂量率，该信号通过光纤传播到远端的多像素光子计数器（MPPC）。该剂量计具有良好的重复性，光纤剂量计输出与吸收辐射剂量之间具有出色的线性关系，并且在其径向角度依赖性方面具有出色的各向同性响应。
