This work aims to develop and characterize a mathematical algorithm for the temperature compensation of the fiber Bragg grating dosimeter and study of the effect of cumulative radiation dose on the Bragg wavelength shift (BWS). Studies on the BWS and the influence on the thermo-optic response coefficient of FBGs caused by the Co-60 gamma irradiation are performed. The BWS shows a linear dependence on temperature, and the inherent thermo-optic coefficients of the FBGs range from 10.1 to 24.0 pm/°C. The thermo-optic coefficient of FBGs is measured immediately after every 2-h irradiation. It turns out that the thermo-optic coefficient is not affected by the cumulative radiation dose and the fluctuation caused by radiation is under 2.2%. The BWS caused by 6.75 kGy gamma rays in 15 h shows a linear increase after correcting the interference of temperature. The radiation-induced coefficient is 5.18 pm/kGy and the lowest cumulative dose detection limit can be achieved at 116 Gy, which is assessed in the specific situation. The study of wavelength recovery after 3.375 kGy irradiation shows that the BWS can be recovered by around 7 pm from the 15 pm redshift, which indicates that the damage caused by the 3.5-h irradiation can be partly self-healed. This study shows the application feasibility of FBG as an online and remote radiation dosimeter.

这项工作旨在开发和表征用于布拉格光纤光栅剂量计温度补偿的数学算法，并研究累积辐射剂量对布拉格波长偏移（BWS）的影响。研究了由Co-60γ辐照引起的BWS及其对FBG的热光响应系数的影响。BWS对温度呈线性依赖性，FBG的固有热光系数范围为10.1至24.0 pm /°C。每2小时照射一次，立即测量FBG的热光系数。事实证明，热光系数不受累积辐射剂量的影响，辐射引起的波动小于2.2％。BWS由6引起。校正温度干扰后，在15小时内75 kGy伽玛射线显示线性增加。辐射诱发系数为5.18 pm / kGy，最低累积剂量检测极限可达到116 Gy，这是在特定情况下评估的。对3.375 kGy辐照后的波长恢复进行的研究表明，BWS可以在15 pm红移后的7 pm左右恢复，这表明3.5 h辐照引起的损伤可以部分自愈。这项研究显示了FBG作为在线和远程辐射剂量计的应用可行性。375 kGy辐照表明BWS可以从15 pm红移到7 pm左右恢复，这表明3.5 h辐照造成的损害可以部分自我修复。这项研究显示了FBG作为在线和远程辐射剂量计的应用可行性。375 kGy辐照表明BWS可以从15 pm红移到7 pm左右恢复，这表明3.5 h辐照造成的损害可以部分自我修复。这项研究显示了FBG作为在线和远程辐射剂量计的应用可行性。