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开展了掺锗石英光纤在1.0×10~(-4)~0.5Gy(Si)/s剂量率下的稳态γ辐照实验和10~6~10~9 Gy(Si)/s剂量率下的瞬态γ辐照实验。结果表明:光纤辐射感生损耗与辐照总剂量呈饱和指数关系,与色心浓度微分方程推导出的结论相一致。在辐照总剂量相同的情况下,光纤辐射感生损耗随辐照剂量率的增大而增大。辐照期间有光注入较无光注入时的光纤辐射感生损耗低,证实了光褪色效应的存在。对实验用650、850和1 310nm 3个波长,光纤辐射感生损耗随波长的增大而减小。与光纤稳态辐射感生损耗相比,光纤瞬态辐射感生损耗要大得多;光纤瞬态辐射感生损耗峰值与脉冲总剂量呈线性关系,这与饱和指数关系在低剂量下的泰勒展开近似一致。
The steady-state γ-irradiation experiments and the dose rates of 10 ~ 6 ~ 10 ~ 9 Gy (Si) / s at the dose rates of 1.0 × 10 -4 ~ 0.5 Gy (Si) / s were carried out with germanium- Transient gamma irradiation experiment. The results show that the relationship between the induced loss of optical fiber radiation and the total dose of irradiation is a saturated index, which is consistent with the conclusion derived from the differential equation of color center concentration. Under the same irradiation dose, the induced loss of fiber radiation increases with the increase of radiation dose rate. During the irradiation, there was less induced loss of the fiber radiation than that of the non-light injection, confirming the existence of the light fading effect. For experiments with 650, 850 and 1 310nm wavelengths, the induced loss of fiber radiation decreases with increasing wavelength. Compared with the steady-state radiation induced loss of optical fiber, the induced loss of optical fiber transient radiation is much larger; the peak of induced loss of optical fiber transient radiation has a linear relationship with the total pulse dose, which is related to the saturation index of Taylor in low dose Expand approximately the same.