1：Experimental Design and Method Selection:

The study involved the fabrication of a new radiation-hard germano-silicate glass optical fiber with a pure silica glass buffer and a boron-doped silica glass inner cladding. FBG was inscribed on the fiber to study its wavelength shift under various temperatures and γ-ray irradiation conditions.

2：Sample Selection and Data Sources:

The optical attenuation and Bragg reflection wavelength of FBG were measured under various temperature conditions without the γ-ray irradiation together with before, during, and after the γ-ray irradiation at temperature of 35 ℃.

3：List of Experimental Equipment and Materials:

The γ-ray irradiation was carried out onto the fibers by a 60Co γ-ray. Optical transmission was measured to investigate the dependence of γ-ray dose-rate of the buffered and reference fibers with the FBG on RIA by using the OSA together with the amplified spontaneous emission source operating around 1550 nm as an input light source.

4：Experimental Procedures and Operational Workflow:

The fibers with the FBGs inscribed in the middle of the total length of 11 meters were irradiated by the 60Co γ-ray until total dose of 22.85 kGy, which was the maximum irradiation dose per hour of our irradiation facility, at stabilized temperature of 35±0.1 ℃ in an electric temperature chamber having a γ-ray transmission silica glass window.

5：85 kGy, which was the maximum irradiation dose per hour of our irradiation facility, at stabilized temperature of 35±1 ℃ in an electric temperature chamber having a γ-ray transmission silica glass window. Data Analysis Methods:

5. Data Analysis Methods: The RIA and the RIBRW shift were calculated from the difference of optical output powers and Bragg reflection peak wavelengths, respectively before and after the irradiation within the length of the exposed fiber.