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Description
Accurate radiation dosimetry in high-energy and high-radiation environments remains a critical challenge for applications in particle physics, nuclear engineering, and space systems. This study investigates the performance of germanium-doped fiber optic sensors as robust and sensitive platforms for radiation monitoring under extreme conditions. In this study, a germanium-doped FBG sensor was irradiated with high-energy protons at the CERN IRRAD facility to 1.85 MGy to investigate radiation-induced effects and assess its suitability for dosimetry. The sensor response was characterized by comparing temperature sensitivity before and after irradiation, enabling evaluation of radiation-induced changes in the thermo-optic and strain-optic coefficients. Additionally, the bragg wavelength shift, spectra width and power shift as a function of accumulated dose were conducted to quantify the impact of proton irradiation on the grating structure. The results show measurable modifications in sensor behavior post-irradiation, including changes in baseline wavelength and sensitivity. A calibration procedure was developed to correlate the radiation-induced spectral shift with absorbed dose, demonstrating the feasibility of using germanium-doped FBGs as passive dosimeters. The relationship between wavelength shift and dose was analyzed in terms of linearity, repeatability, and stability. This work demonstrates that germanium-doped FBG sensors can serve as compact, immune-to-electromagnetic-interference dosimeters, with potential applications in high-radiation environments such as particle accelerators, nuclear facilities, and space systems.
| Apply for student award at which level: | PhD |
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| Consent on use of personal information: Abstract Submission | Yes, I ACCEPT |