Development of an Anthracene-Coated SMF-MMF-SMF Sensor for Low-Dose UV Radiation Detection and Dosimetry

This study evaluates the efficacy of a single-mode, multimode, and single-mode (SMF-MMF-SMF) fiber configuration for low-dose optical radiation monitoring applications, such as UV detection and dosimetry. Particular attention is devoted to radiation-induced absorption (RIA) and radiation-induced refractive index change (RIRIC). Radiation exposure alters the refractive index of fiber materials, resulting in a shift in the peak wavelength. This study utilized a multimode fiber with a core diameter of 65 μm, and its sensing region was coated with anthracene solutions at varying concentrations of 1 wt%, 3 wt%, and 5 wt%. The experimental findings demonstrate that RIRIC and RIA depend on the energy of the applied radiation for all sensor configurations. A discernible shift in the peak wavelength was observed. When the impact of anthracene concentration on sensor efficiency was examined, the sensitivity of the 3 wt% solution was higher than that of the 1 wt% and 5 wt% solutions. This work contributed to the advancement of optical fiber sensor technology, specifically in the context of radiation detection. The results may encourage further exploration of hybrid fiber configurations and functional coatings, opening new avenues for the next-generation fiber optic dosimeters.