Comparison of effective atomic number, output factor, and glow curve of fabricated Ge-doped optical fibers (FGDOFs) for electron beams dosimetry

Abstract

The present study is extended from a previous study on advanced characteristics for Fabricated Ge-Doped Optical Fibers (FGDOFs) in electron beam dosimetry with comparison in terms of Effective Atomic Number (Zeff), Output Factor (OF), and Glow Curve Analysis. Other than that, the different shapes and germanium dopant concentrations of FGDOFs were studied. Regarding Zeff, Flat Fiber (FF) showed lower Zeff than Cylindrical Fiber (CF) at a difference of ±7%. No significant difference at p > 0.05 for the of 6, -9, and 12 MeV electron energies. WinGCF software was used to deconvolute the glow curve, with the best fitting for FF and CF. Results from Glow Curve Analysis showed that the Maximum Temperature (Tmax) was energy independent for all CFs and FFs. Peak 3 (P3) was for the significantly deep holes for FF (2.3% mol; 643 μm × 356 μm), CF (2.3% mol; 481 μm), and CF (6.0% mol; 486 μm) while peak 4 (P4) for FF (6.0% mol; 620 μm × 165 μm) and CF (6.0% mol; 616 μm), respectively. Both FF (2.3% mol and 6.0% mol) have the greater sensitivity with the highest thermoluminescence (TL) signal due to the highest activation energy compared to CFs.