Thermoluminescence Response of Ytterbium-doped and Undoped of Silicon Optical Fiber Subjected to Photon Irradiation

Radiation effects of photon irradiation in Ytterbium-doped silica optical fibers are still much less explored despite their importance in space-based application as radiation dosimetry. This study investigates and compares the thermoluminescence glow curve, response, linearity and sensitivity of Ytterbium-doped SiO2 optical fibers with that of TLD-100. Samples are placed in solid phantom and irradiated to 6 MV photon beam with doses ranging from 0.5 Gy to 4.00 Gy. These beams were provided by Primus MLC 3339 Linear Accelerator (LINAC) available at Hospital Sultan Ismail, Johor Bahru. The glow curve were analysed to determine various properties of the TLD’s. The results clearly showed the superiority of TLD-100 in terms of response and sensitivity to produce luminescence, followed by Yb-doped and Un-doped optical fibers. TLD-100 shows high sensitivity of about 659.1619 nC mg-1 Gy-1, while the Yb-doped optical fiber sensitivity is 0.3834 nC mg-1 Gy-1 and the Un-doped optical fiber sensitivity is 0.2248 nC mg-1 Gy-1. On the other hand, the sensitivity for TLD-100 is 1719.25 times higher than Yb-doped fiber and is 2932.21 times higher than that of Un-doped optical fiber.