Universiti Teknologi Malaysia Institutional Repository

The assessment of tailor-made optical fibre subjected to ionizing radiation

Che Omar, Siti Shuwaibah (2015) The assessment of tailor-made optical fibre subjected to ionizing radiation. Masters thesis, Universiti Teknologi Malaysia, Faculty of science.

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Abstract

The dosimetric properties of thermoluminescence (TL) dosimeter such as dose response, linearity, sensitivity, fading, minimum detectable dose (MDD), glow curve and reproducibility of optical fibres in comparison with TLD-100 (rod types) have been investigated. The samples used were Dummy Flat Fibre (DFF), Flat Fibre (FF), Photonic Crystal Fibre (PCF), Multi Photonic Crystal Fibre (MPCF) of 2 mm and 220 µm diameter, Photosensitive Flat Fibre (PFF), Single Mode Optical Fibre (SMF), Germanium - doped (Ge), Erbium - doped (Er) and Aluminum doped Thulium (Al: Tm). The TL samples were placed in solid phantom and irradiated with 6, 9 and 12 MeV electrons beam with dose ranging from 1.0 Gy to 4.0 Gy by using linear accelerator (LINAC) machine. Investigations were also conducted for X - rays with mean energies of 30, 60 and 70 kV, and gamma rays (60Co) from 1.0 mGy up to 24.0 Gy. The glow curves were observed between 155 °C to 287 °C. The results of TL dosimeter subjected to 6, 9 and 12 MeV electrons clearly showed that PFF was superior in terms of TL response and sensitivity. This was followed by Ge, DFF, TLD-100, FF, PCF, Er, Al: Tm, MPCF 2 mm and MPCF 220 µm. For X-ray irradiation, the SMF showed 10 and 8 times more sensitive than TLD-100. The MDD obtained from optical fibres subjected to electron irradiation were between 0.53- 0.60 mGy for PFF, 0.78-0.81 mGy for TLD-100, 1.00-1.26 mGy for Ge and 1.44-1.64 mGy for DFF. The results showed that PFF and SMF have great potential to be considered as a radiation dosimeter.

Item Type:Thesis (Masters)
Additional Information:Thesis (Sarjana Kejuruteraan (Fizik)) - Universiti Teknologi Malaysia, 2015; Supervisors : Dr. Suhairul Hashim, Assoc. Prof. Dr. Wan Muhamad Saridan Wan Hassan
Uncontrolled Keywords:thermoluminescence (TL), minimum detectable dose (MDD)
Subjects:Q Science > QC Physics
Divisions:Science
ID Code:54657
Deposited By: Muhamad Idham Sulong
Deposited On:13 Apr 2016 16:16
Last Modified:07 Jun 2017 11:08

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