The thermoluminescence response of doped SiO2 optical fibres subjected to fast neutrons

• Main Authors: Hashima, Suhairul, Bradley, D. A., Saripan, M. Iqbal, Ramli, Ahmad Termizi, Wagiran, Husin
• Format: Article
• Language: English; English
• Published: Elsevier 2010
• Online Access: http://psasir.upm.edu.my/id/eprint/11349/1/The%20thermoluminescence%20response%20of%20doped%20SiO2%20optical%20fibres%20subjected%20to%20fast%20neutrons.pdf; http://psasir.upm.edu.my/id/eprint/11349/

This paper describes a preliminary study of the thermoluminescence (TL) response of doped SiO2 optical fibres subjected to 241AmBe neutron irradiation. The TL materials, which comprise Al- and Ge-doped silica fibres, were exposed in close contact with the 241AmBe source to obtain fast neutron interactions through use of measurements obtained with and without a Cd filter (the filter being made to entirely enclose the fibres). The neutron irradiations were performed for exposure times of 1-, 2-, 3-, 5- and 7-days in a neutron tank filled with water. In this study, use was also made of the Monte Carlo N-particle (MCNPTM) code version 5 (V5) to simulate the neutron irradiations experiment. It was found that the commercially available Ge-doped and Al-doped optical fibres show a linear dose response subjected to fast neutrons from 241AmBe source up to seven days of irradiations. The simulation performed using MCNP5 also exhibits a similar pattern, albeit differing in sensitivity. The TL response of Ge-doped fibre is markedly greater than that of the Al-doped fibre, the total absorption cross section for Ge in both the fast and thermal neutrons region being some ten times greater than that of Al.