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

详细信息    查看全文

• 作者：S. Hashim ; D.A. Bradley ; M.I. Saripan ; A.T. Ramli ; H. Wagiran
• 关键词：Thermoluminescence ; SiO₂ optical fibres ; Fast neutrons ; Monte Carlo N-particle (MCNP)
• 刊名：Applied Radiation and Isotopes
• 出版年：2010
• 出版时间：April-May 2010
• 年：2010
• 卷：68
• 期：4-5
• 页码：700-703
• 全文大小：228 K

文摘

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 (MCNP^TM) 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.