Title :
Radiation effect in silica optical fiber exposed to intense mixed neutron-gamma radiation field
Author :
Brichard, B. ; Borgermans, P. ; Fernandez, A. Fernandez ; Lammens, K. ; Decréton, M.
Author_Institution :
Belgian Nuclear Research Centre, SCK/CEN, Mol, Belgium
fDate :
12/1/2001 12:00:00 AM
Abstract :
We measured in situ the radiation-induced absorption of pure silica core fibers exposed to a fission nuclear reactor. We observed the growth of the 1.39-μm. OH vibration band in polymer coated fiber. Three mechanisms are responsible for this effect: recoil protons, hydrogen diffusion, and a probable compaction effect. Based on this experiment, a fiber-optic neutron monitor prototype is proposed
Keywords :
OH--centres; fibre optic sensors; gamma-ray effects; light absorption; neutron detection; neutron effects; silicon compounds; 1.39 micron; OH vibration band; SiO2:OH; compaction effect; fiber-optic neutron monitor prototype; fission nuclear reactor; hydrogen diffusion; intense mixed neutron-gamma radiation field; optical fiber sensor; polymer coated fiber; pure silica core fibers; radiation effect; radiation-induced absorption; recoil protons; silica optical fiber; Absorption; Compaction; Fission reactors; Hydrogen; Nuclear measurements; Optical fibers; Polymer films; Protons; Radiation effects; Silicon compounds;
Journal_Title :
Nuclear Science, IEEE Transactions on
