Title :
Origin of the radiation-induced OH vibration band in polymer-coated optical fibers irradiated in a nuclear fission reactor
Author :
Brichard, B. ; Fernandez, A. Fernandez ; Berghmans, F. ; Decréton, M.
Author_Institution :
Belgian Nucl. Res. Centre, SCK/CEN, Mol, Belgium
fDate :
12/1/2002 12:00:00 AM
Abstract :
We measured in situ the radiation-induced absorption of pure silica core fibers exposed to a fission nuclear radiation. We observed the growth of the 1.38-μm OH vibration band in polymer coated fiber. Two contributions, a gamma-induced hydrogen diffusion and the recoil protons, are compared. The major contribution to the OH content growth is identified to originate from the gamma-induced hydrogen diffusion. The identification of the parameters governing the mechanism has important implications on the design of a fast-neutron fiber optic monitor.
Keywords :
defect absorption spectra; diffusion; fibre optic sensors; gamma-ray effects; infrared spectra; neutron detection; neutron effects; noncrystalline defects; optical fibre testing; 1.38 micron; OH; SiO2; fast-neutron fiber optic monitor; gamma-induced hydrogen diffusion; in situ measurement; nonbridging oxygen hole defect; nuclear fission reactor irradiation; polymer-coated optical fibers; pure silica core fibers; radiation-induced OH vibration band; radiation-induced absorption; recoil protons; Electromagnetic wave absorption; Fission reactors; Hydrogen; Inductors; Nuclear measurements; Optical fibers; Optical polymers; Polymer films; Protons; Silicon compounds;
Journal_Title :
Nuclear Science, IEEE Transactions on
DOI :
10.1109/TNS.2002.805986