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Comparison between fast neutron and gamma irradiation of optical fibres

 

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Aerospatiale Espace et Defence, Les Mureaux:
RADECS 1997, Fourth European Conference on Radiation and its Effects on Components and Systems : September 15 - 19, 1997, Cannes, France
Piscataway, NJ: IEEE, 1998
ISBN: 0-7803-4071-X
S.430-438
European Conference on Radiation and its Effects on Components and Systems (RADECS) <4, 1997, Cannes>
Englisch
Konferenzbeitrag
Fraunhofer INT ()
fast neutrons; gamma radiation; optical fibers; radiation effect; radiation induced loss; recoil protons; breaking stress

Abstract
A variety of undoped multimode step-index fibres and Gedoped single mode and graded index fibres is irradiated by 14 MeV neutrons an Co60 gamma rays up to the same total dose. Radiation-induced loss and breaking stress are measured. The loss induced during gamma irradiation of Ge-doped fibres is about 2.5 times higher than during neutron irradiation with the same dose rate, up to a fluence of about 3X10E12 1/cmE2 (14 MeV). This loss ratio decreases to <2.0 after about 10E13 1/cmE2 (14 MeV). Monte Carlo calculations of the dose enhancement as caused by fast recoil protons out of the H-containing acrylate coating are confirmed experimentally. 14 MeV neutron irradiation up to <10E13 1/cmE2 seems to decrease fibre breaking stress by 3 - 4 %, whereas Co60 gamma irradiation up to the same total dose has no effect.

: http://publica.fraunhofer.de/dokumente/N-269.html