Comparison between fast neutron and gamma irradiation of optical fibres

Author

Henschel, H. ; Köhn, O. ; Lennartz, W. ; Metzger, S. ; Schmidt, H.U. ; Rosenkranz, J. ; Glessner, B. ; Siebert, B.R.L.

Author_Institution

Fraunhofer-INT, Euskirchen, Germany

Volume

45

Issue

3

fYear

1998

fDate

6/1/1998 12:00:00 AM

Firstpage

1543

Lastpage

1551

Abstract

A variety of undoped multimode step-index fibres and Ge-doped single mode and graded index fibres is irradiated by 14 MeV neutrons and ⁶⁰Co 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 3×10¹² cm^-2 (14 MeV). This loss ratio decreases to ⩽2.0 after about 10¹³ cm^-2 (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 ⩽10¹³ cm ^-2 seems to decrease fibre breaking stress by 3-4%, whereas ⁶⁰Co gamma irradiation up to the same total dose has no effect

Keywords

Monte Carlo methods; gamma-ray effects; neutron effects; optical fibre losses; optical fibres; 1.4 MeV; Ge-doped graded index fibre; Ge-doped single mode fibre; Monte Carlo simulation; acrylate coating; breaking stress; gamma irradiation; neutron irradiation; optical fibre; radiation-induced loss; recoil protons; undoped multimode step-index fibre; Coatings; Gamma rays; Loss measurement; Monte Carlo methods; Neutrons; Optical fiber sensors; Optical fiber testing; Optical fibers; Protons; Stress;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/23.685237

Filename

685237