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Proceedings Paper

Feasibility study for distributed dose monitoring in ionizing radiation environments with standard and custom-made optical fibers
Author(s): Marco Van Uffelen; Francis Berghmans; Benoit Brichard; Paul Borgermans; Marc C. Decreton
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Paper Abstract

Optical fibers stimulate much interest since many years for their potential use in various nuclear environments, both for radiation tolerant and EMI-free data communication as well as for distributed sensing. Besides monitoring temperature and stress, measuring ionizing doses with optical fibers is particularly essential in applications such as long-term nuclear waste disposal monitoring, and for real-time aging monitoring of power and signal cables installed inside a reactor containment building. Two distinct options exist to perform optical fiber dosimetry. First, find an accurate model for a restricted application field that accounts for all the parameters that influence the radiation response of a standard fiber, or second, develop a dedicated fiber with a response that will solely depend on the deposited energy. Using various models presented in literature, we evaluate both standard commercially available and custom-made optical fibers under gamma radiation, particularly for distributed dosimetry applications with an optical time domain reflectometer (OTDR). We therefore present the radiation induced attenuation at near-infrared telecom wavelengths up to MGy total dose levels, with dose rates ranging from about 1 Gy/h up to 1 kGy/h, whereas temperature was raised step-wise from 25 °C to 85 °C. Our results allow to determine and compare the practical limitations of distributed dose measurements with both fiber types in terms of temperature sensitivity, dose estimation accuracy and spatial resolution.

Paper Details

Date Published: 11 November 2002
PDF: 9 pages
Proc. SPIE 4823, Photonics for Space Environments VIII, (11 November 2002); doi: 10.1117/12.452261
Show Author Affiliations
Marco Van Uffelen, SCK-CEN-Belgian Nuclear Research Ctr. (Belgium)
Francis Berghmans, SCK-CEN-Belgian Nuclear Research Ctr. (Belgium)
Benoit Brichard, SCK-CEN-Belgian Nuclear Research Ctr. (Belgium)
Paul Borgermans, SCK-CEN-Belgian Nuclear Research Ctr. (Belgium)
Marc C. Decreton, SCK-CEN-Belgian Nuclear Research Ctr. (Belgium)

Published in SPIE Proceedings Vol. 4823:
Photonics for Space Environments VIII
Edward W. Taylor, Editor(s)

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