Feasibility study for distributed dose monitoring in ionizing radiation environments with standard and custom-made optical fibers

Marco Van Uffelen; Francis Berghmans; Benoit Brichard; Paul Borgermans; Marc C. Decreton

doi:10.1117/12.452261

11 November 2002 Feasibility study for distributed dose monitoring in ionizing radiation environments with standard and custom-made optical fibers

Marco Van Uffelen, Francis Berghmans, Benoit Brichard, Paul Borgermans, Marc C. Decreton

Author Affiliations +

Proceedings Volume 4823, Photonics for Space Environments VIII; (2002) https://doi.org/10.1117/12.452261
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

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.

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Marco Van Uffelen, Francis Berghmans, Benoit Brichard, Paul Borgermans, and Marc C. Decreton "Feasibility study for distributed dose monitoring in ionizing radiation environments with standard and custom-made optical fibers", Proc. SPIE 4823, Photonics for Space Environments VIII, (11 November 2002); https://doi.org/10.1117/12.452261

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