Feasibility of radiation dosimetry with phosphorus-doped optical fibers in the ultraviolet and visible domain

Abstract : We investigated the feasibility of using phosphorus-doped optical fibers to monitor the levels of deposited dose during an irradiation. For this, we characterized their spectral and time dependence of the steady state 10 keV X-ray radiation-induced attenuation in the ultraviolet and visible range of wavelengths (200 nm- 900 nm). Their radiation sensitivity is very high with losses exceeding 10 dB m−1 for doses larger than 10 Gy and wavelengths shorter than 550 nm. Our results reveal a sub linear dose dependence of the induced losses that also depends on the dose rate (1 Gy s−1-50 Gy s−1) between 350 nm and 900 nm. For this spectral domain, excess of attenuation is due to the phosphorus oxygen-hole centers. P2 defects are responsible for the induced losses around 300 nm that linearly increase with the dose at least until 1 kGy and without dose rate effect. We measured no noticeable influence of the temperature (5 °C-50 °C) on the radiation-induced attenuation in the studied spectral domain. Our study shows that dosimetry with phosphorus-doped fibers seems possible in the ultraviolet (around 300 nm) with a sensitivity enhanced by a factor N100 compared to the one observed in the infrared region (>900 nm).
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https://hal-ujm.archives-ouvertes.fr/ujm-00587444
Contributor : Youcef Ouerdane <>
Submitted on : Wednesday, April 20, 2011 - 2:12:22 PM
Last modification on : Monday, October 15, 2018 - 4:04:10 PM

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Sébastien Girard, Y. Ouerdane, C. Marcandella, A. Boukenter, S. Quenard, et al.. Feasibility of radiation dosimetry with phosphorus-doped optical fibers in the ultraviolet and visible domain. Journal of Non-Crystalline Solids, Elsevier, 2011, 357, pp.1871-1874. ⟨10.1016/j.jnoncrysol.2010.11.113⟩. ⟨ujm-00587444⟩

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