X-rays, γ-rays and Proton Beam Monitoring with Multimode Nitrogen-doped Optical Fiber

Abstract : We investigated the potential of a multimode (50 μ m core diameter) nitrogen doped silica-based optical fiber for X-rays, protons and γ-rays radiation detection and dosimetry. X-rays results confirm that this N-doped fiber presents a strong radioluminescence (RL) around 550 nm when exposed to radiation. The RL observed from a few cm long sample linearly depends on the dose rate at least in the 1 mGy/s to 50 Gy/s range. Low dose rate γ-ray tests demonstrate the radiation detection at dose rate as low as 40 μ Gy/s with a 2 m long fiber sample. This fiber is also associated with an optically-stimulated luminescence (OSL) when exposed to a 1064 nm laser light post-irradiation. This OSL signature provides shortly after the irradiation a precise estimation of the accumulated dose at least in the 1 Gy to 10 kGy range. Under proton exposure, we benchmarked the performances of the N-doped fiber with the ones of a conventional Markus chamber used by the TRIUMF proton-therapy team. This comparison highlights the potential of the small-size N-doped fiber to partially overcome the known limitations of commercial fiber-based dosimeters for medical applications. The obtained results are very promising for the future design of more complex spatially-resolved beam monitoring systems.
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https://hal-ujm.archives-ouvertes.fr/ujm-01964633
Contributor : Sylvain Girard <>
Submitted on : Saturday, December 22, 2018 - 10:03:47 PM
Last modification on : Thursday, July 25, 2019 - 4:34:16 PM

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S. Girard, D. Di Francesca, A. Morana, C. Hoehr, P. Paillet, et al.. X-rays, γ-rays and Proton Beam Monitoring with Multimode Nitrogen-doped Optical Fiber. IEEE Transactions on Nuclear Science, Institute of Electrical and Electronics Engineers, 2018, pp.1-1. ⟨10.1109/TNS.2018.2879791⟩. ⟨ujm-01964633⟩

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