X-Ray Radioluminescence in Diversely Doped Multimode Silica-Based Optical Fibers

Meyer, Arnaud; Morana, Adriana; Hamzaoui, Hicham El; Capoen, Bruno; Bouwmans, Géraud; Bouazaoui, Mohamed; Girard, Sylvain; Marin, Emmanuel; Ouerdane, Y.; Boukenter, Aziz

doi:10.1109/tns.2022.3140392

Cited by 4 publications

(3 citation statements)

References 30 publications

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“…The Nanosecond scale pulsed X-ray sample-For the ns scale pulse experiment, the sample was prepared differently. Due to the ultra-high dose rate range produced by the ASTERIX facility, to obtain the correct measurements and distinguish the RIE produced by the N-doped sample rather than by the longer radiation-hardened transport fiber (that presents a low but non-null RIE signal [33]), the sample was prepared in two steps. The optical fiber transport line, identical in the µs-scale-pulsed and ns-scale-pulsed X-ray samples, consisted of the transport fiber shielded against ambient light, which linked the instrumentation to the optical fiber under radiation.…”

Section: Sample Descriptionmentioning

confidence: 99%

Monitoring of Ultra-High Dose Rate Pulsed X-ray Facilities with Radioluminescent Nitrogen-Doped Optical Fiber

Vidalot

Campanella

Dachicourt

et al. 2022

Sensors

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We exploited the potential of radiation-induced emissions (RIEs) in the visible domain of a nitrogen-doped, silica-based, multimode optical fiber to monitor the very high dose rates associated with experiments at different pulsed X-ray facilities. We also tested this sensor at lower dose rates associated with steady-state X-ray irradiation machines (up to 100 keV photon energy, mean energy of 40 keV). For transient exposures, dedicated experimental campaigns were performed at ELSA (Electron et Laser, Source X et Applications) and ASTERIX facilities from CEA (Commissariat à l’Energie Atomique—France) to characterize the RIE of this fiber when exposed to X-ray pulses with durations of a few µs or ns. These facilities provide very large dose rates: in the order of MGy(SiO2)/s for the ELSA facility (up to 19 MeV photon energy) and GGy(SiO2)/s for the ASTERIX facility (up to 1 MeV). In both cases, the RIE intensities, mostly explained by the fiber radioluminescence (RIL) around 550 nm, with a contribution from Cerenkov at higher fluxes, linearly depend on the dose rates normalized to the pulse duration delivered by the facilities. By comparing these high dose rate results and those acquired under low-dose rate steady-state X-rays (only RIL was present), we showed that the RIE of this multimode optical fiber linearly depends on the dose rate over an ultra-wide dose rate range from 10−2 Gy(SiO2)/s to a few 109 Gy(SiO2)/s and photons with energy in the range from 40 keV to 19 MeV. These results demonstrate the high potential of this class of radiation monitors for beam monitoring at very high dose rates in a very large variety of facilities as future FLASH therapy facilities.

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Section: Sample Descriptionmentioning

confidence: 99%

Monitoring of Ultra-High Dose Rate Pulsed X-ray Facilities with Radioluminescent Nitrogen-Doped Optical Fiber

Vidalot

Campanella

Dachicourt

et al. 2022

Sensors

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“…The emitted photons can be collected with detectors such as photomultiplier tubes (PMTs) or silicon photomultiplier (SiPM) and, for the best materials, the acquired RIL signal intensity linearly depends on the dose rate. [ 6 ] In this context, two particular factors have been identified as potential limits of the RIL‐based dosimeters: the stem effect, [ 7 ] that is, a background signal due to the irradiation of the light guide that could emit fluorescence, phosphorescence, and Cherenkov light, and the memory effect that leads to an increase in radioluminescence efficiency after extended exposure to ionizing radiation, a characteristic observed in many scintillating materials. [ 8 ] The first one is mainly related to Cherenkov emission in our materials, [ 9 ] so we will not focus on this aspect since the presented measurements are conducted under low‐energy photons (<100 keV, mean energy fluence of 40 keV), not able to induce Cherenkov effect.…”

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Preirradiation Treatment Influence on the Radioluminescence of a Nitrogen‐Doped Optical Fiber Dosimeter

Fricano,

Morana,

Vidalot

et al. 2024

Physica Status Solidi (a)

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The dosimetry performances of a nitrogen‐doped core (diameter of 8 μm) optical fiber, before and after 100 kV X‐Ray preirradiation treatments, up to cumulated dose of 1 MGy(SiO2), to highlight their effects on the radiation‐induced luminescence (RIL), are investigated. The RIL reproducibility versus dose rate calibration curves (in the 0.17–50 Gy s−1 range) are evaluated using four sets of ten different probes: three sets using preirradiated samples at 80 kGy, 280 kGy, 1 MGy, respectively, and one set with pristine samples. The RIL kinetics during ≈60 h long preirradiations at constant dose rate are also studied, showing a non‐negligible bright burn effect. The main outcome is that the preirradiation improves the fiber dosimetry properties since it: 1) enhances fiber radiation detection sensitivity, 2) improves the linearity of the RIL dose rate dependence, and 3) suppresses the observed afterglow postirradiation effect. However, after preirradiation, larger dispersion between the different probes is noted, from 4% (non‐irradiated samples) to 10% for the 1 MGy preirradiated samples. The possible physical explanations are discussed on the basis of the preirradiation filling deep traps that, competing with the RIL centers for the trapping of electrons released by ionization, influence the RIL efficiency.

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Proton Dosimetry Using Radiation-Induced Luminescence in Micrometer-Core Germanosilicate Optical Fibers

Bélanger-Champagne

Fricano

Morana

et al. 2023

IEEE Trans. Nucl. Sci.

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X-Ray Radioluminescence in Diversely Doped Multimode Silica-Based Optical Fibers

Cited by 4 publications

References 30 publications

Monitoring of Ultra-High Dose Rate Pulsed X-ray Facilities with Radioluminescent Nitrogen-Doped Optical Fiber

Monitoring of Ultra-High Dose Rate Pulsed X-ray Facilities with Radioluminescent Nitrogen-Doped Optical Fiber

Preirradiation Treatment Influence on the Radioluminescence of a Nitrogen‐Doped Optical Fiber Dosimeter

Proton Dosimetry Using Radiation-Induced Luminescence in Micrometer-Core Germanosilicate Optical Fibers

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