Samarium-doped oxyfluoride borophosphate glasses for x-ray dosimetry in Microbeam Radiation Therapy

Martin, Vincent; Okada, Go; Tonchev, D.; Belev, George; Wysokiński, Tomasz; Chapman, Dean; Kasap, S. O.

doi:10.1016/j.jnoncrysol.2012.12.015

Cited by 13 publications

(5 citation statements)

References 23 publications

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“…. In our earlier work, we have also observed X‐ray‐induced absorbance in Sm‐doped FP and FA glasses . Despite the coloration in the excitation and, perhaps, emission wavelength range, the samples are still suitable as MRT dosimetric plates as we only measure the PL signal at the surface of the sample by using a confocal microscope; thus, the coloration effect is practically negligible.…”

Section: Resultsmentioning

confidence: 99%

“…The MRT utilizes an intense and microstructured X‐ray beam (known as a microbeam), which requires the dosimetry technique to have submicrometer of X‐ray image resolving power and a wide range of dose detection capability (a large dynamic response) at least from 5 to 1000 Gy . In the past few years, we have proposed and demonstrated an approach based on monitoring the samarium (Sm)‐valence reduction . Our dosimetry technique mainly consists of two parts: (1) confocal fluorescence microscopy for high‐resolution image readout; and (2) Sm 3+ ‐doped material as a dosimetric detector, which undergoes Sm 3+ →Sm 2+ reduction as a result of X‐ray irradiation.…”

Section: Introductionmentioning

confidence: 99%

“…Potential dosimeter materials are clearly those that allow the Sm 3+ →Sm 2+ reduction to occur under irradiation; examples of irradiation include X‐rays, gamma‐rays, and intense infrared femtosecond laser . Among those materials, we have tested several Sm‐doped crystals, glass‐ceramics, and glasses including Sm‐doped fluorophosphate (FP) and fluoroaluminate (FA) glasses . Among the glasses, the Sm‐doped FP and FA glasses have been found to be successful dosimetric materials for this particular application.…”

Section: Introductionmentioning

confidence: 99%

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Samarium‐Doped Oxyfluoride Glass‐Ceramic as a New Fast Erasable Dosimetric Detector Material for Microbeam Radiation Cancer Therapy Applications at the Canadian Synchrotron

et al. 2014

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There is a special need to develop a dosimetry technique with a large-dynamic range and high-spatial resolution to characterize the microstructured X-ray beams used in microbeam radiation therapy (MRT) for cancer. We report the synthesis and characterization of oxyfluoride glass-ceramic (SiO 2 -Al 2 O 3 -CaF 2 -CaO-SmF 3 ) plates, which contain trivalent-samarium-doped calcium fluoride (CaF 2 :Sm 3+ ) nanocrystals, for use as a dosimetric detector material, particularly for MRT applications. Our approach utilizes the extent of Sm 3+ ?Sm 2+ valence reduction caused by X-ray irradiation as a probe of the X-ray dose delivered; and confocal fluorescent microscopy is used to read out the distribution of valence reduction through the photoluminescence (PL) signal. Our study showed that the Sm 3+ ?Sm 2+ valence reduction takes place in CaF 2 nanocrystals, but not in the glass matrix. The Sm 2+ shows PL emission predominantly due to the fast 4f 5 5d 1 ? 7 F 0 transition, which allows us to read out the detector plate at a high scanning speed. Further, our experiments showed that the detection dose range reaches several thousands of grays, and X-ray dose distribution is detected at a micrometer scale. In addition, the Sm 2+ signal can be erased either by heating the irradiated sample at a suitable high temperature or by exposing it to UV light; and the erased glass-ceramic plate is reusable. The new Sm-doped oxyfluoride glass-ceramic with CaF 2 nanocrystals reported in this work shows potential for practical use in highdose and high-resolution dosimetry for MRT. J. McKittrick-contributing editorManuscript No. 34020.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Samarium‐Doped Oxyfluoride Glass‐Ceramic as a New Fast Erasable Dosimetric Detector Material for Microbeam Radiation Cancer Therapy Applications at the Canadian Synchrotron

et al. 2014

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“…Recently, some researchers have reported RPL phenomenon in some inorganic materials using lanthanoid as a dopant such as Sm-doped oxyfluoride borophosphate glasses, 24) Sm-doped Li 2 CaSiO 4 , 25) Eu-doped SrAl 2 O 4 , 26) Eu-doped Ca 2 SiO 4 , 27) Eu-doped BaAlBO 3 F 2 glass-ceramics, 28) and Yb-doped NaCl. 29) These materials exhibit RPL attributed to a valence change of the doped lanthanoid ion by charge trapping, for instance Eu 3+ + e − → Eu 2+ .…”

Section: Introductionmentioning

confidence: 99%

Radiophotoluminescence properties of Eu-doped Li₂SrSiO₄ for radiation detectors

Takebayashi,

Okada,

Nanto

2023

Jpn. J. Appl. Phys.

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To search for new radiophotoluminescence (RPL) materials, Eu-doped Li2SrSiO4 was synthesized by the solid-state reaction and then studied its RPL properties for radiation detector applications. All the samples were identified to be Li2SrSiO4 by X-ray diffraction. The as-prepared sample shows photoluminescence (PL) due to Eu3+ while an additional PL band appears due to a formation of Eu2+ after X-ray irradiation. This indicates that the Eu-doped Li2SrSiO4 has RPL properties. The sensitivity of RPL (or PL intensity of Eu2+) to X-ray dose is the highest when the Eu concentration is 0.1%, and the dynamic range is 5-10000 mGy. In addition, the generated Eu2+ is so stable that only 2% of the signal degrades over 20 minutes after irradiation. The RPL signal notably decreases to about 30% of the initial value by heating at 500°C for 100 seconds, and it is reproducible multiple times even after the heat treatment.

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“…Common RPL materials are an Al 2 O 3 :Mg,C single crystal [6,7] and Ag-doped phosphate glasses [8,9], which are commercial products of Landauer group and Chiyoda Technol Corp., respectively. Recently, Sm-doped glasses and glass-ceramics have been demonstrated for use as an RPL phosphor in high-resolution and large-dose dosimetry applications [3,[10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Optically- and thermally-stimulated luminescences of Ce-doped SiO2 glasses prepared by spark plasma sintering

2016

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Rare-earth doped phosphors have been used in many applications including radiation measurements. In the latter applications, the radiation photons are converted to light so that we can indirectly detect the radiation using a conventional photodetector. In this work, we have prepared and characterized a Ce-doped SiO 2 glass for dosimeter applications. Unlike conventional techniques such as sol-gel synthesis, the sample was prepared by spark plasma sintering. Although the PL emission seems to be only from the Ce 3+ ions in the structure, due to the X-ray induced luminescence, we have also observed optically-stimulated luminescence (OSL), and thermally-stimulated luminescence (TSL), owing to a pair of silylenes and a set of dioxasilirane and silylene in addition to Ce 3+. We have measured the detector response vs irradiation dose for both the OSL and TSL. The detector response in both cases is linear over the dose range from at least 1 mGy to 2 Gy. Particularly, the sensitivity of TSL is so high that it should be considered to be a good candidate for practical applications.

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Samarium-doped oxyfluoride borophosphate glasses for x-ray dosimetry in Microbeam Radiation Therapy

Cited by 13 publications

References 23 publications

Samarium‐Doped Oxyfluoride Glass‐Ceramic as a New Fast Erasable Dosimetric Detector Material for Microbeam Radiation Cancer Therapy Applications at the Canadian Synchrotron

Samarium‐Doped Oxyfluoride Glass‐Ceramic as a New Fast Erasable Dosimetric Detector Material for Microbeam Radiation Cancer Therapy Applications at the Canadian Synchrotron

Radiophotoluminescence properties of Eu-doped Li₂SrSiO₄ for radiation detectors

Optically- and thermally-stimulated luminescences of Ce-doped SiO2 glasses prepared by spark plasma sintering

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Samarium-doped oxyfluoride borophosphate glasses for x-ray dosimetry in Microbeam Radiation Therapy

Cited by 13 publications

References 23 publications

Samarium‐Doped Oxyfluoride Glass‐Ceramic as a New Fast Erasable Dosimetric Detector Material for Microbeam Radiation Cancer Therapy Applications at the Canadian Synchrotron

Samarium‐Doped Oxyfluoride Glass‐Ceramic as a New Fast Erasable Dosimetric Detector Material for Microbeam Radiation Cancer Therapy Applications at the Canadian Synchrotron

Radiophotoluminescence properties of Eu-doped Li2SrSiO4 for radiation detectors

Optically- and thermally-stimulated luminescences of Ce-doped SiO2 glasses prepared by spark plasma sintering

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Radiophotoluminescence properties of Eu-doped Li₂SrSiO₄ for radiation detectors