Radioluminescence of red-emitting Eu-doped phosphors for fiberoptic dosimetry

Molina, P.; Santiago, M.; Marcazzó, J.; Spano, Frank C.; Henniger, J.; Cravero, Walter Rubén; Caselli, E.

doi:10.1016/j.apradiso.2012.01.005

Cited by 12 publications

(15 citation statements)

References 25 publications

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“…These findings are similar to those of previous studies by Molina et al (2012) and Nakamura et al (2014). Molina and colleagues investigated ISDs made with Y 2 O 3 :Eu, YVO 4 :Eu, and Y 2 O2 S :Eu phosphors from the same manufacturer that produced the phosphors used in this study (Phosphor Technology Ltd.).…”

Section: Discussionsupporting

confidence: 89%

“…It was not possible to suppress the time dependence to values less than 1% by optically filtering out the wavelength regions outside the most intense emission lines because those emission lines exhibited strong time dependence. In contrast, Molina et al (2012) found no significant time dependence for Y 2 O 3 :Eu, YVO 4 :Eu, or Y 2 O 2 S:Eu phosphors that were exposed to 1.4 Gy from a 90 Sr source during a 3600 s time period, or for Y 2 O 3 :Eu exposed to about 0.35 Gy (about 60 s) from a 60 Co source. The scintillation signal of Y 2 O 3 :Eu, YVO 4 :Eu, and Y 2 O 2 S:Eu in our experiments changed by less than 0.5%, up to 0.6%, and 4%, respectively, with exposure to a 192 Ir source at 1.2 Gy, which corresponded to 10 s. The study by Molina et al and our results showed that the time-dependent luminescence properties of Y 2 O 3 :Eu and YVO 4 :Eu result in non-constant scintillation less than 1% during 1.4 Gy irradiation.…”

Section: Discussionmentioning

confidence: 66%

“…These Eu-activated scintillators have been studied for use with various external-beam radiation sources (Martinez et al 2015, Molina et al 2013, 2012, Souris et al 2014, McCarthy et al 2014), but their suitability for use with 192 Ir BT sources has yet to be established. Investigators have studied detectors using nanometer-sized Y 2 O 3 crystals co-doped with Eu and Li (Stanton et al 2014) for external-beam sources (Belley et al 2015b) and for 192 Ir HDR BT (Belley et al 2015a).…”

Section: Introductionmentioning

confidence: 99%

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Inorganic scintillation detectors based on Eu-activated phosphors for¹⁹²Ir brachytherapy

Kertzscher

Beddar

2017

Phys. Med. Biol.

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The availability of real-time treatment verification during high-dose-rate (HDR) brachytherapy is currently limited. Therefore, we studied the luminescence properties of the widely commercially available scintillators using the inorganic materials Eu-activated phosphors Y2O3:Eu, YVO4:Eu, Y2O2S:Eu, and Gd2O2S:Eu to determine whether they could be used to accurately and precisely verify HDR brachytherapy doses in real time. The suitability for HDR brachytherapy of inorganic scintillation detectors (ISDs) based on the 4 Eu-activated phosphors in powder form was determined based on experiments with a 192Ir HDR brachytherapy source. The scintillation intensities of the phosphors were 16 to 134 times greater than that of the commonly used organic plastic scintillator BCF-12. High signal intensities were achieved with an optimized packing density of the phosphor mixture and with a shortened fiber-optic cable. The influence of contaminating Cerenkov and fluorescence light induced in the fiber-optic cable (stem signal) was adequately suppressed by inserting between the fiber-optic cable and the photodetector a 25-nm band-pass filter centered at the emission peak. The spurious photoluminescence signal induced by the stem signal was suppressed by placing a long-pass filter between the scintillation detector volume and the fiber-optic cable. The time-dependent luminescence properties of the phosphors were quantified by measuring the non-constant scintillation during irradiation and the afterglow after the brachytherapy source had retracted. We demonstrated that a mixture of Y2O3:Eu and YVO4:Eu suppressed the time-dependence of the ISDs and that the time-dependence of Y2O2S:Eu and Gd2O2S:Eu introduced large measurement inaccuracies. We conclude that ISDs based on a mixture of Y2O3:Eu and YVO4:Eu are promising candidates for accurate and precise real-time verification technology for HDR BT that is cost effective and straightforward to manufacture. Widespread dissemination of this technology could lead to an improved understanding of error types and frequencies during BT and to improved patient safety during treatment.

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Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 66%

Section: Introductionmentioning

confidence: 99%

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Inorganic scintillation detectors based on Eu-activated phosphors for¹⁹²Ir brachytherapy

Kertzscher

Beddar

2017

Phys. Med. Biol.

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“…First, a wide variety of scintillator materials emit in the red wavelength region, i.e., 600–750 nm (Jordan 1996, Molina et al 2012, Veronese et al 2014, McCarthy et al 2013, Teichmann et al 2013, Martinez et al 2015). Scintillation in longer wavelengths is advantageous for dosimetry because it greatly simplifies the removal of the most important sources of measurement uncertainty for scintillation detectors—the Cerenkov and fluorescence effects (Beddar et al 1992a, Therriault-Proulx et al 2013a), which exhibit a continuous emission spectrum most prominent in the blue region.…”

Section: Introductionmentioning

confidence: 99%

Ruby-based inorganic scintillation detectors for¹⁹²Ir brachytherapy

Kertzscher

Beddar

2016

Phys. Med. Biol.

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We tested the potential of ruby inorganic scintillation detectors (ISDs) for use in brachytherapy and investigated various unwanted luminescence properties that may compromise their accuracy. The ISDs were composed of a ruby crystal coupled to a poly(methyl methacrylate) fiber-optic cable and a charge-coupled device camera. The ISD also included a long-pass filter that was sandwiched between the ruby crystal and the fiber-optic cable. The long-pass filter prevented the Cerenkov and fluorescence background light (stem signal) induced in the fiber-optic cable from striking the ruby crystal, which generates unwanted photoluminescence rather than the desired radioluminescence. The relative contributions of the radioluminescence signal and the stem signal were quantified by exposing the ruby detectors to a high-dose-rate brachytherapy source. The photoluminescence signal was quantified by irradiating the fiber-optic cable with the detector volume shielded. Other experiments addressed time-dependent luminescence properties and compared the ISDs to commonly used organic scintillator detectors (BCF-12, BCF-60). When the brachytherapy source dwelled 0.5 cm away from the fiber-optic cable, the unwanted photoluminescence was reduced from > 5% to < 1% of the total signal as long as the ISD incorporated the long-pass filter. The stem signal was suppressed with a band-pass filter and was < 3% as long as the source distance from the scintillator was < 7 cm. Some ruby crystals exhibited time-dependent luminescence properties that altered the ruby signal by > 5% within 10 s from the onset of irradiation and after the source had retracted. The ruby-based ISDs generated signals of up to 20 times that of BCF-12-based detectors. The study presents solutions to unwanted luminescence properties of ruby-based ISDs for high-dose-rate brachytherapy. An optic filter should be sandwiched between the ruby crystal and the fiber-optic cable to suppress the photoluminescence. Furthermore, we recommend avoiding ruby crystals that exhibit significant time-dependent luminescence.

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“…Nat. 41(159):168-173, abril-junio de 2017 doi: http://dx.doi.org/10.18257/raccefyn.457 A large number of materials with features luminescent have been studied recently Santiago, et al, 2011;Molina, et al, 2012;Guarneros, et al, 2013;Marcazzo, et al, 2015, with new techniques. Most of these materials tend to exhibit a sub-or over-response compared with the absorbed dose deposited in tissue, because these materials are not tissueequivalent (Te) (Zeff ≈ 7.4).…”

Section: Introductionmentioning

confidence: 99%

Properties of the HPHT diamond when used as a soft X-Ray detector

Meléndrez

Lagos

Ovalle

2017

Rev. Acad. Colomb. Cienc. Ex. Fis. Nat.

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The diamond has extraordinary physical and chemical properties. This material by having a Zeff (atomic numbercash) equivalent to the human tissue is converted into a material suitable for use as a dosimeter of radiation. In this work, the properties of response to Afterglow (AG), Thermoluminescence (TL) and Optically Stimulated Luminescence (OSL) in HPHT diamond type lb (high temperature and high pressure diamond) are studied when subjected to lightning X (0.75 mA, 35 kV). The properties dosimetric curve and the TL were obtained on a computer Riso TL/OSL, where studies of fading (fading thermoluminescent), show that after a time of 1 hour, it stabilizes the signal TL and the reproducibility presents an error signal is not greater 5%. It is linearity in the three techniques for absorbed dose between 0-2 Gy. Between 2-9 Gy can be considered a response supralineal for the three techniques used and obtained a saturation of the sample to the absorbed doses increased to 9 Gy. It is showed that this material presents a promising future as a dosimeter in clinical radiation beams soft, used especially for radiation dosimetry for clinical use. © 2017. Acad. Colomb. Cienc. Ex. Fis. Nat.Key words: Properties dosimetric; Characteristics of the TL and OSL; Diamond; High pressure; High temperature. Propiedades del diamante HPHT cuando es usado como detector de rayos x de baja intensidad ResumenEl diamante posee extraordinarias propiedades físicas y químicas, y se ha propuesto para ser utilizado como dosímetro de radiación por tener un Zeff equivalente al tejido humano. En este trabajo, se estudian las propiedades de respuesta al Afterglow (AG), la termoluminiscencia (TL) y la luminiscencia ópticamente estimulada (OSL) en materiales diamante HPHT tipo lb, cuando son sometidos a Rayos X suaves (0,75 mA, 35 kV). Las propiedades dosimétricas y la curva TL fueron obtenidas en un equipo Riso TL/OSL, donde los estudios de fading, muestran que luego de 1 hora se estabiliza la señal de TL, la reproducibilidad presenta un error en señal no mayor 5%. Se encuentra linealidad en las tres técnicas para dosis absorbida entre 0-2 Gy, entre 2-9 Gy puede considerarse una respuesta supralineal para las tres técnicas obteniendo una saturación de la muestra a dosis absorbidas mayores de 9 Gy. Se demuestra que este material presenta un futuro prometedor como dosímetro clínico para haces de radiación suaves, usados particularmente para dosimetría de radiaciones de uso clínico.

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Radioluminescence of red-emitting Eu-doped phosphors for fiberoptic dosimetry

Cited by 12 publications

References 25 publications

Inorganic scintillation detectors based on Eu-activated phosphors for¹⁹²Ir brachytherapy

Inorganic scintillation detectors based on Eu-activated phosphors for¹⁹²Ir brachytherapy

Ruby-based inorganic scintillation detectors for¹⁹²Ir brachytherapy

Properties of the HPHT diamond when used as a soft X-Ray detector

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Radioluminescence of red-emitting Eu-doped phosphors for fiberoptic dosimetry

Cited by 12 publications

References 25 publications

Inorganic scintillation detectors based on Eu-activated phosphors for192Ir brachytherapy

Inorganic scintillation detectors based on Eu-activated phosphors for192Ir brachytherapy

Ruby-based inorganic scintillation detectors for192Ir brachytherapy

Properties of the HPHT diamond when used as a soft X-Ray detector

Contact Info

Product

Resources

About

Inorganic scintillation detectors based on Eu-activated phosphors for¹⁹²Ir brachytherapy

Inorganic scintillation detectors based on Eu-activated phosphors for¹⁹²Ir brachytherapy

Ruby-based inorganic scintillation detectors for¹⁹²Ir brachytherapy