Infrared luminescence for real time ionizing radiation detection

Veronese, I.; Mattia, Cristina De; Fasoli, M.; Chiodini, N.; Monès, E.; Cantone, M.C.; Vedda, A.

doi:10.1063/1.4892880

Cited by 36 publications

(27 citation statements)

References 24 publications

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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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Section: Introductionmentioning

confidence: 99%

Ruby-based inorganic scintillation detectors for¹⁹²Ir brachytherapy

Kertzscher

Beddar

2016

Phys. Med. Biol.

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“…In particular, it is clear that the attractiveness of fiber optic dosimeters would be greatly enhanced by employing a scintillation signal free from any spectral superposition with the spurious ones. We demonstrated that it is possible using a scintillator with an emission in the near infrared, that can be clearly distinguished from the stem effect emission occurring in the UV-VIS spectral region 25,26) . This work aims to summarize the main findings of a recent comprehensive characterization of the dosimetric properties of Yb-doped silica optical fibers coupled with an optical detector prototype based on an avalanche photo-diode (APD) 27) .…”

Section: Doped Portionmentioning

confidence: 99%

Characterization of Yb-doped silica optical fiber as real-time dosimeter

Veronese

Chiodini

Cialdi

et al. 2017

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIX

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The near-infrared radioluminescence and dosimetric properties of Yb-doped silica optical fibers, coupled with an optical detector prototype based on an avalanche photo-diode, were studied by irradiating the fibers with clinical beams generated by a Varian Trilogy accelerator. The performances of the system in standard and small field sizes have been also investigated comparing the output factor, percent depth dose and off axis ratio measurements of the prototypal dosimetric system with other commercial sensors.The results demonstrated that the drawback due to the stem effect in Yb-doped silica optical fibers can be managed in a simple but effective way by optical filtering. These features, together with the accuracy and precision achieved by Ybdoped fibers in relative dose assessments make the device promising for in-vivo dosimetry studies in radiation therapy.

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“…Finally, the luminescence and dosimetric properties of Yb-doped silica optical fibres are currently being studied. The sharp RL emission line at 975 nm due to the 2 F 5/2 -2 F 7/2 transition of Yb 3+ makes this dopant very promising for a prompt and efficient subtraction of the stem effect contribution simply by optical filtering [39].…”

Section: Doped Silica Optical Fibre Based Dosimetersmentioning

confidence: 99%

“…Recently, our research has been addressing the use of dopants emitting in the red and IR region of the visible spectrum in order to implement alternative methods for removing the stem effect contribution on the basis of the analysis of the RL spectra or optical filtering [36][37][38][39]. For this purpose, Eu-and Yb-doped silica fibres were produced and a thermoelectric cooled back-thinned CCD array spectrometer (Prime X, B&W Tek Inc., USA) operating within a wavelength range 200-990 nm was used as optical detector.…”

Section: Doped Silica Optical Fibre Based Dosimetersmentioning

confidence: 99%

Rare Earth Doped Silica Optical Fibre Sensors for Dosimetry in Medical and Technical Applications

2014

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Radioluminescence optical fibre sensors are gaining importance since these devices are promising in several applications like high energy physics, particle tracking, real-time monitoring of radiation beams, and radioactive waste. Silica optical fibres play an important role thanks to their high radiation hardness. Moreover, rare earths may be incorporated to optimise the scintillation properties (emission spectrum, decay time) according to the particular application. This makes doped silica optical fibres a very versatile tool for the detection of ionizing radiation in many contexts. Among the fields of application of optical fibre sensors, radiation therapy represents a driving force for the research and development of new devices. In this review the recent progresses in the development of rare earth doped silica fibres for dosimetry in the medical field are described. After a general description of advantages and challenges for the use of optical fibre based dosimeter during radiation therapy treatment and diagnostic irradiations, the features of the incorporation of rare earths in the silica matrix in order to prepare radioluminescent optical fibre sensors are presented and discussed. In the last part of this paper, recent results obtained by using cerium, europium, and ytterbium doped silica optical fibres in radiation therapy applications are reviewed.

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Infrared luminescence for real time ionizing radiation detection

Cited by 36 publications

References 24 publications

Ruby-based inorganic scintillation detectors for¹⁹²Ir brachytherapy

Ruby-based inorganic scintillation detectors for¹⁹²Ir brachytherapy

Characterization of Yb-doped silica optical fiber as real-time dosimeter

Rare Earth Doped Silica Optical Fibre Sensors for Dosimetry in Medical and Technical Applications

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Infrared luminescence for real time ionizing radiation detection

Cited by 36 publications

References 24 publications

Ruby-based inorganic scintillation detectors for192Ir brachytherapy

Ruby-based inorganic scintillation detectors for192Ir brachytherapy

Characterization of Yb-doped silica optical fiber as real-time dosimeter

Rare Earth Doped Silica Optical Fibre Sensors for Dosimetry in Medical and Technical Applications

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Ruby-based inorganic scintillation detectors for¹⁹²Ir brachytherapy

Ruby-based inorganic scintillation detectors for¹⁹²Ir brachytherapy