Phosphors for conventional and computed radiography

Gurvich, A. M.; Myakhkova, M.G.; Kavtorova, V. P.

doi:10.1016/1359-0189(93)90040-g

Cited by 8 publications

(5 citation statements)

References 14 publications

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“…The study of time-resolved RL induced by high-energy (4 MeV) accelerated electrons provides information PACS: 78.60.-b, Kn, Ya Radioluminescent, thermoluminescent and dosimetric properties of X-ray phosphors M. Ignatovych (1) , A. Kelemen (2) , N. Otvas (2) , A. Peto (2) and V. Ogenko (1) Abstract. Time-resolved radioluminescence (RL) of X-ray phosphors: BaFCl:Eu, ZnS.CdS:Ag and Y 2 Î 3 :Åu, which exhibited ultraviolet (λ max = 390 nm), yellow-green, (λ max = 530 nm) and red (λ max =620 nm) luminescence respectively, have been measured.…”

Section: Resultsmentioning

confidence: 99%

“…The study is devoted to visualization and detection of high-level, high-energy and high dose rate ionizing radiation created by isotopes of Chernobyl accident, that are still present inside Chernobyl Shelter. Our approach in solving the problem of visualization was to apply the X-ray phosphors widely used for intensifying luminescent screens or in computed tomography [1,2] and to test their emitting properties under high-energy and high-dose conditions.…”

Section: Introductionmentioning

confidence: 99%

“…

ExperimentalMaterials: Samples of Eu-containing phosphors such as BaFCl:Eu, Sr 3 (PO 4 ) 2 :Eu, Y 2 Î 3 :Eu and ZnS.CdS:Ag have been studied. Europium and argentum doped polycrystalline powders were obtained by the conventional solid state reaction; concentration of Eu and Ag was near 0.5 mol% in all samples.For the investigation the following techniques were used:1.

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confidence: 99%

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Radioluminescent, thermoluminescent and dosimetric properties of X-ray phosphors

Ignatovych¹

2000

Semicond. Phys. Quantum Electron. Optoelectron.

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IntroductionThe study is devoted to visualization and detection of high-level, high-energy and high dose rate ionizing radiation created by isotopes of Chernobyl accident, that are still present inside Chernobyl Shelter. Our approach in solving the problem of visualization was to apply the X-ray phosphors widely used for intensifying luminescent screens or in computed tomography [1,2] and to test their emitting properties under high-energy and high-dose conditions.Here we report on spectral (RL, TL) and dosimetric properties of X-ray phosphors, which displayed high efficiency in converting the ionizing radiation into visible luminescence [3,4]. ExperimentalMaterials: Samples of Eu-containing phosphors such as BaFCl:Eu, Sr 3 (PO 4 ) 2 :Eu, Y 2 Î 3 :Eu and ZnS.CdS:Ag have been studied. Europium and argentum doped polycrystalline powders were obtained by the conventional solid state reaction; concentration of Eu and Ag was near 0.5 mol% in all samples.For the investigation the following techniques were used:1. Time-resolved radioluminescence (RL). Excitation was induced by high-energy (4Mev) electron pulses of linear electron accelerator (LINAC) with ~ 2.6 ms duration and ~ 100 Gy dose, time resolution 1ms. An optical system consisting of lenses, fiber optic bundels, grating monochromator and a photomultiplier tube was applied as light detecting system; a digital storage scope stored the signal as the function of time (Fig.1).2. Thermoluminescence (TL). 3-D TL spectra measurements were carried out using spectrometer, described in [5]. TL glow curves dose -dependence measurments were performed as in [6]. ResultsRadioluminescence and dosimetric properties in high dose rate region.The study of time-resolved RL induced by high-energy (4 MeV) accelerated electrons provides information Kn, Ya Abstract. Time-resolved radioluminescence (RL) of X-ray phosphors: BaFCl:Eu, ZnS.CdS:Ag and Y 2 Î 3 :Åu, which exhibited ultraviolet (λ max = 390 nm), yellow-green, (λ max = 530 nm) and red (λ max =620 nm) luminescence respectively, have been measured. For tested phosphors a good proportionality between the light output of the radioluminescence and the dose rate in the region of dose rates from 3 to 45 MGy/s has been obtained. It was also revealed that the emitting properties of all phosphors are preserved after high-dose (10 4 Gy) and high temperature (500°C) annealing the samples. Thermoluminescent (TL) characterization of Sr 3 (PO 4 ) 2 :Eu and BaFCl:Eu under X-ray, beta and gamma irradiation have been performed. Linear TL dose dependence under irradiation dose in the mGy -Gy region was revealed, which makes these phosphors suitable also for luminescence dosimetry in the low doses region. Thus, the main characteristics of phosphors: i) the high conversion efficiency, ii) the good dose-rate proportionality, iii) the radiation stability allow to consider these materials as promising for high-energy and high dose rate dosimetry.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…

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Radioluminescent, thermoluminescent and dosimetric properties of X-ray phosphors

Ignatovych¹

2000

Semicond. Phys. Quantum Electron. Optoelectron.

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“…The image created by X-rays in this material remained stable in the dark for a long time at room temperature. This property of phosphors is widely used for manufacturing X-ray memory imaging plates (IP) in medicine, biology, and physics [2][3][4][5][6][7][8]. In the field of medicine, the use of IP significantly reduces radiation exposure in patients during X-ray diagnostics.…”

Section: Introductionmentioning

confidence: 99%

The Effect of 147 MeV 84Kr and 24.5 MeV 14N Ions Irradiation on the Optical Absorption, Luminescence, Raman Spectra and Surface of BaFBr Crystals

Akilbekov,

Kenbayev,

Dauletbekova

et al. 2024

Crystals

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Today, BaFBr crystals activated by europium ions are used as detectors that store absorbed energy in metastable centers. In these materials, the image created by X-ray irradiation remains stable in the dark for long periods at room temperature. As a result, memory image plates are created, and they are extended to other types of ionizing radiation as well. Despite significant progress towards X-ray storage and readout of information, the mechanisms of these processes have not been fully identified to date, which has hindered the efficiency of this class of phosphors. In this study, using photoluminescence (PL), optical absorption (OA), Raman spectroscopy (RS), and atomic force microscopy (AFM), the luminescence of oxygen vacancy defects to BaFBr crystals irradiated with 147 MeV 84Kr and 24.5 MeV 14N ions at 300 K to fluences (1010–1014) ion/cm2 was investigated. BaFBr crystals were grown by the Shteber method on a special device. Energy-dispersive X-ray spectroscopy (EDX) analysis revealed the presence of Ba, Br, F, and O. The effect of oxygen impurities present in the studied crystals was considered. The analysis of the complex PL band, depending on the fluence and type of ions, showed the formation of three types of oxygen vacancy defects. Macrodefects (tracks) and aggregates significantly influence the luminescence of oxygen vacancy defects. The creation of hillocks and tracks in BaFBr crystals irradiated with 147 MeV 84Kr ions is shown for the first time. Raman spectra analysis confirmed that BaFBr crystals were amorphized by 147 MeV 84Kr ions due to track overlap, in contrast to samples irradiated with 24.5 MeV 14N ions. Raman and absorption spectra demonstrated the formation of hole and electron aggregate centers upon swift heavy ions irradiation.

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“…Although many following Leonova, etc. ), studies of the X ray luminophores based on barium fluorohalo genides were continued [30,39,40,73]. Mixed barium fluorobromide iodide alloyed with europium was studied as a photostimulated X ray luminophore; an alternative method of barium fluorobromide synthesis from aqueous suspension was developed.…”

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confidence: 99%

In recognition of the 60th anniversary of the foundation of the laboratory of X-ray receivers, russian scientific center for roentgenoradiology. Part II: Records of the past, current research, and future prospects

Tombak

2006

Biomed Eng

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The onset of the third and most productive period in the activity of the Laboratory coincided with the Institute move to a new building in the southwest district of Moscow. The Laboratory during this period was equipped with unique modern X ray apparatuses and other devices. The conditions called for the use of poisonous com pounds containing tantalum, antimony, cesium, arsenic, etc. The staff of the Laboratory was supplemented with specialists in ultrasonic diagnosis: it has become evident that prospects of X ray diagnosis are associated with engi neering progress.The first International Conference on Luminescence of Rare Earth Luminophores (REL) including X ray REL was held in Leningrad in 1972 [68].At this time the Laboratory organized the All Union Symposium on Luminescence Detectors and X Ray Transducers 2 . The Symposium on Luminescence Detectors and X Ray Transducers in collaboration with Russian Academy of Sciences was held in Moscow in 1973. Since then, similar symposia are held every three years [65].This period was devoted to the search for new luminophores for roentgenography and roentgenoscopy most promising for medical diagnosis. A new classifica tion system was required. The classification system was developed at the Laboratory.According to the classification, X ray luminophore is denoted by letter R with a numerical index correspon ding to spectral emission maximum excited by X rays with Е eff = 45 keV; X ray intensifying screens are denoted by letters IS; roentgenographic and roentgenoscopic screens are denoted by letters SXR; the screen luminophore is denoted as a letter after a hyphen.A family of screens of new type was developed during the last decade. These screens were available commercial ly [12]:1) intensifying screens based on oxysulfides and oxy halogenides REE [2,31,32,36,37,42,43,67]: a) type IS Y based on yttrium oxysulfide alloyed with terbium (Р 383); b) type IS G based on gadolinium oxysulfide alloyed with terbium (Р 545); c) type IS L based on lanthanum oxybromide alloyed with terbium and ytterbium (Р 417);2) intensifying screens based on salts of oxygen con taining acids alloyed with REE [11,35,58]: a) type IS P based on barium phosphate alloyed with europium (Р 415); b) types IS SBS 1 and IS SBS 2 based on mixed strontium and barium sulfate alloyed with europium (Р 380);3) intensifying screens type IS PC based on barium fluorochloride alloyed with europium (Р 385) [34]; 4) roentgenographic and roentgenoscopic screens of SR C type based on cesium iodide alloyed with thallium (Р 540/410) [3,51]. The roentgenographic and roentgenoscopic screens of SR C type are used in domes tic X ray apparatuses Vega 320 for medical X ray diagno sis.

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Phosphors for conventional and computed radiography

Cited by 8 publications

References 14 publications

Radioluminescent, thermoluminescent and dosimetric properties of X-ray phosphors

Radioluminescent, thermoluminescent and dosimetric properties of X-ray phosphors

The Effect of 147 MeV 84Kr and 24.5 MeV 14N Ions Irradiation on the Optical Absorption, Luminescence, Raman Spectra and Surface of BaFBr Crystals

In recognition of the 60th anniversary of the foundation of the laboratory of X-ray receivers, russian scientific center for roentgenoradiology. Part II: Records of the past, current research, and future prospects

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