A5036981428- Radiation Detection and Scintillator Technologies
- Advanced Radiotherapy Techniques
- Radiation Therapy and Dosimetry
- Luminescence Properties of Advanced Materials
- Digital Radiography and Breast Imaging
- Electron Spin Resonance Studies
- Nuclear materials and radiation effects
- Medical Imaging Techniques and Applications
- Terahertz technology and applications
- Inorganic Chemistry and Materials
- Solid-state spectroscopy and crystallography
- Perovskite Materials and Applications
- Nuclear Physics and Applications
- Radiation Effects in Electronics
- Advanced Chemical Physics Studies
- Advanced X-ray and CT Imaging
- Radiation Effects and Dosimetry
- Quantum Dots Synthesis And Properties
- Advanced NMR Techniques and Applications
- Advanced MRI Techniques and Applications
- Plant and animal studies
- Atomic and Subatomic Physics Research
- Nuclear Materials and Properties
- Boron Compounds in Chemistry
- Inorganic Fluorides and Related Compounds
Agfa-Gevaert (Belgium)
2007-2024
Agfa HealthCare
2011-2012
Three quantum dot luminescent solar concentrators (QDLSCs) are constructed to assess their performance in an outdoor environment over entire year. The QDLSCs have a PMMA‐Kraton‐PMMA sandwich structure with either InP/ZnSe/ZnS, , or CdSe/CdS/ZnS core/shell dots incorporated the Kraton interlayer. Furthermore, two reference LSCs included: one using Lumogen F Red 305 as luminophore and without layer. power conversion efficiency is assessed for cloudy sunny day, showing influence of diffuse...
The objective of this work is to demonstrate the feasibility 2D dosimetry using optically stimulated luminescent (OSL) films based on MgB4O7:Ce,Li and identify current limitations material for application. A small quantity test was produced read a laser-scanning OSL reader after irradiation. luminescence dosimetric properties were also investigated. results advantage fast lifetime associated with Ce3+ emission (∼31.5 ns) readout, since it minimizes need pixel-bleeding correction. signal...
The objective of this work is to review and assess the potential MgB4O7:Ce,Li fill in gaps where need for a new material optically stimulated luminescence (OSL) dosimetry has been identified. We offer critical assessment operational properties OSL dosimetry, as reviewed literature complemented by measurements thermoluminescence spectroscopy, sensitivity, thermal stability, lifetime emission, dose response at high doses (>1000 Gy), fading bleachability. Overall, compared with Al2O3:C,...
Dosimetry is crucial in radiotherapy to warrant safe and correct treatment. In FLASH radiotherapy, where ultra-high dose rates (UHDRs) are used, the dosimetric demands more stringent, requiring development investigation of new dosemeters. this study, three prototype fiber-optic dosemeters (FODs)—an inorganic, an organic–inorganic hybrid metal halide, organic (plastic) scintillator optimized investigated for UHDR electron irradiations. The plastic FOD developed by Medscint, whereas others...
${\text{CsBr:Eu}}^{2+}$ needle image plates exhibit an electron-paramagnetic-resonance (EPR) spectrum at room temperature (RT), whose intensity is correlated with the photostimulated luminescence sensitivity of plate. This EPR shows a strong dependence: At RT it owing to single ${\text{Eu}}^{2+}$ ($S$ $=7/2$) center axial symmetry, whereas $T<35$ K spectra can only be explained when two distinct centers are assumed present, minority and majority nearly extremely rhombic symmetry. In this...
Real time radioluminescence fibre-based detectors were investigated for application in proton, helium, and carbon therapy dosimetry. The Al2O3:C probes are made of one single crystal (1 mm) two droplets micro powder sizes (38 μm 4 μm) mixed with a water-equivalent binder. fibres irradiated behind different thicknesses solid slabs, the Bragg curves presented quenching effect attributed to nonlinear response (RL) signal as function linear energy transfer (LET). Experimental data Monte Carlo...
There is a continual need for more accurate and effective dosimetric systems quality assurance (QA) as radiotherapy evolves in complexity. The purpose of this project was to introduce new system that minimally perturbs the main beam, while assessing its real time 2D dose-rate field shapes. combined reusability, linear response, high spatial resolution single radiation detection technology can be applied surface dose estimation QA.
The storage phosphor RbBr:Tl<SUP>+</SUP> can be grown in needles via vacuum deposition. Thanks to reduced lateral light diffusion thick needle screens still offer acceptable resolution. Due its low intrinsic X-ray absorption, however, a screen does not lead better absorption/resolution compromise than BaFBr<SUB>1-x</SUB>I<SUB>x</SUB>:Eu<SUP>2+</SUP> powder screen. CsBr:Eu<SUP>2+</SUP> combine high specific absorption and the possibility of growth. Its blue emission, peaking at 440 nm near IR...
The x-ray storage phosphor BaFBr:Eu2+ may be made sensitive to stimulation further into the infrared by doping with Ca2+ or Sr2+. This enables use of light-emitting diodes instead gas lasers for photostimulation. It is shown electron paramagnetic resonance (EPR), nuclear double (ENDOR), and optically detected EPR ENDOR that upon x irradiation FA(Br−, Ca2+) centers are formed as photostimulable traps in Ca2+-doped BaFBr, which one two nearest Ba2+ neighbors along c axis replaced Ca2+. center...
Needle image plates (NIPs) based on CsBr:Eu are a good alternative to the BaFBr:Eu powder due their higher sensitivity and improved spatial resolution. The x-ray radiation stability of NIPs produced by Agfa Gevaert was investigated it found that optimized is as high commercial CsI:Tl single crystals much than reported in literature for NIPs. dependence accumulated dose determined three different types irradiation. It shown degradation starts at about 10 Gy strongest most hard beam. If energy...
Vacuum-deposited CsBr needle plates doped with ${\text{Eu}}^{2+}$ have been investigated $Q$ $(\ensuremath{\sim}34\text{ }\text{GHz})$ and $W$ $(\ensuremath{\sim}95\text{ band electron paramagnetic resonance in a large temperature interval (4 K: room temperature). At low temperatures $(<35\text{ }\text{K})$, two Eu-related centers were found different symmetry (tetragonal orthorhombic), while earlier studies at only one center was tetragonal symmetry. Possible models for the three defects...
The structure of Eu${}^{2+}$ monomer centers in CsBr single crystals is investigated using electron paramagnetic resonance (EPR) spectroscopy. These are produced by heating the melt-grown above 600 K vacuum followed a rapid quench to room temperature (RT) or 77 K. angular dependence their EPR spectrum demonstrates that these have cubic symmetry. At RT decays aggregation ions. This strongly contrasts with situation for CsBr:Eu needle image plates synthesized physical vapor deposition, where...
The oxygen-free x-ray storage phosphor BaFBr, doped with Sr2+ and having Br− vacancies due to fluorine excess, is shown have a high photostimulability shifted appreciably lower photon energy compared nondoped BaFBr because of the predominant generation FA(Sr2+) centers on sublattice upon room-temperature x irradiation. FA(Br−,Sr2+) are less stable than unperturbed F(Br−) centers. Therefore, redshift disappears thermal activation above room temperature. From failure observe an F center...
Needlelike CsBr:Eu x-ray storage phosphor plates exhibit an excellent sensitivity as expressed by their photostimulated luminescence (PSL) intensity and have ever growing applications in medical radiography. An earlier electron paramagnetic resonance (EPR) study revealed spectra due to a Eu2+ center with axial ⟨100⟩ symmetry. In this work, its EPR is shown linear correlation the PSL of plates. It can thus be expected that structural information retrieved from related techniques may...