Scintillation detectors for x-rays

Nikl, M.

doi:10.1088/0957-0233/17/4/r01

Cited by 751 publications

(339 citation statements)

References 175 publications

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“…Attempts at multi-frame imaging with these slow detectors causes ghosting and saturation (photo bleaching) by subsequent images. 37 Improved methods for extracting data from suboptically recorded images like the ones shown in this paper provide a possible route for data analysis using detectors near their temporal limits.…”

Section: ~ 16 ~mentioning

confidence: 99%

Machine learning to analyze images of shocked materials for precise and accurate measurements

Dresselhaus-Cooper

Howard

Hock

et al. 2017

Journal of Applied Physics

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A supervised machine learning algorithm, called locally adaptive discriminant analysis (LADA), has been developed to locate boundaries between identifiable image features that have varying intensities. LADA is an adaptation of image segmentation, which includes techniques that find the positions of image features (classes) using statistical intensity distributions for each class in the image. In order to place a pixel in the proper class, LADA considers the intensity at that pixel and the distribution of intensities in local (nearby) pixels. This paper presents the use of LADA to provide, with statistical uncertainties, the positions and shapes of features within ultrafast images of shock waves. We demonstrate the ability to locate image features including crystals, density changes associated with shock waves, and material jetting caused by shock waves. This algorithm can analyze images that exhibit a wide range of physical phenomena because it does not rely on comparison to a model. LADA enables analysis of images from shock physics with statistical rigor independent of underlying models or simulations.

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Section: ~ 16 ~mentioning

confidence: 99%

Machine learning to analyze images of shocked materials for precise and accurate measurements

Dresselhaus-Cooper

Howard

Hock

et al. 2017

Journal of Applied Physics

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“…A single crystal scintillator was used to convert the X-ray signal to visible light, which can then be magnified and recorded by a high-speed optical camera. The scintillator was Lu 3 Al 5 O 12 :Ce or LuAG:Ce (Crytur Ltd, Czech Republic) with dimensions of 10 × 10 × 0.1 mm, a decay time of 45-55 ns, and an emission spectrum peak of 530 nm [27,31]. This decay time, along with the short duration of exposure to the superbunch (500 ns), was much shorter than the frame separation (n × 3.68 µs).…”

Section: Synchrotron X-rays At the Advanced Photon Sourcementioning

confidence: 99%

In situ damage assessment using synchrotron X-rays in materials loaded by a Hopkinson bar

Chen

Hudspeth

Claus

et al. 2014

Phil. Trans. R. Soc. A.

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Split Hopkinson or Kolsky bars are common high-rate characterization tools for dynamic mechanical behaviour of materials. Stress–strain responses averaged over specimen volume are obtained as a function of strain rate. Specimen deformation histories can be monitored by high-speed imaging on the surface. It has not been possible to track the damage initiation and evolution during the dynamic deformation inside specimens except for a few transparent materials. In this study, we integrated Hopkinson compression/tension bars with high-speed X-ray imaging capabilities. The damage history in a dynamically deforming specimen was monitored in situ using synchrotron radiation via X-ray phase contrast imaging. The effectiveness of the novel union between these two powerful techniques, which opens a new angle for data acquisition in dynamic experiments, is demonstrated by a series of dynamic experiments on a variety of material systems, including particle interaction in granular materials, glass impact cracking, single crystal silicon tensile failure and ligament–bone junction damage.

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“…Inorganic halide scintillators are considered to be the best among the discovered scintillators. Specially, Ce-doped inorganic halide scintillators are extensively studied and their scintillation properties are found excellent among the discovered scintillators [5,6].…”

Section: Introductionmentioning

confidence: 99%

New Tl 2 LaBr 5 : Ce 3+ crystal scintillator for γ-rays detection

Kim

Rooh

Khan

et al. 2017

Nuclear Instruments and Methods in Physics Research Section A:

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In this study we present our preliminary report on the scintillation properties of new Ce-doped Tl 2 LaBr 5 single crystal. Two zones vertical Bridgman technique is used for the growth of this compound. Pure and Ce-doped samples showed maximum emission peaks at 435 nm and 415 nm, respectively. Best light yield of 43,000±4300 ph/MeV with 6.3% (FWHM) energy resolution is obtained for 5% Ce-doped sample under γ-ray excitation. Single exponential decay time constant of 25 ns is observed for 5% Ce doped sample. Effective Z-number is found to be 67, therefore efficient detection of X-and γ-ray will be possible. Preliminary results revealed that this compound will be an ideal candidate for the medical imaging techniques. Further investigations are under way for the determination of optimized conditions of this compound.

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Scintillation detectors for x-rays

Cited by 751 publications

References 175 publications

Machine learning to analyze images of shocked materials for precise and accurate measurements

Machine learning to analyze images of shocked materials for precise and accurate measurements

In situ damage assessment using synchrotron X-rays in materials loaded by a Hopkinson bar

New Tl 2 LaBr 5 : Ce 3+ crystal scintillator for γ-rays detection

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