Perovskite detectors for x-ray imaging and gamma spectroscopy: overview and current state-of-the-art

2021 ◽  
Author(s):  
Lei R. Cao ◽  
Lei Pan ◽  
Praneeth Kandlakunta ◽  
Wanyi Nie
Keyword(s):  
State Of The Art ◽  
Gamma Spectroscopy ◽  
X Ray ◽  
Current State ◽  
X Ray Imaging

scholarly journals 2D perovskite-based high spatial resolution X-ray detectors

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Amlan Datta ◽  
John Fiala ◽  
Shariar Motakef
Keyword(s):  
Spatial Resolution ◽  
High Spatial Resolution ◽  
State Of The Art ◽  
Frame Rate ◽  
Modulation Transfer ◽  
Large Area ◽  
X Ray ◽  
Current State ◽  
X Ray Imaging ◽  
Imaging Results

AbstractX-ray radiography is the most widely used imaging technique with applications encompassing medical and industrial imaging, homeland security, and materials research. Although a significant amount of research and development has gone into improving the spatial resolution of the current state-of-the-art indirect X-ray detectors, it is still limited by the detector thickness and microcolumnar structure quality. This paper demonstrates high spatial resolution X-ray imaging with solution-processable two-dimensional hybrid perovskite single-crystal scintillators grown inside microcapillary channels as small as 20 µm. These highly scalable non-hygroscopic detectors demonstrate excellent spatial resolution similar to the direct X-ray detectors. X-ray imaging results of a camera constructed using this scintillator show Modulation Transfer Function values significantly better than the current state-of-the-art X-ray detectors. These structured detectors open up a new era of low-cost large-area ultrahigh spatial resolution high frame rate X-ray imaging with numerous applications.

scholarly journals Thomson linac-based X-ray generator: a primer for theory and design

2016 ◽  
Vol 34 (4) ◽  
pp. 637-644 ◽  
Author(s):  
I.A. Artyukov ◽  
E.G. Bessonov ◽  
M.V. Gorbunkov ◽  
Y.Y. Maslova ◽  
N.L. Popov ◽  
...  
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Laser Radiation ◽  
Conceptual Design ◽  
Large Scale ◽  
State Of The Art ◽  
Thomson Scattering ◽  
Powerful Laser ◽  
X Ray ◽  
X Ray Imaging

AbstractThe paper presents a general theoretical framework and related Monte Carlo simulation of novel type of the X-ray sources based on relativistic Thomson scattering of powerful laser radiation. Special attention is paid to the linac X-ray generators by way of two examples: conceptual design for production of 12.4 keV photons and presently operating X-ray source of 29.4 keV photons. Our analysis shows that state-of-the-art laser and accelerator technologies enable to build up a compact linac-based Thomson source for the same X-ray imaging and diffraction experiments as in using of a large-scale X-ray radiation facility like a synchrotron or Thomson generator based on electron storage ring.

In‐Situtime‐resolved X‐ray diffraction: The current state of the art

2002 ◽  
Vol 15 (4) ◽  
pp. 4-13 ◽  
Author(s):  
Ann E. Terry ◽  
Gavin B. M. Vaughan ◽  
Åke Kvick ◽  
Richard I. Walton ◽  
Alexander J. Norquist ◽  
...  
Keyword(s):  
State Of The Art ◽  
X Ray Diffraction ◽  
X Ray ◽  
Current State

Thermoelectric Properties of C-Axis-Oriented Ca3Co4O9+δ Films Grown on MgO-Buffered Si (100) by PLD Technique

2010 ◽  
Vol 29-32 ◽  
pp. 1913-1918
Author(s):  
Xia Zhang ◽  
Hong Chen ◽  
Qiu Hui Liao ◽  
Xia Li
Keyword(s):  
Thin Films ◽  
State Of The Art ◽  
Pulsed Laser ◽  
Buffer Layers ◽  
Laser Deposition ◽  
X Ray Diffraction ◽  
High Quality ◽  
X Ray ◽  
Current State ◽  
Good Crystallinity

High-quality c-axis-oriented Ca3Co4O9+δ thin films have been grown directly on Si (100) wafers with inserting MgO buffer layers by pulsed-laser deposition (PLD). X-ray diffraction and scan electron microscopy show good crystallinity of the Ca3Co4O9+δ films. The resistivity and Seebeck coefficient of the Ca3Co4O9+δ thin films on Si (100) substrates are 9.8 mΩcm and 189 μV/K at the temperature of 500K, respectively, comparable to the single-crystal samples. This advance demonstrates the possibility of integrating the cobaltate-based high thermoelectric materials with the current state-of-the-art silicon technology for thermoelectricity-on-a-chip applications.

scholarly journals Pixel detectors for diffraction-limited storage rings

2014 ◽  
Vol 21 (5) ◽  
pp. 1006-1010 ◽  
Author(s):  
Peter Denes ◽  
Bernd Schmitt
Keyword(s):  
Synchrotron Radiation ◽  
Storage Ring ◽  
Dynamic Range ◽  
State Of The Art ◽  
Storage Rings ◽  
X Rays ◽  
X Ray ◽  
Current State ◽  
Pixel Detectors ◽  
Radiation Sources

Dramatic advances in synchrotron radiation sources produce ever-brighter beams of X-rays, but those advances can only be used if there is a corresponding improvement in X-ray detectors. With the advent of storage ring sources capable of being diffraction-limited (down to a certain wavelength), advances in detector speed, dynamic range and functionality is required. While many of these improvements in detector capabilities are being pursued now, the orders-of-magnitude increases in brightness of diffraction-limited storage ring sources will require challenging non-incremental advances in detectors. This article summarizes the current state of the art, developments underway worldwide, and challenges that diffraction-limited storage ring sources present for detectors.

scholarly journals Two-dimensional imaging detectors for structural biology with X-ray lasers

2014 ◽  
Vol 369 (1647) ◽  
pp. 20130334 ◽  
Author(s):  
Peter Denes
Keyword(s):  
Structural Biology ◽  
Peak Power ◽  
State Of The Art ◽  
High Peak Power ◽  
Free Electron Lasers ◽  
X Ray ◽  
The Past ◽  
Current State ◽  
Pixel Detectors ◽  
Imaging Detectors

Our ability to harness the advances in microelectronics over the past decade(s) for X-ray detection has resulted in significant improvements in the state of the art. Biology with X-ray free-electron lasers present daunting detector challenges: all of the photons arrive at the same time, and individual high peak power pulses must be read out shot-by-shot. Direct X-ray detection in silicon pixel detectors—monolithic or hybrid—are the standard for XFELs today. For structural biology, improvements are needed for today's 10–100 Hz XFELs, and further improvements are required for tomorrow's 10+ kHz XFELs. This article will discuss detector challenges, why they arise and ways to overcome them, along with the current state of the art.

scholarly journals Detection of Covid-19 with X-ray Images using Deep and Machine Learning

2021 ◽  
pp. 596-599
Author(s):  
Prof. Dr. Rajalakshmi M C ◽  
Bhuvana Sahi M ◽  
Bindu P ◽  
Pavan Kumar N ◽  
Pramod Athrey A
Keyword(s):  
Transfer Learning ◽  
Medical Image ◽  
State Of The Art ◽  
Medical Community ◽  
Network Architectures ◽  
X Rays ◽  
Community Based ◽  
X Ray ◽  
X Ray Imaging ◽  
Medical Image Classification

In this study, a dataset of X-ray images from patients with confirmed Covid -19 disease, and normal incidents, was utilized for the automatic detection of the Coronavirus disease. The aim of the study is to evaluate the performance of state-of-the-art convolutional neural network architectures proposed over the recent years for medical image classification. Specifically, the procedure called Transfer Learning was adopted. With transfer learning, the detection of various abnormalities in small medical image datasets is an achievable target, often yielding remarkable results. The datasets utilized in this experiment are Firstly, a collection of 5222 X-ray images including 3875 images with confirmed Covid -19 disease and 1347 images of normal conditions. The data was collected from the available X-ray images on public medical repositories. The results suggest that Deep Learning with X-ray imaging may extract significant biomarkers related to the Covid -19 disease, while the best accuracy, sensitivity, and specificity obtained is 96.78%, 98.66%, and 96.46% respectively. Since by now, all diagnostic tests show failure rates such as to raise concerns, the probability of incorporating X -rays into the diagnosis of the disease could be assessed by the medical community, based on the findings, while more research to evaluate the X-ray approach from different aspects may be conducted.

scholarly journals Phase Formation in Heterovalent Equimolar Quinary Oxide Systems of ZrO2-HfO2-CeO2-Nb2O5-RE2O3 Type (RE = Y, Yb, Nd, Gd)

Ceramics ◽  
2021 ◽  
Vol 4 (3) ◽  
pp. 476-485
Author(s):  
Vasile-Adrian Surdu ◽  
Ecaterina Andronescu
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Phase Formation ◽  
State Of The Art ◽  
Oxide Systems ◽  
X Ray ◽  
Current State ◽  
Fluorite Type ◽  
Compositional Space ◽  
Scanning Electron

Tailoring electrical and mechanical properties in the fluorite oxides family is of great interest for technological applications. Other than doping and substitution, entropy-driven stabilization is an emerging technique for new solid solutions formation and enhancing or exploring new functionalities. However, there is a high number of possible combinations for higher-order diagram investigations, and the current state of the art shows limited possibilities in predicting phase formation and related properties. In this paper, we expand the compositional space of fluorite oxides in ZrO2-HfO2-CeO2-Nb2O5-RE2O3 systems. X-ray diffractometry and scanning electron microscopy measurements showed the formation of cubic fluorite-type structures when processing compositions at 1600 °C.

Sign in / Sign up

Export Citation Format

Share Document