Direct X-ray Research Articles

Nanocrystalline CaWO4 and ZnWO4 Tungstates for Hybrid Organic-Inorganic X-ray Detectors.

Hybrid materials combining an organic matrix and high-Z nanomaterials show potential for applications in radiation detection, allowing unprecedented device architectures and functionality. Herein, novel hybrid organic-inorganic systems were produced using a mixture of tungstate (CaWO4 or ZnWO4) nanoparticles with a P3HT:PCBM blend. The nano-tungstates with a crystallite size of 43 nm for CaWO4 and 30 nm for ZnWO4 were synthesized by the hydrothermal method. Their structure and morphology were characterized by X-ray diffraction and scanning electron microscopy. The hybrid systems were used to fabricate direct conversion X-ray detectors able to operate with zero bias voltage. The detector performance was tested in a wide energy range using monochromatic synchrotron radiation. The addition of nanoparticles with high-Z elements improved the detector response to X-ray radiation compared with that of a pure organic P3HT:PCBM bulk heterojunction cell. The high dynamic range of our detector allows for recording X-ray absorption spectra, including the fine X-ray absorption structure located beyond the absorption edge. The obtained results suggest that nanocrystalline tungstates are promising candidates for application in direct organic-inorganic X-ray detectors.

Evaluation of the findings affecting the treatment decision in cases of adhesive intestinal obstruction

To establish a standard approach in patient management by determining the parameters that affect the decision of surgical or conservative treatment in adhesive small bowel obstructions. 94 patients who were admitted to the emergency department with symptoms of ileus and were diagnosed with adhesive intestinal obstruction according to clinical, examination and imaging findings were grouped as patients who were followed up with conservative methods (Group 1) and patients who underwent surgery (Group 2). All patients' laboratory values (hemoglobin, white blood cell (WBC), C- reactive protein (CRP), Blodd urea nitrogen (BUN)/creatinin, sodium, potassium, Lactate dehydrogenase (LDH), lactate and amylase) and imaging findings (air-fluid level in direct abdominal X-ray, increase in small intestine diameter (≥3.95 cm) in computerized tomography), wall thickness increase (>3mm), transition zone, fecal sign, and presence of contrast in the colon) were evaluated, and criteria for early surgery and non-operative follow-up-treatment criteria were determined. 72% (n:68) of the patients were classified as Group 1 and 28% (n:26) as Group 2, and no significant difference was found between the groups according to age and gender. Surgical treatment with increased lactate (r:0.326, p=0.001), diameter increase in the small intestine (r:0.299, p=0.003) and wall thickness increase (r:0.540, p<0.001), change in air-fluid levels on direct X-ray ( A significant correlation was found between r:-0.291, p=0.004) and contrast transfer to the colon on tomography (r:-0.668, p<0.001) and the decision for conservative treatment. Although adhesive intestinal obstruction is a condition that can mostly be managed non-operatively, the early surgical decision significantly reduces mortality and morbidity in cases with an operation indication. It was concluded that the standard approach protocol based on laboratory and imaging findings determined in the non-operative or operative treatment management helps in the differential diagnosis and early surgical decision and reduces the length of stay of the patient.

Research Progress of Direct Perovskite X-ray Detector Based on Material Regulation

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Solvent engineering of MAPbI3 perovskite thick film for a direct X-ray detector.

The emergence of organic-inorganic hybrid perovskites with a high μτ product and a high absorption coefficient has made it possible to adopt an aerosol-liquid-solid technology for direct X-ray detectors. The film quality from the ALS process is often compromised, especially on the film surface, when deposited in ambient conditions with uncontrolled humidity. Herein we develop a solvent engineering strategy in the ALS process to obtain high-quality MAPbI3 thick films. The key is the introduction of a molecular additive to intervene and regulate the perovskite crystallization process so that the negative effect of the ALS ambience is minimized. This strategy allows us to prepare direct X-ray detectors with much reduced dark current, enhanced response speed and improved overall performance.

Characteristics and management of patients undergoing emergency surgery for diabetic foot attack.

Diabetic foot attack (DFA) is considered one of the worst manifestations of diabetic foot. It is necessary to act quickly to prevent amputation and save the patient's life. The aim of this study is to reveal the characteristic features of DFAs and be a guide to healthcare professionals to manage and refer these patients. Sixty-five patients with DFAs were analyzed retrospectively. Demographics were collected. All patients' ınfectious dis-eases Society of America/International Working Group on the Diabetic Foot (IDSA/IWDGF) stages, site ıschemia neuropathy, bacterial ınfection and depth (SINBAD) and laboratory risk ındicator for necrotizing fasciitis (LRINEC) scores were calculated. According to these measurements, patients were categorized and statistical results were obtained. We found that patients who underwent emergency surgery due to DFA applied to an average of two hospitals before applying to our facility and the median acceptance time since the beginning of the first complaint was 9 days. All patients were IDSA/IWDGF stages three and four. Most of the patients had SINBAD scores between four and six. 60% of the patients were at high risk for necrotizing fasciitis according to the LRINEC score. 58.2% of patients had periferic arterial stenosis and the amputation rate was 69.2%. 21.3% of the patients were followed in the intensive care unit, and our patients' mortality rate was 4.2%. DFA is an emergency surgical condition that requires high clinical suspicion. If not diagnosed and treated with emergency surgery, it has a high mortality and amputation rate. High white blood cell count in patients, local and systemic signs of inflammation, presence of subcutaneous emphysema in the lower extremities on a direct X-ray radiography, and high blood sugar should be considered as warning signs for DFA. Emergency surgical intervention should be performed on these patients, and if the patient is not in a suitable center for emergency surgery, they should be rapidly referred to a center with experienced clinicians.

Orthorhombic undoped κ-Ga2O3 epitaxial thin films for sensitive, fast, and stable direct X-ray detectors

X-ray photoresponse of κ-Ga2O3 is investigated for the first time. Results show that κ-Ga2O3 is a versatile material for the development of high-performance direct X-ray detectors.

Фазовые переходы в фрустрированном кобальтите TmBaCo-=SUB=-4-=/SUB=-O-=SUB=-7-=/SUB=-

For the first time, changes in lattice parameters (metrics) during a structural transition in stoichiometric cobalt TmBaCo4O7+x with x~ 0 (iodometric titration method) obtained by quenching from 900-950oC were investigated by direct X-ray method. It was found that during the structural transition TS~220-240 K, the Delta a/a parameter does not detect any features, parameters b and c experience jumps of different sign and different magnitude Delta b/b~3.5·10-3 and Delta c/c~-4.0·10-3, which leads to a jump in the volume of Delta V/V~ -0.5·10-3. The distortion value eo ~ -3.5·10-3 remains constant with increasing temperature and disappears abruptly during the transition.The distortion of the structure is accompanied by abnormal behavior of the Young's Delta E(T)/E0 module in the TS region. In the region of the expected magnetic phase transition of the cobalt subsystem, anomalies on the Young's modulus curve Delta E(T)/E0 were not detected, and a strong absorption peak at T~ 96 K on the internal friction dependence q-1(T) is, apparently, a sign of a developed short-range order.

Wrist radiography for hand bone age tells a lot; a girl with SHOX deficiency

Madelung's deformity (MD) occurs as a result of premature closure of the medial and volar aspects of the distal radial physis.1 It is more frequent and severe in girls, and usually develops in middle/late childhood.2 MD is one of the most characteristic features of he short-stature homeobox gene (SHOX) deficiency, which causes short stature3. Radial bowing is one of the well-known radiological futures. On the other hand, there are three typical radiological sign of the hand radiograph for SHOX deficiency; triangularization, pyramidalization of the os lunatum, and radiolucency at the distal radius4.
 In the evaluation of a 9-year-old girl who was investigated for precocious puberty, her height measurement was 18th percentile. On the wrist X-ray taken for the determination of the bone age of the patient, there was an appearance compatible with MD (Figure 1). In the genetic studies of the patient with MD, normal female karyotyping (46, XX) was demonstrated by Trypsin G banding Technique. Heterozygous SHOX deletion was detected by Fluorescence In Situ Hybridization technique using a probe specific to the SHOX gene region (Xp22.33).
 Interpreting the direct X-ray is important in recognizing the MD. Thus, it will be easier to detect SHOX gene deletion in the etiology of short stature patients with this deformity.

A-Site Cation Engineering of Ruddlesden–Popper Perovskites for Stable, Sensitive, and Portable Direct Conversion X-ray Imaging Detectors

Perovskite flat-panel X-ray detectors are promising products for realizing low-dose medical imaging, a nondestructive test, and security inspection. However, the perovskite X-ray imager still faces intractable problems such as severe baseline drift, a low signal-to-noise ratio, and rapid performance degradation, which were involved by the notorious intrinsic ion migration of the perovskite functional layer. In this work, sensitive, stable, and portable pixel quasi-two-dimensional (2D) Ruddlesden-Popper (RP) perovskite X-ray imagers were obtained by an advanced solvent-free laminated fabrication approach. A-Site cation engineering of RP perovskites provides a hint for solving the trade-off between stability and detection performance, resulting in a stable pixel X-ray imager that shows a sensitivity of ∼7000 μC Gyair-1 cm-2, a detection limit of 7.8 nGyair s-1, and good 2D multipixel X-ray imaging. This work demonstrates both a high-performance, stable X-ray imager and its robust fabrication, paving the way for adopting a RP perovskite imager as novel flat-panel X-ray detectors.

Flexible perovskite scintillators and detectors for X-ray detection.

X-ray detection and imaging technology has been rapidly developed for various fields since 1895, offering great opportunities to scientific and industrial communities. Particularly, flexible X-ray detectors have drawn numerous attention in medical-related applications, solving the uniform issues of traditional rigid X-ray detectors. Out of all the potential materials, metal halide perovskites (MHPs) have been emerged as excellent candidates as flexible X-ray scintillators and detectors owing to the advantages including low temperature solution processable, strong X-ray absorption coefficient, large mobility lifetime product and tunable bandgap. In this review, the recent advances of MHP-based flexible X-ray detectors are comprehensively summarized, focusing on the scalable synthesis technologies of materials and diverse device architectures, and covering both direct and indirect X-ray detection. A brief outlook that highlights the current challenges impeding the commercialization of flexible MHP-based X-ray detectors is also included with possible solutions to those problem being provided.

Cu(II) complexes as catalyst precursors in the process of selective hydrogenation of diene hydrocarbons

The reaction of copper(II) acetate with 3-furancarboxylic acid (Hfur) and 5-nitro-2-furancarboxylic acid (Hnfur) with participation of 4-phenylpyridine (phpy) in acetonitrile resulted in mononuclear complexes [Cu(L)2(phpy)2(H2O)]·solv (L = fur (1), nfur (2); solv = phpy (1)) whose structures were determined by direct single crystal X-ray analysis. According to X-ray data, the complexing component in 1 and 2 is in a distorted square-pyramidal environment (CuN2O3); the pyramid base is formed by monodentate-bound oxygen atoms of fur-/nfur- anions and a pair of nitrogen atoms of the phpy moieties, while the water molecule occupies an axial position. It was found for the first time that copper nanoparticles immobilized on the surface of γ-Al2O3 obtained by chemical reduction of 1 and 2 (pre-deposited on the surface from solution) with sodium tetrahydroborate show high selectivity of monohydrogenation of tricyclo[5.2.1.02,6]deca-3,8-diene (dicyclopentadiene, DCPD) to give tricyclo[5.2.1.02,6]dec-4-ene (5,6-dihydrocyclopentadiene, DHDCPD). The catalytic activity tests show high selectivity (up to 100 %) of the catalysts studied in the reaction of partial hydrogenation to DHDCPD under continuous process conditions even at high conversion values (up to 96 %) and with hydrogen present in excess. Thermal behavior of 1 and 2 was studied by simultaneous thermal analysis (STA).

PbI2 -DMSO Assisted In Situ Growth of Perovskite Wafers for Sensitive Direct X-Ray Detection.

Although perovskite wafers with a scalable size and thickness are suitable for direct X-ray detection, polycrystalline perovskite wafers have drawbacks such as the high defect density, defective grain boundaries, and low crystallinity. Herein, PbI2 -DMSO powders are introduced into the MAPbI3 wafer to facilitate crystal growth. The PbI2 powders absorb a certain amount of DMSO to form the PbI2 -DMSO powders and PbI2 -DMSO is converted back into PbI2 under heating while releasing DMSO vapor. During isostatic pressing of the MAPbI3 wafer with the PbI2 -DMSO solid additive, the released DMSO vapor facilitates in situ growth in the MAPbI3 wafer with enhanced crystallinity and reduced defect density. A dense and compact MAPbI3 wafer with a high mobility-lifetime (µτ) product of 8.70 × 10-4 cm2 V-1 is produced. The MAPbI3 -based direct X-ray detector fabricated for demonstration shows a high sensitivity of 1.58 × 104 µC Gyair-1 cm-2 and a low detection limit of 410 nGyair s-1 .

Zn(Li)O nanorods for direct conversion X-ray sensors in the intra-oral energy range

Zn(Li)O nanorods for direct conversion X-ray sensors in the intra-oral energy range

Recent advances in metal-organic frameworks for X-ray detection

Metal-organic frameworks (MOFs) are a class of fascinating supramolecular crystalline materials that have been widely developed for catalysis, gas storage, illumination, drug delivery/cytoprotection, and so on. Recently, MOFs have been found to have potential applications in X-ray detection due to their high sensitivity, fast response time, high absorption coefficient, and radiation stability. In this review, we present an overview on the fundamental mechanism of using MOFs for X-ray scintillation. We further discuss the recent developments in X-ray detection based on indirect X-ray scintillation and direct X-ray conversion. Finally, we provide a summary and a perspective on the future of this promising research field.

Review: Perovskite X-ray Detectors (1997–Present)

Perovskite materials have attracted extensive attention because of their superior performance in the fields of photoelectric detection, photovoltaics, light-emitting diodes, metal–air batteries, etc. However, their development and application in the field of X-ray detectors have not been reviewed. In this paper, research on perovskite-based X-ray detectors is analyzed using the bibliometric method. This analysis sample includes the literature from 1997 to the present. In addition, the research status of perovskite-based scintillators and direct X-ray detectors under different crystallization conditions and different preparation methods is discussed. Finally, several problems that need to be overcome in the future of perovskite-based X-ray detectors are put forward.

X-ray sensors based on micro/ nano CeO2 segregated AgBiS2 for low dose detection

Semiconductor-based direct conversion X-ray sensors have widespread applications spanning from medical diagnosis to industrial inspection. However, current findings on X-ray detection based on perovskites shows high sensitivity but exhibit large leakage current and poor stability, thus, inhibiting them from commercialization. Highly stable AgBiS 2 with large attenuation coefficient (μ = 3.07 g cm −2 at 70 keV), shows excellent charge conversion due to its higher atomic number (Bi, Z = 83), and density (ρ = 7.02 g cm −3 ) was used for X-ray detection. Here, we approach to enhance the net sensitivity of AgBiS 2 by tailoring all three parameters by segregating micro/ nanocrystals of cerium oxide (CeO 2 ) at the AgBiS 2 grain boundary (GB) region. From the X-ray impinged photocurrent response, substantial GB segregation of n-CeO 2 at the AgBiS 2 interface leads to improved attenuation and promotes the conversion of multiple scattered X-ray photons into electrons by interacting with the adjacent grains, thus resulting in enhanced photocurrent generation. The sensitivity (S) and noise equivalent dose (NED) ratio were calculated to determine the lowest detectivity of the sensor with less generated noise signals. From these experimental findings, 10 % of n-CeO 2 segregation leads to an improvement in the sensitivity of AgBiS 2 to 29 μC mGy −1 cm −3 . • X-ray sensors were fabricated with micro/ nano CeO 2 segregated AgBiS 2 thick films. • Multiple scattered X-ray photons at the AgBiS 2 grain boundary region were effectively utilized by nano CeO 2 grains, resulting in higher charge carrier generation. • X-ray impinged photocurrent measurement revealed nano CeO 2 :AgBiS 2 presents record sensitivity 29.3 μC mGy −1 cm −3 for 7.97 mGy dose.

Direct X-ray Detectors Based on PDMS Films With Low Detection Limit and High Flexibility

The excellent mechanical properties of Polydimethylsilane (PDMS) has been widely used in hybrid flexible photodetectors, but there is hardly any research on it as the active layer of the direct X-ray detectors. In this letter, the low detection and high flexibility X-ray detector was fabricated based on pure PDMS. The metal/polymer/metal (MPM) vertical structure detector has a detection limit of 49.69 nGy <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$_{air}\text{s}$ </tex-math></inline-formula> −1. Carrier migration occurs in PDMS under X-ray irradiation with the sensitivity of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$57.7~\mu \text{C}$ </tex-math></inline-formula> Gy <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$_{air}^{-1}$ </tex-math></inline-formula> cm−2 at the electric field of 2 V/ <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mu \text{m}$ </tex-math></inline-formula> and the dose rate of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$23.9~\mu $ </tex-math></inline-formula> Gy <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$_{air}$ </tex-math></inline-formula> s−1. The device still maintains a good performance after bending tests (different bending radius and 10000 cycles). This work provides a new possibility for the next development of direct X-ray detectors.

Characterization of High-Flux CdZnTe with optimized electrodes for 4th generation synchrotrons

In this collaboration work between IMEM-CNR and the ESRF, we explore the potential of the Redlen Technologies High-Flux Cadmium Zinc Telluride (HF-CZT) material for direct X-ray detection at fluxes ranging from 10+7 to 10+12 photons mm−2 s−1. HF-CZT single crystals with optimized electroless gold and sputtered platinum electrodes are characterized both under dark conditions and under X-ray irradiation. We report low leakage current under dark conditions (<100 pA/mm2 at 5 kV/cm). We also report good linearity (R 2 > 0.999) under moderate to high incident X-ray flux (10+7 to 10+10 photons mm−2 s−1) as well as good stability and reproducibility for incident X-ray fluxes up to 10+12 photons mm−2 s−1. Finally, we study transient phenomena in the seconds time range and report fast stabilization time (<200 ms) and negligible afterglow in this time range.

Topological models to infer multiphase interstellar medium properties

Context.Spectroscopic observations of high-redshift galaxies slowly reveal the same complexity of the interstellar medium (ISM) as expected from resolved observations in nearby galaxies. While providing, in principle, a wealth of diagnostics concerning galaxy evolution, star formation, or the nature and influence of compact objects, such high-zspectra are often spatially and spectrally unresolved, and inferring reliable diagnostics represents a major obstacle. Bright, nearby, unresolved galaxies observed in the optical and infrared domains provide many constraints to design methods to infer ISM properties, but they have so far been limited to deterministic methods and/or with simple topological assumptions (e.g., single 1D model).Aims.It is urgent to build upon previous ISM multiphase and multicomponent methods by using a probabilistic approach that makes it possible to derive probability density functions for relevant parameters while also enabling a large number of free parameters with potential priors. The goal is to provide a flexible statistical framework that is agnostic to the model grid and that considers either a few discrete components defined by their parameter values and/or statistical distributions of parameters. In this paper, we present a first application with the objective to infer probability distributions of several physical parameters (e.g., the mass of H0, H2, escape fraction of ionizing photons, and metallicity) for the star-forming regions of the metal-poor dwarf galaxy I Zw 18 in order to confirm the low molecular gas content and high escape fraction of ionizing photons from Hiiregions.Methods.We present a Bayesian approach to model a suite of spectral lines using a sequential Monte Carlo method provided by the Python package PyMC which combines several concepts such as tempered likelihoods, importance sampling, and independent Metropolis-Hastings chains. The algorithm, provided by the associated code MULTIGRIS, accepts a few components which can be represented as sectors around one or several stellar clusters, or continuous (e.g., power-law, normal) distributions for any given parameter. We applied this approach to a grid of models calculated with the photoionization and photodissociation code Cloudy in order to produce topological models of I Zw 18.Results.The statistical framework we present makes it possible to consider a large number of spectroscopic tracers, with the extinction and systematic uncertainties as potential additional random variables. We applied this technique to the galaxy I Zw 18 in order to reproduce and go beyond previous topological models specifically tailored to this object. While our grid is designed for global properties of low-metallicity star-forming galaxies, we were able to calculate accurate values for the metallicity, number of ionizing photons, masses of ionized and neutral hydrogen, as well as the dust mass and the dust-to-gas mass ratio in I Zw 18. We find a relatively modest amount of H2(~105M⊙) which is predominantly CO-dark and traced by C+rather than C0. Nevertheless, more than 90% of the [Cii] emission is associated with the neutral atomic gas. Our models confirm the necessity to include an X-ray source with an inferred luminosity in good agreement with direct X-ray observations. Finally, we investigate the escape fraction of ionizing photons for different energy ranges. While the escape fraction for the main Hiiregion lies around 50–65%, we show that most of the soft X-ray photons are able to escape and may play a role in the ionization and heating of the circumgalactic or intergalactic medium.Conclusions.Multicomponent ISM models associate a complex enough distribution of matter and phases with a simple enough topological description to be constrained with probabilistic frameworks. Despite ignoring effects such as reflected light, the diffuse radiation field, or ionization by several non-cospatial sources, they remain well adapted to individual Hiiregions and to star-forming galaxies dominated by one or a few Hiiregions, and the improvement due to the combination of several components largely compensates for other secondary effects.

Design of X-ray energy detector

Energy is an essential key element in the process of human survival and development. With the development and progress of science and technology, human beings pushed the age to the industrial period by discovering and exploiting coal. And then, all kinds of fossil fuels have been discovered continuously such as oil and gas. After entering the age of electricity, people started trying to convert various energy sources into electricity. However, traditional fossil fuels have been depleted as humans continue to collect them, and many of them are harmful to the environment after been used. Therefore, human beings began to devote themselves to exploring all kinds of new energy, such as solar energy, wind energy, geothermal energy and nano energy. X-rays are also an emerging energy source. Its energy is 124 eV∼1.24 MeV which rank only second to gamma ray. And depending on its penetrating effect, differential absorption, photosensitive effect and fluorescence effect, has played a great advantage in medicine. At the same time, halogen perovskite has been found that has better stability, and it is very promising to replace α-Se as the next generation of direct X-ray detection materials. In this paper, we designed an X-ray energy detection system based on micro system, which uses perovskite to detect X-ray. And then we designed a signal amplification and rectification circuit which is used to amplify and rectify the signal because the X-ray energy signal is weak and disorderly. Finally, we used the micro system is used to process and respond to the input signal.