Temat: X-ray - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: X-ray radiation channeling in micro-channel plates : spectroscopy with a synchrotron radiation beam
Autorzy:: Marcelli, A.
Mazuritskiy, M. I.
Dziedzic-Kocurek, Katarzyna
Dabagov, S. B.
Lerer, A. M.
Opis:: We present here the angular distribution of the radiation propagated inside MultiChannel Plates with micro-channels of $\sim 3 \mu m$ diameter. The spectra collected at the exit of the channels present a complex distribution with contributions that can be assigned to the fluorescence radiation, originated from the excitation of the micro-channel walls. For radiation above the absorption edge, when the monochromatic energy in the region of the Si L-edge hits the micro-channel walls with a grazing angle $\theta \geqslant 5^{\circ}$, or at the O K-edge when $\theta \geqslant 2^{\circ}$ a fluorescence radiation is detected. Additional information associated to the fine structures of the XANES spectra detected at the exit of MCPs are also presented and discussed.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 2.

Tytuł:: X-ray spectroscopy of fluorescence radiation channeling in $\mu$ -capillary holed glass plates
Autorzy:: Dziedzic-Kocurek, Katarzyna
Marcelli, A.
Mazuritskiy, M. I.
Dabagov, S. B.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 3.

Tytuł:: Transmission diffractive patterns of large microchannel plates at soft X-ray energies
Autorzy:: Marcelli, A.
Mazuritskiy, M. I.
Dziedzic-Kocurek, Katarzyna
Turchini, S.
Sacchi, M.
Coreno, M.
Sokolov, A.
Dabagov, S. B.
Lerer, A. M.
D'Elia, A.
Opis:: In this contribution we compare experimental and theoretical diffractive patterns of Micro Channel Plates (MCPs) in transmission. We evaluate the transmission efficiency of different optical devices at different energies of the primary X-ray radiation in the normal incidence geometry. Data were collected performing angular scans of both the MCP device and of the detector in the range of a few degrees. We analyzed MCPs of 33mm and 20mm diameter and ∼300µm thickness, having circular micro-channels of 3.4µm directed normal to the MCP surface. Quite symmetric patterns of increasing complexity from high to low photon energy have been collected. Their shape and intensity are in reasonable agreement with preliminary simulations.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 4.

Tytuł:: Excitation and propagation of X-ray fluorescence through thin devices with hollowed ordered structures : comparison of experimental and theoretical spectra
Autorzy:: Marcelli, A.
Mazuritskiy, M. I.
Dziedzic-Kocurek, Katarzyna
Dabagov, S. B.
Lerer, A. M.
Opis:: The lack of models describing the propagation of X-rays in waveguides and the interference mechanism between incident and reflected radiation waves hamper the understanding and the control of wave propagation phenomena occurring in many real systems. Here, experimental spectra collected at the exit of microchannel plates (MCPs) under the total X-ray reflection condition are presented. The results are discussed in the framework of a theoretical model in which the wave propagation is enhanced by the presence of a transition layer at the surface. The angular distributions of the propagating radiation at the exit of these MCPs with microchannels of ~3 µm diameter will also be presented and discussed. These spectra show contributions associated with the reflection of the primary monochromatic beam and with the fluorescence radiation originating from the excitation of atoms composing the surface of the microchannel. The soft X-ray fluorescence spectra collected at the exit of microcapillaries were analyzed in the framework of a wave approximation while diffraction contributions observed at the exit of these hollow X-ray waveguides have been calculated using the Fraunhofer diffraction model for waves in the far-field domain. Data collected at the Si L-edge show that in glassy MCPs the fluorescence radiation can be detected only when the energy of the primary monochromatic radiation is above the absorption edge for grazing angles higher than half of the critical angle of the total reflection phenomenon. Experimental data and simulations of the propagating radiation represent a clear experimental confirmation of the channeling phenomenon of the excited fluorescence radiation inside a medium and point out that a high transmission can be obtained in waveguide optics for parameters relevant to X-ray imaging.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 5.

Tytuł:: Laboratory-based recording of holographic fine structure in X-ray absorption anisotropy using polycapillary optics
Autorzy:: Dąbrowski, K. M.
Korecki, Paweł
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 6.

Tytuł:: Performance of a laboratory von Hámos type x-ray spectrometer in x-ray absorption spectroscopy study on 3d group metals
Autorzy:: Szlachetko, Jakub
Błachucki, Wojciech
Sobstel, Michał
Fanselow, Rafał
Opis:: With the recent progress regarding the development of x-ray instrumentation, compact x-ray spectrometers are becoming more and more popular as they allow x-ray absorption spectroscopy (XAS) and x-ray emission spectroscopy (XES) studies at the research institutes laboratories. Such setups provide a cost-effective tool for routine sample characterization with unlimited access and are of great utility in feasibility studies preceding the experiments at synchrotrons and x-ray free-electron lasers (XFELs). Herein, we present the operation and capabilities of the von Hamos type x-ray spectrometer in x-ray absorption spectra measurement for various 3d metal elements. Results allowed us to establish the photon counting performance of the setup, demonstrating a possible range of applications of the in-house x-ray spectroscopy apparatus.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 7.

Tytuł:: Review of X-ray detection systems
Autorzy:: Urbański, Paweł
Grzebyk, Tomasz
Tematy:: X-ray detection
X-ray radiation
dosimetry
luminescence; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Powiązania:: https://bibliotekanauki.pl/articles/27315700.pdf Link otwiera się w nowym oknie
Opis:: The article presents an overview and a classification of X-ray detection methods. The main motivation for its preparation was the need to select a suitable and useful method for detecting signals from a currently developed miniature micro-electro-mechanical system (MEMS) X-ray source. The described methods were divided into passive and active ones, among which can be distinguished: chemical, luminescent, thermo-luminescent, gas ionization, semiconductor, and calorimetric methods. The advantages and drawbacks of each method were underlined, as well as their usefulness for the characterisation of the miniature MEMS X-ray source.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 8.

Autorzy:: Kumar, Pawan
Chandrashekhara, Sheragaru Hanumanthappa
Triveni, Gowramma Sannanaik
Singh, Anuradha
Opis:: The sternum is an uncommon site for neoplastic involvement and metastases are far commoner than primary neoplasms. Of the primary tumours, malignant lesions are more frequent than the benign lesions. Early diagnosis and treatment is prudent in such neoplasms not only to halt disease progression but also to prevent circulatory compromise resulting from the mass effect on the mediastinum. Sound knowledge of neoplasms affecting the sternum and their imaging appearance is essential to arrive at an early diagnosis and also to obviate biopsy in cases with classical imaging findings. Neoplastic involvement of the sternum is extremely unusual and should be considered malignant unless proven otherwise. Imaging may help in arriving at the diagnosis of these lesions, together with other factors such as patient's age, type of lesion (lytic/sclerotic or mixed), matrix mineralization, multiplicity and involvement of other sites.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 9.

Tytuł:: Wideband spectral emission measurements from laser-produced plasma EUV/SXR source based on a double gas puff target
Autorzy:: Arikkatt, Antony Jose
Wachulak, Przemysław
Fiedorowicz, Henryk
Bartnik, Andrzej
Czwartos, Joanna
Tematy:: Plasma Spectroscopy
X-ray coherence tomography
soft X-ray; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/1849155.pdf Link otwiera się w nowym oknie
Opis:: We present spectral emission characteristics from laser-plasma EUV/SXR sources produced by irradiation of < 1 J energy laser pulse on eleven different double stream gas puff targets, with most intense electronic transitions identified in the spectral range from 1 nm to 70 nm wavelength which corresponds to photon energy from 18 eV to 1240 eV. The spectra were obtained using grazing incidence and transmission spectrographs from laser-produced plasma emission, formed by the interaction of a laser beam with a double stream gas puff target. Laser pulses with a duration of 4 ns and energy of 650 mJ were used for the experiment. We present the results obtained from three different spectrometers in the wavelength ranges of SXR (1-5.5 nm), SXR/EUV (4-15.5 nm), and EUV (10-70 nm). In this paper, detailed information about the source, gas targets under investigation, the experimental setup, spectral measurements and the results are presented and discussed. Such data may be useful for the identification of adequate spectral emissions from gasses in the EUV and SXR wavelength ranges dedicated to various experiments (i.e. broadband emission for the X-ray coherence tomography XCT) or may be used for verification of magnetohydrodynamic plasma codes.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Efficiency analysis and promising applications of silicon drift detectors
Autorzy:: Khreptak, Aleksander
Skurzok, Magdalena
Opis:: Silicon Drift Detectors (SDDs) stand as a groundbreaking technology with a diverse range of applications, particularly in the fields of physics and medical imaging. This paper provides an analysis of the performance of SDDs as detectors for X-ray radiation measurement, shedding light on their exceptional capabilities and potential in medical imaging. Compared to conventional detectors, SDDs have several notable advantages. Their high efficiency in capturing X-rays allows them to provide outstanding sensitivity and accuracy in detecting even low-energy X-rays. In addition, SDDs exhibit significantly low electronics noise levels, contributing to better signal-to-noise ratio and better data quality. Furthermore, their high resolution enables exact spatial localization of radiation sources, which is essential for accurate diagnosis. This research is devoted to the evaluation of efficiency and potential applications of SDDs in X-ray spectroscopy, with particular emphasis on their application in medical imaging. We focus on evaluating the performance characteristics of SDDs, such as linearity, stability, and sensitivity in detecting X-rays. The aim is to highlight the suitability of SDDs for a wide range of applications.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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