Simulation study of a highly efficient, high resolution X-ry sensor based on self-organizing aluminum oxide

State of the art X-ray imaging sensors comprise a trade-off between the achievable efficiency and the spatial resolution. To overcome such limitations, the use of structured and scintillator filled aluminum oxide (AlOx) matrices has been investigated. We used Monte-Carlo (MC) X-ray simulations to determine the X-ray imaging quality of these AlOx matrices. Important factors which influence the behavior of the matrices are: filling factor (surface ratio between channels and 'closed' AlOx), channel diameter, aspect ratio, filling material etc. Therefore we modeled the porous AlOx matrix in several different ways with the MC X-ray simulation tool ROSI [1] and evaluated its properties to investigate the achievable performance at different X-ray spectra, with different filling materials (i.e. scintillators) and varying channel height and pixel readout. In this paper we focus on the quantum efficiency, the spatial resolution and image homogeneity

Методы измерения фазового сдвига с промежуточным преобразованием напряжение-частота

В статті розглянуті методи вимірювання фазового зсуву з проміжним перетворенням напруга-частота. Проаналізовано переваги й недоліки методів. Проведено оцінку похибки, обумовленої неточністю формування часових інтервалів.In article methods of measurement of phase shift with preliminary transformation a voltage-frequency are considered. Their merits and demerits are analyzed. The estimation of the error caused by discrepancy of formation of time intervals is made

Dark Matter Searches with the ANTARES Neutrino Telescope

[EN] The MOSCAB experiment (Materia OSCura A Bolle) uses the Geyser technique for dark matter search. The results of the first 0.5 kg mass prototype detector using superheated C3F8 liquid were very encouraging, achieving a 5 keV nuclear recoil threshold with high insensitivity to gamma radiation. Additionally, the technique seems to be easily scalable to higher masses for both in terms of complexity and costs, resulting in a very competitive technique for direct dark matter search, especially for the spin dependent case. Here, we report as well in the construction and commissioning of the big detector of 40 kg at the Milano-Bicocca University. The detector, the calibration tests and the evaluation of the background will be presented. Once demonstrated the functionality of the detector, it will be operated at the Gran Sasso National Laboratory in 2015.We acknowledge the financial support of the Spanish Ministerio de Ciencia e Innovación (MICINN) and Ministerio de Economía y Competitividad (MINECO), Grants FPA2012-37528-C02-02, and Consolider MultiDark CSD2009-00064, and of the Generalitat Valenciana, Grants ACOMP/2014/153 and PrometeoII/2014/079.Ardid Ramírez, M. (2016). Dark Matter Searches with the ANTARES Neutrino Telescope. Nuclear and Particle Physics Proceedings. 273:378-382. https://doi.org/10.1016/j.nuclphysbps.2015.09.054S37838227

Roentgentarget und Verfahren zur Erzeugung von Roentgenstrahlung

DE 102009007871 A1 UPAB: 20100903 NOVELTY - The target (20) has a target material (2) and an electrically-conductive hollow substrate (1) that are made of foamed material. The substrate is made of metal or ceramic. The substrate has a fluid-sealed outer surface that comprises a cooling medium supply opening and cooling medium removal opening. The substrate forms a rotationally symmetric body with a rotational axis. The target material is in the form of a circular target strip and provided at an outer surface of the rotationally symmetric body. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following: (1) an X-ray tube comprising an electron gun (2) a method for producing an X-ray. USE - X-ray target i.e. reflection X-ray target, for use in an X-ray tube (claimed) in a Roentgen system. Uses include but are not limited to non destructive testing applications of material, in medical field, in luggage inspection field and for analysis purpose. ADVANTAGE - The substrate made of foamed material serves as a foamed cooling body, thus enabling dissipation of remaining heat arising during production of X-ray in a better manner

Röntgentarget und ein Verfahren zur Erzeugung von Röntgenstrahlen

An X-ray target (110) for producing X-radiation (120) by way of an electron beam (130) striking the X-ray target (110) has a cross-sectional area (A) perpendicular to the electron beam (130) and a longitudinal extent (L) parallel to the electron beam (130), wherein the electron beam (130) can be directed onto the cross-sectional area (A) and A 2

Recent progress in 3-D imaging of sea freight containers

The inspection of very large objects like sea freight containers with X-ray Computed Tomography (CT) is an emerging technology. A complete 3-D CT scan of a see-freight container takes several hours. Of course, this is too slow to apply it to a large number of containers. However, the benefits of a 3-D CT for sealed freight are obvious: detection of potential threats or illicit cargo without being confronted with legal complications or high time consumption and risks for the security personnel during a manual inspection. Recently distinct progress was made in the field of reconstruction of projections with only a relatively low number of angular positions. Instead of today's 500 to 1000 rotational steps, as needed for conventional CT reconstruction techniques, this new class of algorithms provides the potential to reduce the number of projection angles approximately by a factor of 10. The main drawback of these advanced iterative methods is the high consumption for numerical processing. But as computational power is getting steadily cheaper, there will be practical applications of these complex algorithms in a foreseeable future. In this paper, we discuss the properties of iterative image reconstruction algorithms and show results of their application to CT of extremely large objects scanning a sea-freight container. A specific test specimen is used to quantitatively evaluate the image quality in terms of spatial and contrast resolution and depending on different number of projections

Monte Carlo X-ray Scattering Studies in the MeV Regime

A study is shown which is performed to enhance an existing deterministic X-ray simulation method for nondestructive testing applications by including the effect of pair production and annihilation. Therefore, a Monte Carlo simulation tool was used to perform parameter studies. Several materials from polyvinyl chloride to lead and of different lengths were simulated with 109 monoenergetic photons per simulation run. These were used to quantify and evaluate the radial distribution of scattered photons for each length, material and energy as a function of the scattering angle. The results indicate that the radiation originating from the electron-positronannihilation and thus from the pair generation is one major contributor to the total deposited energy only for certain angular ranges whereas for other angles Compton is by far the leading scattering effect. Furthermore, the results indicate that the electron-positron-annihilation radiation is negligible for most imaging tasks and thus unimportant for deterministic scattering simulations