Characterization of amorphous selenium alloy detectors for x-rays and high energy nuclear radiation detection

2013 ◽  
Author(s):  
Krishna C. Mandal ◽  
Abhinav Mehta ◽  
Sandeep K. Chaudhuri ◽  
Yunlong Cui ◽  
Michael Groza ◽  
...  
Keyword(s):  
Radiation Detection ◽  
High Energy ◽  
Amorphous Selenium ◽  
Nuclear Radiation ◽  
X Rays

scholarly journals Introducing the HD+B model for pulsar wind nebulae: a hybrid hydrodynamics/radiative approach

2020 ◽  
Vol 494 (3) ◽  
pp. 4357-4370
Author(s):  
B Olmi ◽  
D F Torres
Keyword(s):  
Gamma Ray ◽  
High Energy ◽  
Theoretical Modelling ◽  
X Rays ◽  
Pulsar Wind Nebulae ◽  
New Approach ◽  
Energy Gamma ◽  
Radiative Model ◽  
Pulsar Wind

ABSTRACT Identification and characterization of a rapidly increasing number of pulsar wind nebulae is, and will continue to be, a challenge of high-energy gamma-ray astrophysics. Given that such systems constitute -by far- the most numerous expected population in the TeV regime, such characterization is important not only to learn about the sources per se from an individual and population perspective, but also to be able to connect them with observations at other frequencies, especially in radio and X-rays. Also, we need to remove the emission from nebulae in highly confused regions of the sky for revealing other underlying emitters. In this paper, we present a new approach for theoretical modelling of pulsar wind nebulae: a hybrid hydrodynamic-radiative model able to reproduce morphological features and spectra of the sources, with relatively limited numerical cost.

Characterization of a long-focal-length polycapillary optic for high-energy x-rays

2000 ◽  
Author(s):  
Padiyar Cari ◽  
Suparmi ◽  
Sushil D. Padiyar ◽  
Walter M. Gibson ◽  
Carolyn A. MacDonald ◽  
...  
Keyword(s):  
Focal Length ◽  
High Energy ◽  
X Rays

Radiation detection materials for quality assurance and dose distribution assessment of small fields of high-energy X-rays

2020 ◽  
Vol 15 (04) ◽  
pp. P04001-P04001
Author(s):  
Sung Jin Noh ◽  
HyoJin Kim ◽  
Hyun Kim ◽  
Jeung kee Kim ◽  
Chi-Woong Mun ◽  
...  
Keyword(s):  
Quality Assurance ◽  
Dose Distribution ◽  
Radiation Detection ◽  
High Energy ◽  
X Rays ◽  
Small Fields

Characterization of Cellulosic Biomass Loaded with Iron and Arsenic Using High Energy X-Rays

2007 ◽  
Vol 20-21 ◽  
pp. 643-646 ◽  
Author(s):  
G. Cordeiro Silva ◽  
Regina Pinto de Carvalho ◽  
M. Sylvia S. Dantas ◽  
Virgínia S.T. Ciminelli
Keyword(s):  
Fine Structure ◽  
Arsenic Species ◽  
High Energy ◽  
Cellulosic Biomass ◽  
X Rays ◽  
Iron Ions ◽  
X Ray ◽  
X Ray Absorption ◽  
Exafs Spectra

The biosorption of arsenic species by dried lettuce leaves (L.sativa) was investigated. Arsenic sorption, that is not effective on in natura biomass, was enhanced when the biomass was previously loaded with Fe(III). Analysis of X-ray Absorption Near-Edge Spectroscopy (XANES) spectra showed that iron was incorporated as Fe(III) and arsenic as As(V), regardless the contact with the lowest or highest valence species of these elements. The features of Extended X-ray Absorption Fine-Structure Spectroscopy (EXAFS) spectra suggest that the nearest neighboring atoms of iron ions are the same in all the samples, even in the As-Fe loaded ones. These results indicate the arsenic oxyanions as the sorbed species on the iron-loaded biomass.

In Situ Observation of Oxygen Precipitation in Silicon with High Energy X-Rays

2009 ◽  
Vol 156-158 ◽  
pp. 437-441 ◽  
Author(s):  
Hannes Grillenberger ◽  
Andreas Magerl
Keyword(s):  
High Energy ◽  
Ex Situ ◽  
X Rays ◽  
X Ray Diffraction ◽  
Oxygen Precipitation ◽  
Float Zone ◽  
Diffraction Mode ◽  
Oxygen Precipitates

Oxygen precipitation in silicon has been studied in-situ by high energy X-ray diffraction. A gain of diffracted intensity is expected if an ideal crystal is distorted by growing precipitates as the diffraction mode changes from a dynamical to a more kinematical one. Irreversible changes in the intensity of a 220 and a 400 Bragg peak are detected for Czochralski grown samples only, but not in a float zone grown reference crystal. Thus, these changes are attributed to oxygen precipitation, which is confirmed by a subsequent classical ex-situ characterization. Further, the changes of the intensities of the two measured Bragg peaks are compared to each other to get the level of change in the diffraction mode from a dynamical to a kinematical one. The detection limit of the specific setup is estimated via a simulation of the defect inventory to correspond to a precipitate diameter of 50nm with the density of 6.9•109 1/cm3. The diffraction experiments are done with polychromatic and divergent X-rays generated by a laboratory source, albeit with high energy. This results in a simple and accessible setup for the characterization of oxygen precipitates.

Local Orientation Measurements in 3D

2005 ◽  
Vol 105 ◽  
pp. 49-54 ◽  
Author(s):  
Dorte Juul Jensen
Keyword(s):  
Tensile Deformation ◽  
High Energy ◽  
X Rays ◽  
X Ray Diffraction ◽  
3 Dimensional ◽  
Grain Structures ◽  
Individual Grains ◽  
Kinetics Of

The 3 Dimensional X-Ray Diffraction (3DXRD) method is presented and its potentials illustrated by examples. The 3DXRD method is based on diffraction of high energy X-rays and allows fast and nondestructive 3D characterization of the local distribution of crystallographic orientations in the bulk. The spatial resolution is about 1x5x5 µm but diffraction from microstructural elements as small as 100 nm may be monitored within suitable samples. As examples of the use of the 3DXRD method, it is chosen to present results for complete 3D characterization of grain structures, in-situ “filming” of the growth of one interior grain during recrystallization, recrystallization kinetics of individual grains and crystallographic rotations of individual grains during tensile deformation.

Characterization of NB microstrip sensors for nuclear radiation detection

1993 ◽  
Vol 1 (7-9) ◽  
pp. 1373-1377
Author(s):  
S. Maggi ◽  
E. Menichetti ◽  
G. Rinaudo ◽  
M. Vanolo
Keyword(s):  
Radiation Detection ◽  
Nuclear Radiation

scholarly journals Characterization of plastic scintillator tiles equipped with SiPMs for the High Energy cosmic-Radiation Detection (HERD) experiment

2019 ◽  
Author(s):  
Fabio Gargano ◽  
A. De Benedittis ◽  
F. Palma ◽  
P. delaTorre Luque ◽  
M. Di Santo ◽  
...  
Keyword(s):  
Cosmic Radiation ◽  
Plastic Scintillator ◽  
Radiation Detection ◽  
High Energy
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