Scintillation of Un-doped ZnO Single Crystals

MRS Advances ◽  
2016 ◽  
Vol 1 (2) ◽  
pp. 121-126 ◽  
Author(s):  
A. M. Colosimo ◽  
Jianfeng Ji ◽  
P. S. Stepanov ◽  
L. A. Boatner ◽  
F. A. Selim
Keyword(s):  
Single Crystals ◽  
Photo Luminescence ◽  
Radiation Detectors ◽  
Scientific Instruments ◽  
Good Energy Resolution ◽  
X Ray ◽  
Good Energy ◽  
Anode Signal ◽  
Doped Zno ◽  
Insight Into

ABSTRACTScintillation properties are often studied by photo-luminescence (PL) and scintillation measurements. In this work, we combine X-ray-induced luminescence (XRIL) spectroscopy [Review of Scientific Instruments 83, 103112 (2012)] with PL and standard scintillation measurements to give insight into the scintillation properties of un-doped ZnO single crystals. XRIL revealed that ZnO luminescence proportionally increases with X-ray power and exhibits excellent linearity - indicating the possibility of developing radiation detectors with good energy resolution. By coupling ZnO crystals to fast photomultiplier tubes and monitoring the anode signal, rise times as fast as 0.9 ns were measured.

A small rugged imaging X-ray spectrometer: A lixiscope with good energy resolution

1980 ◽  
Vol 172 (3) ◽  
pp. 471-477 ◽  
Author(s):  
Lo I Yin ◽  
Jacob I. Trombka ◽  
Stephen M. Seltzer
Keyword(s):  
Energy Resolution ◽  
Good Energy Resolution ◽  
X Ray ◽  
Good Energy

scholarly journals ROSAT Observations of Active Galactic Nuclei

1994 ◽  
Vol 159 ◽  
pp. 53-62 ◽  
Author(s):  
W. Brinkmann
Keyword(s):  
Active Galactic Nuclei ◽  
Spectral Properties ◽  
Galactic Nuclei ◽  
High Sensitivity ◽  
Good Energy Resolution ◽  
Ongoing Research ◽  
X Ray ◽  
Sky Survey ◽  
Good Energy ◽  
First Time

The large number of Active Galactive Nuclei detected for the first time through their X-ray emission in the ROSAT All Sky Survey as well as the first measurements of the X-ray emission of many previously known AGN provide a new unprecedented large basis for the statistical and morphological exploration of these objects.The soft energy range of the X-Ray Telescope, the good energy resolution of the PSPC detector, and the high sensitivity of the instrument further allows an investigation of the spectral properties of sources in this energetically important energy band.A short overview is given of the actual ongoing research concentrating on the study of the soft X-ray class properties of the various types of AGN.

Preparation and Characterization of Ag and Co Doped ZnO Nano Particles

2012 ◽  
Vol 584 ◽  
pp. 248-252
Author(s):  
B. Sankara Reddy ◽  
S. Venkatramana Reddy ◽  
R.P. Vijaya Lakshmi ◽  
N. Koteeswara Reddy
Keyword(s):  
Blue Emission ◽  
Photo Luminescence ◽  
Hexagonal Structure ◽  
Nano Particles ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Doped Zno ◽  
Co Precipitation ◽  
Co Doped

Pure ZnO and Ag, Co doped ZnO nano particles [Zn1-xAgxCoyO, where x = 0.00 and 0.05, y = 0.05] were synthesized by chemical co precipitation method without use of surfactant. All the prepared samples calcinated in 1 hour at 500oC, after that the morphology of the samples were evaluated by Scanning Electron Microscope (SEM). The X- ray diffraction (XRD) results indicated that the synthesized co-doped ZnO nano crystals had the pure hexagonal structure without any significant change in the structure affected by Ag and Co substitution. Dopant elements Ag and Co are present in the ZnO host material and conformed by Energy Dispersive Analysis of X-ray Spectra (EDAX). The incorporation of Ag+ in the place of Zn2+ has made a considerable decrease in the size of nano crystals as compared to pure ZnO nano particles (It is to be noted that Co should be kept constant at 5 mol %). Blue emission was observed by Photo Luminescence (PL) Spectra.

Controlling the Properties of Bulk Metal Oxides at a Molecular Level: Alkoxides Vs Carboxylates‐Alkoxides Routes

1994 ◽  
Vol 346 ◽  
Author(s):  
Liliane G. Hubert‐pfalzgraf ◽  
Stephane Daniele ◽  
Souad Boulmaaz ◽  
Renee Papiernik
Keyword(s):  
Light Scattering ◽  
Metal Oxides ◽  
Single Crystals ◽  
Molecular Level ◽  
Bulk Metal ◽  
X Ray ◽  
Material Data ◽  
Metal Derivatives ◽  
Ft Ir ◽  
Insight Into

ABSTRACTThe reactions between alkoxides and/or alkoxides and anhydrous acetates have been investigated for access to advanced multicomponent niobates or titanates and with the aim to get insight into relationships between the nature of the initial precursors ‐ single or mixed‐metal derivatives, ligands (OAc or OR, R = Et, iPr),…‐ and the properties of the final material. Data are based on a variety of techniques: FT‐IR, multinuclear NMR (1H, 13C, 207Pb, 113Cd), X‐ray investigations on single crystals. Powders have been analyzed by TGA, SEM‐EDX, light scattering and XRD.

scholarly journals Energy Response of Silicon Drift Detectors for Kaonic Atom Precision Measurements

2019 ◽  
Vol 4 (1) ◽  
pp. 31 ◽  
Author(s):  
Marco Miliucci ◽  
Mihail Iliescu ◽  
Aidin Amirkhani ◽  
Massimiliano Bazzi ◽  
Catalina Curceanu ◽  
...  
Keyword(s):  
Energy Resolution ◽  
Precision Measurements ◽  
Energy Response ◽  
Good Energy Resolution ◽  
Large Area ◽  
Kaonic Atom ◽  
X Ray ◽  
Good Energy ◽  
Silicon Drift Detectors ◽  
Stable Linear

Novel, large-area silicon drift detectors (SDDs) have been developed to perform precision measurements of kaonic atom X-ray spectroscopy, for the study the K ¯ N strong interaction in the low-energy regime. These devices have special geometries, field configurations and read-out electronics, resulting in excellent performances in terms of linearity, stability and energy resolution. In this work the SDDs energy response in the energy region between 4000 eV and 12,000 eV is reported, revealing a stable linear response within 1 eV and good energy resolution.

X-Ray Fluorescence Spectrometry With Gas Proportional Scintillation Counters

1987 ◽  
Vol 31 ◽  
pp. 445-448
Author(s):  
C.A.N. Conde ◽  
J.M.F. dos Santos ◽  
Teresa H.V.T. Dias ◽  
A.J.A. de Campos ◽  
Benilde F.O. Costa
Keyword(s):  
Direct Contact ◽  
Fluorescence Spectra ◽  
Scintillation Counter ◽  
Fluorescence Analysis ◽  
Uniform Field ◽  
Good Energy Resolution ◽  
Quartz Window ◽  
X Ray ◽  
Large Window ◽  
Good Energy

AbstractAn uniform field gas proportional scintillation counter is described for X-ray fluorescence analysis applications requiring large window areas and good energy resolution at rcom temperature. This counter uses continuously purified xenon as the filling gas and a 1 inch diameter window. A quartz window Hamamatsu R562 photomultiplier is used with its window in direct contact with the gas. Measured energy resolutions were in the 12 to 13% range for the 5.9keV X–ray line. X–ray fluorescence spectra for a few samples are presented with excitation by ImC 55Fe and 244cm sources. Measured physical excitation-detection efficiencies are compared with calculated values.

scholarly journals Silicon Drift Detectors’ Spectroscopic Response during the SIDDHARTA-2 Kaonic Helium Run at the DAΦNE Collider

2021 ◽  
Vol 6 (4) ◽  
pp. 47
Author(s):  
Marco Miliucci ◽  
Massimiliano Bazzi ◽  
Damir Bosnar ◽  
Mario Bragadireanu ◽  
Marco Carminati ◽  
...  
Keyword(s):  
High Precision ◽  
Field Configuration ◽  
Exotic Atoms ◽  
Good Energy Resolution ◽  
Large Area ◽  
Kaonic Atom ◽  
X Ray ◽  
Kaonic Deuterium ◽  
Good Energy ◽  
Silicon Drift Detectors

A large-area silicon drift detectors (SDDs) system has been developed by the SIDDHARTA-2 collaboration for high precision light kaonic atom X-ray spectroscopy at the DAΦNE collider of Istituto Nazionale di Fisica Nucleare—Laboratori Nazionali di Frascati. The SDDs’ geometry and electric field configuration, combined with their read-out electronics, make these devices suitable for performing high precision light kaonic atom spectroscopy measurements in the background of the DAΦNE collider. This work presents the spectroscopic response of the SDDs system during the first exotic atoms run of SIDDHARTA-2 with kaonic helium, a preliminary to the kaonic deuterium data taking campaign. The SIDDHARTA-2 spectroscopic system has good energy resolution and a 2 μs timing window which rejects the asynchronous events, scaling the background by a factor of 10−5. The results obtained for the first exotic atoms run of SIDDHARTA-2 prove this system to be ready to perform the challenging kaonic deuterium measurement.

Über neuere Polymetallate / Polyanions of Novel Structural Types

1973 ◽  
Vol 28 (7-8) ◽  
pp. 389-404 ◽  
Author(s):  
Joachim Fuchs
Keyword(s):  
Single Crystals ◽  
Vibrational Spectroscopy ◽  
Metal Salt ◽  
Organic Cations ◽  
Salt Solutions ◽  
X Ray ◽  
Structural Types ◽  
Insight Into ◽  
Complicated Mechanism

By the application of newer preparative methods and specific organic cations single crystals of polymetallates were obtained of till now unknown structural types. These are salts with polyanions W6O192-, W10O324-, [HW12O38(OH)2]5-, Mo6O192- and HV4O123-, furthermore para-tungstates A and B, as well as the compounds [N(CH)3)4]2 Μο8Ο25·5Η2Ο and [N(CH3)4]2Mo10 O31 · 7H2O. The structures of the anions W6O192- and W10O324- were elucidated by X-Ray analyses; the structure of the Μο6Ο192- was derived by vibrational spectroscopy. The knowledge of newer polyanion structures increasingly enables us to gain an insight into the complicated mechanism of oxyhydrate formation by acidification of metal salt solutions.

Zone-axis ALCHEMI for the rapid assessment of site occupancies in garnets

1986 ◽  
Vol 44 ◽  
pp. 706-707
Author(s):  
M.T. Otten ◽  
P.R. Buseck
Keyword(s):  
Single Crystals ◽  
Rapid Assessment ◽  
Site Occupancy ◽  
Zone Axis ◽  
Synthetic Compounds ◽  
X Ray ◽  
Large Group ◽  
Crystallographic Planes

ALCHEMI (Atom Location by CHannelling-Enhanced Microanalysis) is a TEM technique for determining site occupancies in single crystals. The method uses the channelling of incident electrons along specific crystallographic planes. This channelling results in enhanced x-ray emission from the atoms on those planes, thereby providing the required site-occupancy information. ALCHEMI has been applied with success to spinel, olivine and feldspar. For the garnets, which form a large group of important minerals and synthetic compounds, the channelling effect is weaker, and significant results are more difficult to obtain. It was found, however, that the channelling effect is pronounced for low-index zone-axis orientations, yielding a method for assessing site occupancies that is rapid and easy to perform.

Quantitative Analysis Of X-Ray Images From Geological Materials

1990 ◽  
Vol 48 (2) ◽  
pp. 244-245
Author(s):  
J. M. Paque ◽  
R. Browning ◽  
P. L. King ◽  
P. Pianetta
Keyword(s):  
Quantitative Analysis ◽  
Bulk Composition ◽  
Principal Component ◽  
Analytical Description ◽  
Bulk Sample ◽  
Geological Samples ◽  
X Ray ◽  
Software And Hardware ◽  
And Storage ◽  
Insight Into

Geological samples typically contain many minerals (phases) with multiple element compositions. A complete analytical description should give the number of phases present, the volume occupied by each phase in the bulk sample, the average and range of composition of each phase, and the bulk composition of the sample. A practical approach to providing such a complete description is from quantitative analysis of multi-elemental x-ray images.With the advances in recent years in the speed and storage capabilities of laboratory computers, large quantities of data can be efficiently manipulated. Commercial software and hardware presently available allow simultaneous collection of multiple x-ray images from a sample (up to 16 for the Kevex Delta system). Thus, high resolution x-ray images of the majority of the detectable elements in a sample can be collected. The use of statistical techniques, including principal component analysis (PCA), can provide insight into mineral phase composition and the distribution of minerals within a sample.

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