Avalanche photodiode arrays for a high-angular resolution X-ray and gamma-ray imaging telescopes

2007 ◽  
Vol 580 (2) ◽  
pp. 848-852 ◽  
Author(s):  
M.R. Squillante ◽  
R.A. Myers ◽  
F. Robertson ◽  
R. Farrell ◽  
J.F. Christian ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Angular Resolution ◽  
Avalanche Photodiode ◽  
High Angular Resolution ◽  
X Ray ◽  
Gamma Ray Imaging ◽  
Photodiode Arrays ◽  
Imaging Telescopes

THE AGILE MISSION AND GAMMA-RAY ASTROPHYSICS

2002 ◽  
Vol 17 (12n13) ◽  
pp. 1799-1808 ◽  
Author(s):  
MARCO TAVANI
Keyword(s):  
Energy Range ◽  
Gamma Ray ◽  
Angular Resolution ◽  
Source Monitoring ◽  
Space Mission ◽  
Quick Response ◽  
Scientific Program ◽  
X Ray ◽  
Imaging Capability ◽  
Gamma Ray Imaging

Gamma-ray astrophysics in the energy range between 30 MeV and 30 GeV is in desperate need of arcminute angular resolution and source monitoring capability. The AGILE Mission planned to be operational in 2004-2006 will be the only space mission entirely dedicated to gamma-ray astrophysics above 30 MeV. The main characteristics of AGILE are the simultaneous X-ray and gamma-ray imaging capability (reaching arcminute resolution) and excellent gamma-ray timing (10-100 microseconds). AGILE scientific program will emphasize a quick response to gamma-ray transients and multiwavelength studies of gamma-ray sources.

scholarly journals The Gamma-ray Large Area Space Telescope (GLAST)

2002 ◽  
Vol 187 ◽  
pp. 73-77
Author(s):  
Taro Kotani
Keyword(s):  
International Collaboration ◽  
Gamma Ray ◽  
Angular Resolution ◽  
Effective Area ◽  
Low Earth Orbit ◽  
Gamma Ray Bursts ◽  
Earth Orbit ◽  
Large Area ◽  
X Ray ◽  
Primary Instrument

AbstractGLAST, the next U.S. general gamma-ray astrophysics mission scheduled to be launched into low Earth orbit in April, 2006, for 5–10 years of operation, is described. A product of a NASA/DOE and international collaboration, the Large Area Telescope (LAT) is the primary instrument that covers the < 20 MeV to > 300 GeV band with an effective area > 8000 cm2. The angular resolution ranges from < 3.5° at 100 MeV to < 0.15° at 10 GeV. The GLAST Burst Monitor (GBM) consists of a group of NaI and BGO detectors to extend GLAST’s sensitivity to gamma-ray bursts to the < 10 keV to > 25 MeV band. GLAST’s localizations enables us to identify the X-ray, optical and radio counterparts of thousands of gamma-ray sources and to determine their nature.

scholarly journals Commission No. 9: Instruments and Techniques (Instruments et Techniques)

1988 ◽  
Vol 20 (2) ◽  
pp. 135-149
Author(s):  
C.M. Humphries ◽  
J. Davis
Keyword(s):  
Gamma Ray ◽  
High Angular Resolution ◽  
X Ray ◽  
Stellar Photometry ◽  
Business Meetings ◽  
Array Detectors ◽  
Future Space ◽  
Space Programs ◽  
Resolution Imaging ◽  
Instruments And Techniques

Given here are reports on the scientific and business meetings held in Baltimore involving Commission 9 only. Reports on the following Joint Commission Meetings co-sponsored by Commission 9 (JCM 3 and JCM 6), and on three additional meetings organised jointly with other Commissions, will be found elsewhere in this Volume or in Highlights of Astronomy (Volume 8):-High Angular Resolution Imaging from the Ground (JCM 3)-Stellar Photometry with Array Detectors (JCM 6)-Problems of IR Extinction and Standardization (with Commission 25)-Future Space Programs (with Commission 44)-Gamma-ray, X-ray, Extreme and Far UV, IR and Radio Astronomy from Space (with Commissions 40 and 44)

Development of thin-shell adaptive optics for high angular resolution x-ray telescopes

2008 ◽  
Author(s):  
Charlotte Feldman ◽  
Richard Willingale ◽  
Carolyn Atkins ◽  
Hongchang Wang ◽  
Peter Doel ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Thin Shell ◽  
Angular Resolution ◽  
High Angular Resolution ◽  
X Ray

scholarly journals Next generation astronomical x-ray optics: high angular resolution, light weight, and low production cost

2012 ◽  
Author(s):  
W. W. Zhang ◽  
M. P. Biskach ◽  
P. N. Blake ◽  
K.-W. Chan ◽  
J. A. Gaskin ◽  
...  
Keyword(s):  
Production Cost ◽  
Angular Resolution ◽  
High Angular Resolution ◽  
Light Weight ◽  
Next Generation ◽  
Ray Optics ◽  
X Ray

Development of a Mercuric Iodide Detector Array For In-Vivo X-Ray Imaging

1994 ◽  
Vol 38 ◽  
pp. 615-624
Author(s):  
Bradley E. Patt ◽  
Jan S. Iwanczyk ◽  
Martin P. Tornai ◽  
Craig S. Levin ◽  
Edward J. Hoffman
Keyword(s):  
Gamma Camera ◽  
Gamma Ray ◽  
Active Area ◽  
Detector Array ◽  
Mercuric Iodide ◽  
X Ray ◽  
X Ray Imaging ◽  
Spatial Performance ◽  
Gamma Ray Imaging

Abstract A nineteen element mercuric iodide (HgI2) detector array has been developed in order to investigate the potential of using this technology for in-vivo x-ray and gamma-ray imaging. A prototype cross-grid detector array was constructed with hexagonal pixels of 1.9 mm diameter (active area = 3.28 mm2) and 0.2 mm thick septa. The overall detector active area is roughly 65 mm2. A detector thickness of 1.2 mm was used to achieve about 100% efficiency at 60 keV and 67% efficiency at 140 keV The detector fabrication, geometry and structure were optimized for charge collection and to minimize crosstalk between elements. A section of a standard high resolution cast-lead gamma-camera collimator was incorporated into the detector to provide collimation matching the discrete pixel geometry. Measurements of spectral and spatial performance of the array were made using 241-Am and 99m-Tc sources. These measurements were compared with similar measurements made using an optimized single HgI2 x-ray detector with active area of about 3 mm2 and thickness of 500 μm.

Fused silica segments: a possible solution for x-ray telescopes with very high angular resolution like Lynx/XRS

2017 ◽  
Author(s):  
Bianca Salmaso ◽  
Stefano Basso ◽  
Marta M. Civitani ◽  
Mauro Ghigo ◽  
Joanna Holyszko ◽  
...  
Keyword(s):  
Angular Resolution ◽  
Fused Silica ◽  
High Angular Resolution ◽  
X Ray ◽  
Very High

Harecxs Measurements of Elemental Disordering

2001 ◽  
Vol 7 (S2) ◽  
pp. 354-355
Author(s):  
Nestor J. Zaluzec ◽  
Katherine L. Smith
Keyword(s):  
Angular Resolution ◽  
Alpha Decay ◽  
High Angular Resolution ◽  
Crystalline Materials ◽  
X Ray ◽  
Geologic Time ◽  
The Past ◽  
Selected Area Electron Diffraction ◽  
Resolution Electron ◽  
High Level

It has been long known that orientation effects in crystalline materials can influence characteristic x-ray emission and microanalysis1-7. High Angular Resolution Electron Channeling X-ray Spectroscopy (HARECXS)6-7. a variation of ALCHEMI4-5, has been used at ANL for the last few years to investigate the effects of channeling on quantitative XEDS analysis of materials. More recently we have also been using HARECXS to carefully measure elemental disordering in a number of systems and have found that it can be used very successfully to elucidate the various stages of disorder.Perovskite (nominally CaTiO3) is a host phase for actinides in various wasteforms for the immobilization of high level radioactive nuclear waste. Over geologic time, alpha decay damage of the actinides in perovskite will cause displacive effects that influence the dimensional and chemical stability of the wasteform. in the past, the progression of damage has been studied by monitoring changes in selected area electron diffraction (SAED) patterns with increasing dose (e.g. 11).

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