High-energy 3D calorimeter for use in gamma-ray astronomy based on position-sensitive virtual Frisch-grid CdZnTe detectors

被引：1

作者：

Moiseev, A. ^{[1
,2
]}

Bolotnikov, A. ^{[3
]}

DeGeronimo, G. ^{[3
]}

Hays, E. ^{[4
]}

James, R. ^{[5
]}

Thompson, D. ^{[4
]}

Vernon, E. ^{[3
]}

机构：

[1] NASA, CRESST, GSFC, Greenbelt, MD 20771 USA

[2] Univ Maryland, Greenbelt, MD 20771 USA

[3] Brookhaven Natl Lab, Upton, NY 11973 USA

[4] NASA, GSFC, Greenbelt, MD 20771 USA

[5] Savannah River Natl Lab, Savannah River, SC USA

来源：

JOURNAL OF INSTRUMENTATION | 2017年 / 12卷

关键词：

Calorimeters; Gamma detectors (scintillators; CZT; HPG; HgI etc); Space instrumentation; Gamma telescopes;

D O I：

10.1088/1748-0221/12/12/C12037

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

We will present a concept for a calorimeter based on a novel approach of 3D position-sensitive virtual Frisch-grid CdZnTe (hereafter CZT) detectors. This calorimeter aims to measure photons with energies from similar to 100 keV to 20-50MeV. The expected energy resolution at 662 keV is better than 1% FWHM, and the photon interaction position-measurement accuracy is better than 1 mm in all 3 dimensions. Each CZT bar is a rectangular prism with typical cross-section from 5 x 5 to 7 x 7mm2 and length of 2-4 cm. The bars are arranged in modules of 4 x 4 bars, and the modules themselves can be assembled into a larger array. The 3D virtual voxel approach solves a long-standing problem with CZT detectors associated with material imperfections that limit the performance and usefulness of relatively thick detectors (i.e., > 1 cm). Also, it allows us to use the standard (unselected) grade crystals, while achieving the energy resolution of the premium detectors and thus substantially reducing the cost of the instrument. Such a calorimeter can be successfully used in space telescopes that use Compton scattering of gamma-rays, such as AMEGO, serving as part of its calorimeter and providing the position and energy measurement for Compton-scattered photons (like a focal plane detector in a Compton camera). Also, it could provide suitable energy resolution to allow for spectroscopic measurements of gamma-ray lines from nuclear decays.

引用

页数：10

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