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

Journal Article · · Journal of Instrumentation
 [1];  [2];  [2];  [3];  [4];  [3];  [2]
  1. CRESST/NASA/GSFC and Univ. of Maryland, College Park, Greenbelt, MD (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. NASA/GSFC, Greenbelt, MD (United States)
  4. Savannah River National Lab., Savannah River, SC (United States)
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Here, 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 ~100 keV to 20–50 MeV . 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 5×5 to 7×7 mm2 and length of 2–4 cm. The bars are arranged in modules of 4×4 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 γ-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 γ-ray lines from nuclear decays.
Research Organization:
Savannah River Site (SRS), Aiken, SC (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC09-08SR22470
OSTI ID:
1439432
Alternate ID(s):
OSTI ID: 22895783
Report Number(s):
SRNL-STI--2017-00748
Journal Information:
Journal of Instrumentation, Journal Name: Journal of Instrumentation Journal Issue: 12 Vol. 12; ISSN 1748-0221
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

Figures / Tables (5)

Figure 1(p. 3)figure Figure 1
Figure 2(p. 4)figure Figure 2
Figure 3(p. 4)figure Figure 3
Figure 4(p. 6)figure Figure 4
Figure 5(p. 7)figure Figure 5

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Related Subjects

47 OTHER INSTRUMENTATION
Calorimeters
Gamma detectors (scintillators
CZT
HPG
HgI etc)
Gamma telescopes
Space instrumentation