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Proceedings Paper

Performance of multielement CdZnTe detectors
Author(s): Calvin E. Moss; Kiril D. Ianakiev; Thomas H. Prettyman; Robert Paul Reedy; Morag K. Smith; Martin R. Sweet; John Valentine
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Paper Abstract

Single-element CdZnTe detectors are limited in size, and therefore efficiency, by the poor hole transport, even with a coplanar grid. We are investigating the possibility of a 27-element array using 15 mm X 15 mm X 15 mm elements for gamma-ray energies to 10 MeV for NASA planetary missions. We present experimental results for combinations of various size coplanar grid detectors using NIM electronics and energies to 6.1 MeV. Summation of the signals after linear gating and requiring coincidence produces only a small increase in the energy resolution. Our results indicate that good efficiency and spectrum not complicated by a large Compton continuum can be achieved by simply summing the spectra from 15 X 15 X 15 mm3 detectors for gamma-ray energies below about 2 MeV. Above 2 MeV, 2-fold coincidence might be required, depending on the spectrum, to suppress the Compton continuum and escape peaks. We use a Monte Carlo calculation to predict the performance of the 27-elements array for a lunar highlands spectrum. Such ambient-temperature, high-efficiency, good- resolution arrays will facilitate new NASA mission to determine elemental composition of planetary bodies and terrestrial applications requiring high-efficiency, good- resolution portable instruments.

Paper Details

Date Published: 19 October 1999
PDF: 10 pages
Proc. SPIE 3768, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics, (19 October 1999); doi: 10.1117/12.366597
Show Author Affiliations
Calvin E. Moss, Los Alamos National Lab. (United States)
Kiril D. Ianakiev, Los Alamos National Lab. (United States)
Thomas H. Prettyman, Los Alamos National Lab. (United States)
Robert Paul Reedy, Los Alamos National Lab. (United States)
Morag K. Smith, Los Alamos National Lab. (United States)
Martin R. Sweet, Los Alamos National Lab. (United States)
John Valentine, Georgia Institute of Technology (United States)

Published in SPIE Proceedings Vol. 3768:
Hard X-Ray, Gamma-Ray, and Neutron Detector Physics
Ralph B. James; Richard C. Schirato, Editor(s)

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