Performance of multielement CdZnTe detectors

Calvin E. Moss; Kiril D. Ianakiev; Thomas H. Prettyman; Robert Paul Reedy; Morag K. Smith; Martin R. Sweet; John Valentine

doi:10.1117/12.366597

19 October 1999 Performance of multielement CdZnTe detectors

Calvin E. Moss, Kiril D. Ianakiev, Thomas H. Prettyman, Robert Paul Reedy, Morag K. Smith, Martin R. Sweet, John Valentine

Author Affiliations +

Proceedings Volume 3768, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics; (1999) https://doi.org/10.1117/12.366597
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

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.

Citation Download Citation

Calvin E. Moss, Kiril D. Ianakiev, Thomas H. Prettyman, Robert Paul Reedy, Morag K. Smith, Martin R. Sweet, and John Valentine "Performance of multielement CdZnTe detectors", Proc. SPIE 3768, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics, (19 October 1999); https://doi.org/10.1117/12.366597

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