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High Efficiency, Spectroscopic CZT Array

  • L. Cirignano (a1), M. Klugerman (a1), Y. Dmitriyev (a1), P. Bennett (a1), K. S. Shah (a1), P. Bloser (a1), T. Narita (a2) and J. Grindlay (a2)...

Abstract

Compact, efficient, spectroscopic detector arrays which preferably operate without cooling have applications in the fields of x-ray astronomy, nuclear medicine and radioactive materials management. We have fabricated a 16 element CdZnTe detector array that provides a stopping efficiency of greater than 80%, a photopeak fraction of 44% and an energy resolution of 3.2 keV FWHM at 122 keV. The 4 × 4 array uses a pixel size of(1.5 mm)2 with 0.2 mm spacing on a 5 mm thick substrate. The variation in spectroscopic properties amongst pixels has been characterized in terms of energy resolution and detection efficiency. Operation in current (or flux) mode for transmission imaging has also been investigated.

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