High-altitude balloon flight of CdZnTe detectors for high-energy x-ray astronomy: II

Kimberly R. Slavis; Paul F. Dowkontt; Fred Duttweiller; John W. Epstein; Paul L. Hink; George L. Huszar; Philippe C. Leblanc; James L. Matteson; Robert T. Skelton; Edwin A. Stephan

doi:10.1117/12.366520

22 October 1999 High-altitude balloon flight of CdZnTe detectors for high-energy x-ray astronomy: II

Kimberly R. Slavis, Paul F. Dowkontt, Fred Duttweiller, John W. Epstein, Paul L. Hink, George L. Huszar, Philippe C. Leblanc, James L. Matteson, Robert T. Skelton, Edwin A. Stephan

Author Affiliations +

Proceedings Volume 3765, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy X; (1999) https://doi.org/10.1117/12.366520
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

Cadmium Zinc Telluride (CZT) is a room temperature semiconductor detector well suited for high energy x-ray astronomy. We have developed a CZT detector with 500 micron crossed strip readout and an advanced electrode design that greatly improves energy resolution. We conducted two balloon flights from Fort Sumner, NM, to study the cross strip detector and a standard planar detector both sensitive in the energy range of 20-350 keV. The flights utilized a total of seven shielding schemes: 3 passive, 2 active and 2 hybrid passive-active. In the active shielding modes, the anti- coincidence shield pulse heights were telemetered for each CZT event, allowing us to study the effect of the shield's energy threshold on the spectral shape and magnitude of the background. We are also developing an energy-dependent background rejection technique based on the charge collection properties of the CZT detector. This technique employs the depth of interaction, as inferred by the ratio of cathode to anode pulse height, to reject events inconsistent with incident source x-rays. The long duration of the May flight enabled us to study activation effects. We present result of the effectiveness of each of the shielding schemes on both detectors, the rejection power of depth of interaction technique on the crossed strip detector, inferred aperture background flux and the level of activation after 22 hours as float.

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Kimberly R. Slavis, Paul F. Dowkontt, Fred Duttweiller, John W. Epstein, Paul L. Hink, George L. Huszar, Philippe C. Leblanc, James L. Matteson, Robert T. Skelton, and Edwin A. Stephan "High-altitude balloon flight of CdZnTe detectors for high-energy x-ray astronomy: II", Proc. SPIE 3765, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy X, (22 October 1999); https://doi.org/10.1117/12.366520

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