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Proceedings Paper

Background measurements from balloon-borne imaging CZT detectors
Author(s): Jonathan A. Jenkins; Tomohiko Narita; Jonathan E. Grindlay; Peter Forbes Bloser; Carl Michael Stahle; Bradford H. Parker; Scott D. Barthelmy
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Paper Abstract

We report detector characteristics and background measurements from two prototype imaging CdZnTe (CZT) detectors flown on a scientific balloon payload in May 2001. The detectors are both platinum-contact 10 mm × 10 mm × 5 mm CZT crystals, each with a 4 × 4 array of pixels tiling the anode. One is made from IMARAD horizontal Bridgman CZT, the other from eV Products high-pressure Bridgman CZT. Both detectors were mounted side-by-side in a flip-chip configuration and read out by a 32-channel IDE VA/TA ASIC preamp/shaper. We enclosed the detectors in the same 40o field-of-view collimator used in our previously-reported September 2000 flight. I-V curves for the detectors are diode-like, and we find that the platinum contacts adhere significantly better to the CZT surfaces than gold to previosu detectors. The detectors and instrumentation performed well in a 20-hour balloon flight on 23/24 May 2001. Although we discovered a significant instrumental background component in flight, it was possible to measure and subtract this component from the spectra. The resulting IMARAD detector background spectrum reaches ~5×10-3 counts cm-2s-1keV-1 at 100 keV and has a power-law index of ~2 at hgih energies. The eV Products detector has a similar spectrum, although there is more uncertainty in the enregy scale because of calibration complications.

Paper Details

Date Published: 11 March 2003
PDF: 9 pages
Proc. SPIE 4851, X-Ray and Gamma-Ray Telescopes and Instruments for Astronomy, (11 March 2003); doi: 10.1117/12.461537
Show Author Affiliations
Jonathan A. Jenkins, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Tomohiko Narita, College of the Holy Cross (United States)
Jonathan E. Grindlay, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Peter Forbes Bloser, Max-Planck-Institut fuer extraterrestrische Physik (Germany)
Carl Michael Stahle, NASA Goddard Space Flight Ctr. (United States)
Bradford H. Parker, NASA Goddard Space Flight Ctr. (United States)
Scott D. Barthelmy, NASA Goddard Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 4851:
X-Ray and Gamma-Ray Telescopes and Instruments for Astronomy
Joachim E. Truemper; Harvey D. Tananbaum, Editor(s)

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