Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aps..mar.p2004p&link_type=abstract
American Physical Society, Annual APS March Meeting 2003, March 3-7, 2003, , abstract #P2.004
Astronomy and Astrophysics
Astrophysics
Scientific paper
CdZnTe is a wide bandgap semiconductor that is used for gamma ray spectroscopy at room temperature. Single-crystals larger than 1 cm3 are now commercially available. The pulse height resolution that can be achieved routinely with crystals of this size is better than 20 keV full-width-at-half-maximum at 662 keV, which can be compared to >50 keV for NaI(Tl). Spectrometers with volumes larger than 1 cm3 can be manufactured by combining multiple single crystals in an array with little or no loss in pulse height resolution. Consequently, CdZnTe is being considered for applications where improved resolution is needed in combination with low-power consumption and portability. Applications for the technology include nuclear material safeguards, customs inspections at borders, treaty verification, the detection of nuclear explosions from high altitude, nuclear medicine, astrophysics, and planetary science. An array of CdZnTe detectors is being developed for Dawn, which is a NASA Discovery mission. The Dawn mission will explore complementary protoplanets 1 Ceres and 4 Vesta, whose accretion was interrupted by the early formation of Jupiter. The science payload, which includes a gamma ray and neutron spectrometer, will determine the composition and structure of these protoplanetary bodies, providing context for a large number of primitive meteorites in our sample collection and a better understanding of processes occurring shortly after the onset of condensation of the solar nebular. This presentation will describe the development of the CdZnTe array for Dawn, the expected science return, and engineering issues unique to CdZnTe, including measures to mitigate the effect of radiation damage during the nine year mission to the asteroid belt.
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