Computer Science
Scientific paper
Jan 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000phdt.......103k&link_type=abstract
PhD Dissertation, NASA Goddard Space Flight Center Greenbelt, MD United States
Computer Science
Gamma Rays, Bursts, Spectroscopy, Imaging Techniques, Cadmium Tellurides, Line Spectra, Arid Lands, Cosmic Rays, Deep Space, Exposure, Gamma Ray Spectrometers, Germanium, High Resolution, Prototypes, Radiation Damage, Space Flight, X Rays
Scientific paper
Gamma-ray bursts have been detected with spacecraft for over thirty years, yet their origin remains an outstanding mystery. Previous experiments reported spectral lines in some bursts that, if confirmed, would provide important insights into the nature of these phenomena. The Transient Gamma-Ray Spectrometer, TGRS, has been operating for four years arid a search for spectral lines in bursts detected with this instrument has been unable to confirm previous observations. Spectral lines may occur only rarely, only in certain types of gamma-ray burst, or below the threshold of this detector. TGRS is the only germanium gamma-ray spectrometer to complete a mission in deep space, and this instrument has gradually degraded due to long term exposure to cosmic rays. Long term monitoring of this degradation has extended our understanding of radiation damage to germanium detectors to include the effects of long duration spaceflight. Future missions will emphasize high spatial resolution imaging of gamma-ray bursts, and Cadmium Zinc Telluride (CZT) based detectors have been proposed for this purpose. Experiments performed on one prototype detector demonstrated the potential for this technology to produce high resolution images with hard X-ray radiation.
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