Activation of the ASTRO-E hard X-ray detector in low Earth orbit.

Details Activation of the ASTRO-E hard X-ray detector in low Earth orbit. Activation of the ASTRO-E hard X-ray detector in low Earth orbit.

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999itns...46..371k&link_type=abstract

IEEE Trans. Nucl. Sci., Vol. 46, No. 3, p. 371 - 376

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X-Ray Detectors: Space Instrumentation

Scientific paper

ASTRO-E hard X-ray detector (HXD) is characterized by well-type phoswich counters in a compound-eye configuration which reduce the detector background to lower level than any other past hard X-ray mission. When operating in low Earth orbit, the expected background of the HXD is an order of 10-5 counts/s/keV/cm2, mainly caused from the radioactivity induced within the detector materials by geomagnetically trapped protons. Results are presented from measurements of induced radioactivity in two phoswich scintillators, GSO (Gd2SiO5:Ce 0.5% mol) and BGO (Bi4Ge3O12), irradiated by mono-energetic protons at an accelerator facility. Radiation transport computer codes are used to build the detector response functions for emissions from decays of spallation products. Based on the comparison between experimental and simulation results, the activation background level of HXD in the orbit is estimated.

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