Measurement of neutron and proton-induced background in germanium-gamma-ray spectrometers for use in a space environment

Details Measurement of neutron and proton-induced background in germanium-gamma-ray spectrometers for use in a space environment Measurement of neutron and proton-induced background in germanium-gamma-ray spectrometers for use in a space environment

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jphe...22..601e&link_type=abstract

Journal of Physics E - Scientific Instruments (ISSN 0022-3735), vol. 22, Aug. 1989, p. 601-611. Research supported by SERC.

Physics

2

Background Radiation, Gamma Ray Spectrometers, Neutrons, Protons, Radiation Damage, Satellite-Borne Instruments, Energetic Particles, Germanium, Irradiation, N-Type Semiconductors, Remote Sensing

Scientific paper

Particle-induced background in germanium spectrometers used for astrophysical and remote sensing measurements in a space environment provides an important limitation to the ultimate instrument sensitivity. To aid future experimental design and interpretation, laboratory exposure of typical sensors to known fluences of slow and fast neutrons and energetic protons is carried out to predict the line and continuum background components. Fast neutron elastic scatter is found to be the chief source of background below 100 keV for un unshielded detector inside a heavy spacecraft. At higher energies, comparable contributions are identified from neutron inelastic scattering and neutron-induced and proton-induced radioactivity. Radiation damage to an n-type high-purity Ge detector caused broadening in resolution by a factor of 1.8 after subjection to 1.2 x 10 to the 10th protons of 600 MeV.

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