Apollo 17 mission Report. Supplement 6: Calibration results for gamma ray spectrometer sodium iodide crystal

Details Apollo 17 mission Report. Supplement 6: Calibration results for gamma ray spectrometer sodium iodide crystal Apollo 17 mission Report. Supplement 6: Calibration results for gamma ray spectrometer sodium iodide crystal

Mar 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975gsfc.rept.....d&link_type=abstract

Final Report National Aeronautics and Space Administration. Goddard Space Flight Center, Greenbelt, MD.

Astronomy and Astrophysics

Astronomy

Apollo 17 Flight, Gamma Rays, Sodium Iodides, Spectrometers, Charged Particles, Cosmic Rays, Radiation Detectors, Tantalum Compounds

Scientific paper

A major difficulty in medium energy gamma-ray remote sensing spectroscopy and astronomy measurements was the high rate of unwanted background resulting from the following major sources: (1) prompt secondary gamma-rays produced by cosmic-ray interactions in satellite materials; (2) direct charged-particle counts; (3) radioactivity induced in the detector materials by cosmic-ray and trapped protons; (4) radioactivity induced in detector materials by the planetary (e.g., earth or moon) albedo neutron flux; (5) radioactivity induced in the detector materials by the interaction of secondary neutrons produced throughout the spacecraft by cosmic-ray and trapped proton interactions; (6) radioactivity induced in spacecraft materials by the mechanisms outlined in 3, 4, and 5; and (7) natural radioactivity in spacecraft and detector materials. The purpose of this experiment was to obtain information on effects 3, 4, and 5, and from this information start developing calculational methods for predicting the background induced in the crystal detector in order to correct the Apollo gamma-ray spectrometer data for this interference.

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