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Gamma-Ray Spectrometer

NSSDCA ID: 1972-031A-07

Mission Name: Apollo 16 Command and Service Module (CSM)
Principal Investigator:Dr. James R. Arnold

Description

This experiment, carried on board the command module of the Apollo 16 mission, was used to conduct a geochemical mapping of the lunar surface by observing the emitted gamma radiation from the lunar surface. During the transearth coast phase of the mission, this experiment was used for gamma-ray astronomy. The instrument consisted of a thallium activated sodium iodide scintillation crystal enclosed in a plastic scintillator shield that was placed in anticoincidence with the sodium iodide crystal to prevent events caused by charged particles. In normal operation, the instrument was deployed on a 7.6-m boom to decrease the response of the instrument to cosmic-ray interaction and radioactvie sources in the spacecraft. The energy resolution was 7.5%. The angular resolution on the lunar surface was approximately 2 to 3 deg, or 70 mm.

Alternate Names

  • Apollo16CSM/Gamma-RaySpectrometer
  • S160

Funding Agency

  • NASA-Office of Manned Space Flight (United States)

Disciplines

  • Solar Physics: Gamma Ray
  • Astronomy: Gamma Ray
  • Planetary Science: Geology and Geophysics

Additional Information

Questions and comments about this experiment can be directed to: Dr. David R. Williams

 

Personnel

NameRoleOriginal AffiliationE-mail
Dr. Jacob I. TrombkaOther InvestigatorNASA Goddard Space Flight Center
Prof. Laurence E. PetersonOther InvestigatorUniversity of California, San Diegolepeterson@ucsd.edu
Dr. Albert E. MetzgerOther InvestigatorNASA Jet Propulsion Laboratoryaem@eros.jpl.nasa.gov
Dr. James R. ArnoldPrincipal InvestigatorUniversity of California, San Diegojarnold@ucsd.edu

Selected References

  • Arnold, J. R., et al., Gamma ray spectrometer experiment, in Apollo 16, Prelim. Sci. Rept., NASA SP-315, 18-1, Wash., DC, 1972.
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