GAMMA RAY SPECTROMETER for NEAR

urn:nasa:pds:context:instrument:grs.near 1.1 GAMMA RAY SPECTROMETER for NEAR 1.14.0.0 Product_Context 2023-05-12 1.1 Removed extraneous external references, replaced description with a short summary, and added NAIF instrument ID and Type List Area 2016-10-01 1.0 extracted metadata from PDS3 catalog and modified to comply with PDS4 Information Model urn:nasa:pds:context:instrument_host:spacecraft.near instrument_to_instrument_host Evans, L.G., P.E. Clark, and J.I. Trombka, Acta Astron., Vol. 35, pp. 79-88, 1995. reference.EVANSETAL1995 Goldsten, J.O., The NEAR X-Ray/Gamma-Ray Spectrometer, Johns Hopkins APL Technical Digest, Vol. 19, pp. 126-135, 1998. reference.GOLDSTEN1998 Goldsten, J.O., R.L. McNutt, R.E. Gold, S.A. Gary, E. Fiore, S.E. Schneider, J.R. Hayes, J.I. Trombka, S.R. Floyd, W.V. Boynton, S. Bailey, J. Bruckner, S.W. Squyres, L.G. Evans, P.E. Clark, and R. Starr, The X-Ray/Gamma-Ray Spectrometer on the Near Earth Asteroid Rendezvous Mission, Space Sciences Review, Vol. 82, pp. 169-216, 1997. reference.GOLDSTENETAL1997 Starr, R., P.E. Clark, L.G. Evans, S.R. Floyd, T.P. McClanahan, J.I. Trombka, J.O. Goldsten, R.H. Maurer, R.L. McNutt, Jr., and D.R. Roth, Radiation effects in the Si-PIN detector on the Near Earth Asteroid Rendezvous Mission, Nuclear Instruments and Methods in Physics Research Section A, Vol. 428, pp. 209-215, 1999. reference.STARRETAL1999 Trombka, J., S. Floyd, W. Boynton, S. Bailey, J. Bruckner, S. Squyres, L. Evans, P. Clear, R. Starr, E. Fiore, R. Gold, J. Goldsten, and R. McNutt, Compositional Mapping With The Near X-ray/Gamma-ray Spectrometer, J. Geophys. Res., Vol. 102, pp. 23729-23750, 1997. reference.TROMBKAETAL1997 GAMMA RAY SPECTROMETER Gamma Ray Detector Spectrometer -93004 The NEAR GRS is part of the X-Ray/Gamma-Ray Spectrometer (XGRS) suite on the NEAR mission. It detects characteristic gamma rays in the 0.3- to 10-MeV range that are emitted from specific elements in the surface. Some of these emissions are excited by cosmic rays and some arise from natural radioactivity in the asteroid. The GRS uses a body-mounted passively cooled NaI scintillator detector with a bismuth germanate anticoincidence shield that defines a 45 FOV, with an objective of measuring abundances of several important elements such as K, Si, and Fe in four quadrants of the asteroid.