Instrument Information
IDENTIFIER urn:nasa:pds:context:instrument:grs.near::1.1
NAME GAMMA RAY SPECTROMETER
TYPE
DESCRIPTION 
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.
MODEL IDENTIFIER
NAIF INSTRUMENT IDENTIFIER -93004
SERIAL NUMBER
REFERENCES Evans, L.G., P.E. Clark, and J.I. Trombka, Acta Astron., Vol. 35, pp. 79-88, 1995.

Goldsten, J.O., The NEAR X-Ray/Gamma-Ray Spectrometer, Johns Hopkins APL Technical Digest, Vol. 19, pp. 126-135, 1998.

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.

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.

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.