11. One is a gamma ray spectrometer to map amounts of many chemical elements in the lunar crust. 12. The X-ray Spectrometer was used to investigate the properties of the upper layers of the lunar surface. 13. The Alpha Particle X-ray Spectrometer ( APXS ) found rather high levels of phosphorus in the rocks. 14. An X-ray spectrometer , an X-ray telescope, "'Cosmic Ray Detector "', and a Laser device were also included. 15. It is on the far side of the Moon and was found by a gamma-ray spectrometer in 1998. 16. The gamma-ray spectrometer looks at these signatures, or energies, coming from the elements present in the target soil. 17. It is a gamma-ray spectrometer , which will read gamma rays to determine what elements exist on the surface. 18. In his first year of graduate school he published his first paper about a double crystal x-ray spectrometer . 19. Gamma ray spectrometers don't use prisms. 20. Pathfinder's Sojourner Rover is taking its Alpha Proton X-ray Spectrometer measurement of the Yogi Rock ( NASA ).
