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