1. A gamma ray spectrometer analyzed the chemical composition of the crust. 2. Davis's post-graduate work at the Cavendish Laboratory at double X-ray spectrometer . 3. The gamma-ray spectrometer was designed to detect these types of rocks. 4. He developed a high resolution x-ray spectrometer with a graduate student, John Harry Williams. 5. The crust of Venus was analyzed with the soil drill experiment and a gamma ray spectrometer . 6. It left a NEAR instrument, the gamma ray spectrometer , just 4 inches from the asteroid surface. 7. However, global-scale surface composition can be inferred from the Mars Odyssey gamma-ray spectrometer ( GRS ). 8. Germanium crystals are also used in X-ray spectrometers for the determination of phosphorus, chlorine and sulfur. 9. The rover's main instrument for analyzing soil and rock chemistry is an alpha proton X-ray spectrometer . 10. This effectively shut down the X-ray Spectrometer ( XRS ), which was the spacecraft's primary instrument.
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