| 词条 | Gamma Ray Spectrometer (2001 Mars Odyssey) |
| 释义 |
The Gamma Ray Spectrometer (GRS) is a gamma-ray spectrometer on the 2001 Mars Odyssey spacecraft, a space probe orbiting the planet Mars since 2001. Part of NASA's Mars Surveyor 2001 program, it returns geological data about Mars's surface such as identifying elements and the location of water. It is maintained by the Lunar and Planetary Laboratory at the University of Arizona in the United States. This instrument has mapped the distribution surface hydrogen, thought to trace water in the surface layer of Martian soil.[1] GRS specificationsThe Gamma Ray Spectrometer weighs {{convert|30.5|kg|lbs}} and uses 32 watts of power. Along with its cooler, it measures {{convert|468|by|534|by|604|mm|in}}. The detector is a photodiode made of a {{convert|1.2|kg|lb|adj=on}} germanium crystal, reverse biased to about 3 kilovolts, mounted at the end of a {{convert|6|m|ft|adj=on}} boom to minimize interferences from the gamma radiation produced by the spacecraft itself. Its spatial resolution is about {{convert|300|km|mi}}.[2][3] The neutron spectrometer is {{convert|173|by|144|by|314|mm|in}}. The high-energy neutron detector measures {{convert|303|by|248|by|242|mm|in}}. The instrument's central electronics box is {{convert|281|by|243|by|234|mm|in}}. References1. ^{{cite web |url=http://grs.lpl.arizona.edu/latestresults.jsp |title=Gamma Ray Spectrometer : Latest Results |date=January 2008 |publisher=Lunar and Planetary Laboratory, University of Arizona |accessdate=2018-01-08}} 2. ^{{cite journal | title = The Mars Odyssey Gamma-Ray Spectrometer Instrument Suite | first1 = W. V. |last1 = Boynton |first2=W. C. |last2=Feldman |first3=I. G. |last3=Mitrofanov |first4=L. G. |last4=Evans |first5=R. C. |last5=Reedy |first6=S. W. |last6=Squyres |first7=R. |last7=Starr |first8=J. I. |last8=Trombka |first9=C. |last9=d'Uston |first10=J. R. |last10=Arnold, |first11=P. A. J. |last11=Englert |first12=A. E. |last12=Metzger |first13=H. |last13=Wänke |first14=J. |last14=Brückner |first15=D. M. |last15=Drake |first16=C. |last16=Shinohara |first17=C. |last17=Fellows |first18=D. K. |last18=Hamara |first19=K. |last19=Harshman |first20=K. |last20=Kerry |first21=C. |last21=Turner |first22=M. |last22=Ward |first23=H. |last23=Barthe |first24=K. R. |last24=Fuller |first25=S. A. |last25=Storms |first26=G. W. |last26=Thornton |first27=J. L. |last27=Longmire |first28=M. L. |last28=Litvak |first29=A. K. |last29=Ton'chev | journal = Space Science Reviews | volume = 110 | issue = 1–2 | doi = 10.1023/B:SPAC.0000021007.76126.15 | date = 2004 | pages = 37 | bibcode=2004SSRv..110...37B}} 3. ^{{cite web |url=https://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.do?id=2001-014A |title=2001 Mars Odyssey |work=NASA Space Science Data Coordinated Archive |publisher=NASA |accessdate=2018-01-08}} External links
3 : 2001 Mars Odyssey|Spectrometers|Spacecraft instruments |
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