MESSENGER - XRS.jpg

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Summary

DescriptionMESSENGER - XRS.jpg	English: "XRS maps the elements in the top millimeter of Mercury’s crust using three gas-filled detectors (Mercury X-Ray Unit, or MXU) pointing at the planet, one silicon solid-state detector pointing at the Sun (Solar Assembly for X-rays, or SAX), and the associated electronics (Main Electronics for X-rays, or MEX). The planet-pointing detectors measure fluorescence, the X-ray emissions coming from Mercury’s surface after solar X-rays hit the planet. The Sun-pointing detector tracks the X-rays bombarding the planet. XRS detects emissions from elements in the 1-10 kiloelectron-volt (keV) range – specifically, magnesium, aluminum, silicon, sulfur, calcium, titanium, and iron. Two detectors have thin absorption filters that help distinguish among the lower-energy X-ray lines of magnesium, aluminum, and silicon. Beryllium-copper honeycomb collimators give XRS a 12° field of view, which is narrow enough to eliminate X-rays from the star background even when MESSENGER is at its farthest orbital distance from Mercury. The small, thermally protected, solar-flux monitor is mounted on MESSENGER’s sunshade."
Source	http://messenger.jhuapl.edu/instruments/XRS.html
Author	NASA / JHU/APL

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current	22:36, 25 January 2011		250 × 191 (18 KB)	wikimediacommons>Xession	{{Information \|Description ={{en\|1="XRS maps the elements in the top millimeter of Mercury’s crust using three gas-filled detectors (Mercury X-Ray Unit, or MXU) pointing at the planet, one silicon solid-state detector pointing at the Sun (Solar Assem

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