Thorium is a naturally radioactive element that exists in rocks and soils in extremely small amounts. The region of highest thorium content, shown in red on this gamma ray spectrometer map from NASA's Mars Odyssey, is in northern Acidalia Planitia.
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Map of Martian Thorium at Mid-Latitudes

This gamma ray spectrometer map of the mid-latitude region of Mars is based on gamma-rays from the element thorium. Thorium is a naturally radioactive element that exists in rocks and soils in extremely small amounts. The region of highest thorium content, shown in red, is found in the northern part of Acidalia Planitia (50 degrees latitude, -30 degrees longitude). Areas of low thorium content, shown in blue, are spread widely across the planet with significant low abundances located to the north of Olympus Mons (near 55 degrees latitude, -155 degrees longitude), to the east of the Tharsis volcanoes (-10 degrees latitude, -80 degrees longitude) and to the south and east of Elysium Mons (20 degrees latitude, 160 degrees longitude). Contours of constant surface elevation are also shown. The long continuous contour line running from east to west marks the approximate separation of the younger lowlands in the north from the older highlands in the south.

NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The gamma ray spectrometer was provided by the University of Arizona, Tucson. Lockheed Martin Astronautics, Denver, Colo., is the prime contractor for the project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.

Image details

ID#:
PIA04257

Date added:
2003-03-13

Target:
Mars

Mission:
2001 Mars Odyssey

Spacecraft:
2001 Mars Odyssey

Instruments:
Gamma Ray Spectrometer Suite

Size:
2068 x 947 pixels (width x height)

Rating:



Views:
3,748

Full-Res TIFF:
PIA04257.tif (2.5 MB)

Full-Res JPG:
PIA04257.jpg (0.17 MB)

Image credit:
NASA/JPL/University of Arizona