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Mars Radiation Environment Experiment (MARIE)

NSSDCA ID: 2001-014A-03

Mission Name: 2001 Mars Odyssey
Principal Investigator:Mr. Gautam Badhwar, III


The Mars Radiation Environment Experiment (MARIE) is an energetic particle spectrometer designed to measure the near space radiation environment as related to the radiation hazard to human explorers. Specifically, MARIE will determine the energy deposition spectrum from 0.1 keV/micrometer to 1500 keV/micrometer, separate the contribution of proton, neutrons, and HZE particles, measure the accumulated absorbed dose and dose rate which would occur in tissue, and determine the radiation quality factor.

The spectrometer consists of two 24 x 24 position sensitive detectors (each roughly 2.5 cm x 2.5 cm in size) and two 2.5 cm x 2.5 cm silicon detectors. These are backed by two 1.78 x 1.78 cm proportional counters, one total energy proportional counter (TEPC) and one charged proportional counter (CPC). There are two 0.9 microCurie alpha sources and two 40 torr propane vessels. Data is saved on 60 Mb of flash memory and transferred at <8 Mbits per day over an RS-422 low speed data line. The entire unit is 10.2 cm x 17.8 cm x 29.2 cm. The field of view is 56 degrees and energy is measured in 512 channels covering the 0.1 to 1500 keV/micrometer range.

During the cruise to Mars, in August, the MARIE instrument failed to respond during a routine data transfer and was put into hibernation. Attempts to revive the instrument were successful in March 2002 and MARIE began taking scientific data from orbit on 13 March. The instrument failed on 28 October 2003 during a period of intense solar activity. Efforts to revive the instrument will continue.

Alternate Names

  • 2001MarsOdyssey/MARIE

Facts in Brief

Mass: 3.3 kg
Power (avg): 7 W

Funding Agency

  • NASA-Office of Space Science Applications (United States)


  • Planetary Science: Fields and Particles

Additional Information

Questions and comments about this experiment can be directed to: Dr. David R. Williams



NameRoleOriginal AffiliationE-mail
Mr. Gautam Badhwar, IIIPrincipal InvestigatorNASA Johnson Space Center

Selected References

  • Badhwar, G. D., Martian Radiation EnvIronment Experiment (MARIE), Space Sci. Rev., 110, No. 1-2, 131-142, 2004.
  • Zeitlin, C., et al., Overview of the Martian radiation environment experiment, Adv. Space Res., 33, No. 12, 2204-2210, 2004.
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