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Detection of Outgassing RadoN (DORN)


Mission Name: Chang'e 6


The Detection of Outgassing RadoN (DORN) experiment is being done in collaboration with the Institute for Research in Astrophysics and Planetology (IRAP) in France. It's primary scientific objectives are to measure radon at the lunar surface, to study the origin of the lunar exosphere through radon outgassing and to study the transport of gases in the exosphere. It will also be measuring the radon flux from the lunar regolith to help understand how it can distort measurements of uranium taken by orbiting spacecraft, in order to improve orbital estimates. It will also measure polonium, a decay product of radon that becomes embedded in the regolith, to help understand dust transport and levitation.

DORN has a mass of 4.5 kg, is 25 x 27 x 42 cm in size, and is mounted on the lander. It comprises an alpha spectrometer with 16 silicon detectors and pulse acquisition and processing electronics. It will make hours of measurements during cruise and in lunar orbit, and will operate for about 30 hours on the Moon's surface prior to lift off of the sample return capsule.

Alternate Names

  • Change6/DetectionofOutgassingRadoN(DORN)
  • DORN

Facts in Brief

Mass: 4.5 kg

Funding Agency

  • China National Space Administration (Peoples Republic of China)


  • Planetary Science: Geology and Geophysics

Additional Information

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



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