Fusion Crust and the Measurement of Surface Ages of Antarctic Ordinary Chondrites

Details Fusion Crust and the Measurement of Surface Ages of Antarctic Ordinary Chondrites Fusion Crust and the Measurement of Surface Ages of Antarctic Ordinary Chondrites

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997nasa.reptv....a&link_type=abstract

Technical Report, NASA/CR-97-207735; NAS 1.26:207735 Dept. of Chemistry and Biochemistry

Computer Science

Crusts, Thermoluminescence, Radioactive Isotopes, Atmospheric Temperature, Chondrites, Radioactivity, Galactic Cosmic Rays, Antarctic Regions, Interstellar Space, Radiation Dosage, Surface Layers

Scientific paper

Natural thermoluminescence (TL) reflects radiation exposure and storage temperature. Meteorites generally exhibit thermoluminescence acquired during their long exposure to galactic cosmic rays in space. During atmospheric passage, temperatures are high enough to completely drain the TL, in the first mm of material under the fusion crust. We therefore refer to this surface layer as "fusion crust" although it does include some unmelted material just below the crust. When the meteorite lands on earth this drained layer will begin to build up natural TL once again due to radiation from cosmic rays and internal radionuclides. Cosmic ray annual dose is estimated to be between 0.04 and 0.06 rad/yr on the earth's surface in Antarctica while the internal radionuclides contribute only about 0.01 rad/yr. Therefore the total annual dose received by the meteorite while it is on the surface is between 0.05 and 0.07 rad/yr. If the meteorite is buried deeply in the ice it is effectively shielded from most cosmic rays and thus only internal radioactivity contributes to the annual dose.

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