Further measurements are presented of the thermoluminescence of meteorites, and the possible effects of various factors on meteorite thermoluminescence are considered. Glow curves were determined as a function of temperature for powdered samples of 21 meteorites, and the peak height ratios and plateau shapes in the comparison of natural with artificial thermoluminescence were examined. Results demonstrate that the apparent division of the 19 meteorites studied by Sears and Mills (1974) into groups characterized by different rates of the thermal fading of thermoluminescence was spurious, and are instead used to distinguish between two types on the basis of peak height ratios. Consideration is then given to meteorite classes, shielding, heating by man and atmospheric passage, terrestrial age, albedo, shock, cosmic-ray exposure and meteoroid orbits as possible factors responsible for the different behaviors observed. It is concluded that orbital considerations offer the best interpretation of the approximately 20% of the meteorites observed to have extremely low peak heights, which accordingly would have had orbits which took them nearer the sun than the others.
- Pub Date:
- Solar Orbits;
- Shock Heating;
- Temperature Distribution;
- Lunar and Planetary Exploration;