Solid State Studies of the Radiation History of Lunar Samples

Details Solid State Studies of the Radiation History of Lunar Samples Solid State Studies of the Radiation History of Lunar Samples

Jan 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970sci...167..563c&link_type=abstract

Science, Volume 167, Issue 3918, pp. 563-566

Physics

5

Scientific paper

Particle track densities up to > 3 × 109 per square centimeter have been measured in different samples. Rocks 17, 47, 57, and 58 have VH (Z >22) galactic cosmic ray ages of 11, 14, 28, and 13 × 106 years, respectively. Rock 57 has a calculated erosion rate of lesssim 10-7 centimeter per year. Near-surface track versus depth data in rock 17 can be fit with solar flare particles that have a differential energy spectrum α E-3; lunar samples can be used to study the history of solar activity. The uranium in the crystalline rocks occurs principally in small regions <10 to ~ 100 micrometers in size. The (low) thermoluminescence of the fines increases with depth in core 10004. With one possible exception, x-ray studies have not shown pronounced radiation damage effects. The total energy release upon heating is small up to 900 degrees C and occurs in three broad regions.

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