Solar-flare exposure and thermoluminescence of Luna 24 core material

Details Solar-flare exposure and thermoluminescence of Luna 24 core material Solar-flare exposure and thermoluminescence of Luna 24 core material

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980rspta.297...41d&link_type=abstract

Royal Society (London), Philosophical Transactions, Series A, vol. 297, no. 1428, June 17, 1980, p. 41-50. Research supported b

Computer Science

Core Sampling, Lunar Soil, Lunik Lunar Probes, Solar Activity Effects, Solar Flares, Thermoluminescence, Granular Materials, Lunar Surface, Minerals, Particle Tracks, Radiation Effects, Moon, Samples, Lunar, Luna 24, Core-Tube Samples, Thermoluminescence, Solar Flares, Exposure, Minerals, Grains, Depth, Density, Models, Gradients, Observations, Deposition, Irradiation, Comparisons, Data, Radioactivity, Mixing, History, 24090, 24125, 24196, Particle Tracks, Photographs, Temperatures, Glow Curve, Maturity, Pr

Scientific paper

Mineral grains from three depths within the Luna 24 drill core (approximately 90, 125 and 196 cm) have been examined for solar-flare tracks. Large proportions (55-100%) of grains from all three levels are found to be track-rich (with central track densities greater than 100 million/sq cm), and a substantial fraction (approximately 25-50%) of all grains display track-density gradients. These observations indicate that most of the mineral grains have been cycled through the top at approximately 1 mm of the lunar surface at some time in their history. The most likely depositional model envisages rapid infall of highly irradiated material into a less mature local component with little subsequent reworking. Thermoluminescence (TL) studies indicate a lower natural radiation dose in samples from the 196 cm level compared with those from the two upper levels. This can result either from random variations in the local internal radioactivity or from mixing properties of the pre-irradiated material over time scales of less than approximately 100 ka. Radiation sensitization of samples suggests a possible use of TL sensitivity for the interpretation of lunar radiation history.

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