Fossil track and thermoluminescence studies of Luna 20 material

Details Fossil track and thermoluminescence studies of Luna 20 material Fossil track and thermoluminescence studies of Luna 20 material

Apr 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973gecoa..37..825c&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 37, Issue 4, pp.825-830

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Scientific paper

Track densities in 85 feldspar crystals from L-2009 range from 2.5 × 10 6 / cm 2 to > 10 9 /cm 2 . This track distribution represents an intermediate case between what have been previously defined as lightly and heavily irradiated soils and suggests that the Luna 20 sample consists of a mixture of a mature, heavily irradiated component with another, lightly irradiated component. Using a two component mixing model, the age of the lightly irradiated component is ~270 × 10 6 yr. It is possible, but by no means certain, that this is associated with the formation of the crater Apollonius C. At ~200°C the ratio of natural TL to that induced by a standard irradiation is similar to that in Apollo 12 and 14 cores below ~7 cm. This confirms that most of the Luna 20 sample represents sub-surface material.

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