Rare gases implanted in lunar fines

Rare gases implanted into lunar fines can be used to study processes in the lunar regolith as well as solar abundances. A short outline of some basic results about the distribution of solar rare gases in lunar soils is given and illustrated by two case studies: (1) Evidence for local endogenic activity near Shorty Crater is inferred from rare gas fractionations in soil 74241. (2) Rare gas concentration profiles measured with a new technique in single lunar soil particles underline the importance of radiation damage as a governing factor of migration and promise future possibilities to determine ancient solar abundances free of secondary bias. (author)