Abstract
The emanation characteristics of eight bulk lunar fines samples with 0.5 to 10.0 grams plus one small sample of Kreep glass were analysed by alpha cintillation counting techniques. The objective was to investigate the problem of radon mobility on the lunar surface and its possible contribution to the lead isotopic fractionation and redistribution, particularly its contribution to the anomalous U 238 /Pb 206 isotopic ratios. The samples were de-emanated at room temperature and a pressure of one atmosphere. An uniformily low radon escape rates and losses were observed in the analysed material. Three terrestrial analogues (obsidian, tektite and W-l) were analysed for comparison purposes. The observed data suggest that very little Rn 222 is escaping from the soil at the lunar surface and therefore it has a small direct contribution to the excess of isotopic lead.
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