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Luminescence dating quantifies the radiation exposure experienced by target minerals (usually quartzes or feldspars) from the sample as an “equivalent dose”, measured in Grays (Gy), and representing the mean radiation dose which would reproduce the observed natural signal levels of the sample as prepared in the laboratory.

The “dose rate”, measured in m Gy/a, is determined by combining field and laboratory analyses of the levels of naturally occurring radionuclides and cosmic radiation with an appropriate microdosimetric model for the mineral phase in question.

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Within Scotland this has been used to date, for example the re-setting of the Hilton of Cadboll stone, and other monuments in Orkney including the ditch-fills of the Ring of Brodgar within the World Heritage Site in Orkney.This has been applied to prehistoric settlements in Orkney, where there is evidence of abandonment of marginal settlements at times of environmental stress, and to Iron Age hut circles in the Scottish Borders, where abandonment coincides with the Roman occupation of the region.



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