After deposition of the grains and burial under new sediment, their latent luminescence signal accumulates again because they absorb the natural ionising radiation that is emitted by the surrounding sediment. The age that is determined corresponds to the time span between the removal of the luminescence signal by sunlight just before deposition and the removal of the newly accumulated palaeodose by thermal or optical stimulation in the laboratory.
Stimulation by heat is called thermoluminescence (TL) and stimulation by light, optical stimulated luminescence (OSL).
(to be defended at the Laboratory of analytical chemistry) Vandenberghe D.
(in preparation) A study of the optical stimulated luminescence dating method and its application to young geological sediments.
XRF can be used to test a wide range of materials from ceramics to metals and glass.