The optical bleaching of thermoluminescence in K-feldspar

The thermoluminescence (TL) of K-feldspar extracted from sediment was bleac hed by means of a sunlight simulator. The differences in the TL bleaching e fficiency of different trap groups are correlated with significant differen ces between trap parameters. The fractional glow technique applied for the investigation of optically bleached samples reveals the coexistence of vari ous trap groups which are active in the same temperature region over 300 de greesC. This gives rise to a growth curve (i.e. the TL intensity dependence on dose) with linear and nonlinear regions.