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Using pressed powder pellets of reference materials, a series of calibration images were exposed, from which a functional relation between specific sample activity and greyscale value in the autoradiographic image has been deduced.
Testing the calibration on a set of 16 geological samples, of which their radionuclide content is known, shows a good correlation between specific activities calculated from the nuclide content and specific activities deduced from the autoradiographic images.
These findings illustrate the potential of autoradiography with imaging plates to detect spatial distributions of radionuclides and to tackle certain aspects of the problem of microdosimetry in modern trapped charge dating.
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Multi-method (TL and OSL), multi-material (quartz and flint) dating of the Mousterian site of Roc de Marsal (Dordogne, France): correlating Neanderthal occupations with the climatic variability of MIS 5–3Guillaume Guérin, Emmanuel Discamps, Christelle Lahaye, Norbert Mercier, Pierre Guibert, Alain Turq, Harold L.
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Qualitative evaluations of radiation inhomogeneity are carried out on unconsolidated sediments as well as on hard rock samples.
While indicating some limitations of applicability, the results demonstrate that the method is an efficient tool to detect and document spatial variations in a sample's radiation field.
It therefore provides a possibility to rapidly screen samples to check whether microdosimetry might affect the D data.
Furthermore, an approach to calibrate autoradiographic images for quantitative use is suggested.