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Electron paramagnetic resonance in dating of fossil organic remains

Frąckowiak M., Krzymieniewski R., Hercman H.

Geochronometria

2000

Vol. 19

59-64

The EPR method of dating is based on measurements of the concentration of paramagnetic centres generated by ionising radiation. The age (t) of a given sample is defined as the ratio of the geological dose (AD) to the annual dose (D). The geological dose is determined on the basis of the extrapolation of the EPR signal intensity dependence on the laboratory irradiation dose. The annual dose is the sum of an external (Dext) and internal (Dint) doses. The external dose is measured at the site of sample as intensity of delta radiation. The internal dose is determined by spectroscopic methods on the basis of the concentrations of uranium, thorium and potassium in the sample. This paper reports a determination of the geological dose of cave bear tooth enamel found in the Nietoperzowa Cave (Cracow Plain), performed at the Institute of Physics, Adam Mickiewicz University in Poznań.