Abstract
A method using saturation transfer EPR (ST-EPR) is shown to be feasible for detecting EPR signal of radiation-induced defects in biocarbonates containing large amount of Mn 2+. The ST-EPR measurements conducted at room temperature on fish fossil of Brazilian origin, enabled the identification of CO 2 − and SO 3 − radical ions, by partially suppressing the intense signal from Mn 2+ when the signal are detected 90° out of phase with magnetic field modulating signal and at high microwave power (50 mW) . Using these signals the age of fish fossil is estimated to be (36±5) Ma.
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