ESR dating of palaeolithic calcite: A comparison between powder and monocrystal spectra with thermal annealing |
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| Authors: | Yuji Yokoyama Roland Bibron Concle Leger |
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| Institution: | Yuji Yokoyama, Roland Bibron,Concèle Leger |
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| Abstract: | Evolution of ESR spectra with thermal annealing at different temperatures is studied for a monocrystal calcite taken in the Orgnac III site. Up to 20 ESR lines are recognized from the angular dependence of these lines. These lines are compared with the ESR lines observed for powder and rotating monocrystal calcites.The h1 line (g = 2.0057) and h3 line (g = 2.0007) are isotropic or nearly isotropic and are due to the electrons trapped in the amorphous region formed by fission tracks or alpha-ray recoil nuclei. The h2 line (g = 2.0021) is a composite of several different lines. |
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