Abstract
We have studied the ESR spectrum of enamel from fossil vertebrate teeth <5 Ma old. Single fragments (10–50 mg), where hydroxyapatite prisms show a good alignment, behave as a quasi-oriented system, allowing angular variation studies. From measurements made at 9.5 and 35 GHz, we find that in the g = 2.00 region of the ESR spectrum, the asymmetric main signal is attributable to the superposition of lines from two paramagnetic species: species A, presenting an axial symmetry, with g⊥ = 2.0026 and g‖ = 1.9975; and species B, having an orthorhombic symmetry with g1 = 2.0032, g2 = 2.0018 and g3 = 1.9975. Centre A is probably located at an OH- site of the hydroxyapatite lattice. Centre B could be a distorted centre A.
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Schedule a callMore From: International Journal of Radiation Applications and Instrumentation. Part D. Nuclear Tracks and Radiation Measurements
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