EPR dating CO2- sites in tooth enamel apatites by ENDOR and triple resonance

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
N V VugmanS E Rigby

Abstract

In this work we combine electron paramagnetic resonance (EPR), high-resolution electron nucleus double resonance (ENDOR) and general triple resonance (GTR) spectroscopies, to study the local environment of the CO2- groups created by ionizing radiation in fossil tooth enamel. We demonstrate that the CO2- groups occupy slightly modified phosphate sites in the hydroxyapatite lattice. In quaternary shark enamel we found these groups to be interacting with water molecules in the apatite channels. The absence of water molecules as first neighbors in mammalian samples indicate, however, that these molecules are not significantly responsible for the stabilization of CO2- dating centers in enamel.

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Citations

Jun 3, 2000·Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine·L M OliveiraR T Lopes
Aug 23, 2001·Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine·D AragnoS Onori
Jul 10, 2002·Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine·S S IshchenkoN P Baran
Jan 13, 2010·Health Physics·Luiz Carlos OliveiraOswaldo Baffa
Sep 29, 2000·Physics in Medicine and Biology·D AragnoS Onori
Jul 6, 2010·Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine·Paola Fattibene, Freddy Callens

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