ABSOLUTE. Electron Spin Resonance (ESR) - enables trapped electrons within bone and shell to be measured without heating that thermoluminescence requires. As with TL, the number of trapped electrons indicated the age of the specimen.* ESR is used to date teeth and tooth enamel. Works back 1,000,000 years (ca.)
*definations from Archeology: Theories, Methods, and Practice by Colin Refrew and Paul Bahn. © 2000
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