Rehydroxylation (RHX) dating of archaeological pottery

Moira Wilson, Andrea Hamilton, Ceren Ince, Margaret Carter, Chris Hall

Research output: Contribution to journalArticlepeer-review


We show that the rehydroxylation (RHX) method can be used to date archaeological pottery, and give the first RHX dates for three disparate items of excavated material. These are in agreement with independently assigned dates. We define precisely the mass components of the ceramic material before, during and after dehydroxylation. These include the masses of three types of water present in the sample: capillary water, weakly chemisorbed molecular water and chemically combined RHX water. We describe the main steps of the RHX dating process: sample preparation, drying, conditioning, reheating and measurement of RHX mass gain. We propose a statistical criterion for isolating the RHX component of the measured mass gain data after reheating and demonstrate how to calculate the RHX age. An effective lifetime temperature (ELT) is defined, and we show how this is related to the temperature history of a sample. The ELT is used to adjust the RHX rate constant obtained at the measurement temperature to the effective lifetime value used in the RHX age calculation. Our results suggest that RHX has the potential to be a reliable and technically straightforward method of dating archaeological pottery, thus filling a long-standing gap in dating methods.
Original languageEnglish
Article number2147
Pages (from-to)3476-3493
Number of pages19
JournalProceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
Early online date12 Jul 2012
Publication statusPublished - 8 Nov 2012


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