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For further information, please find below a leaflet and two example reports for down load.One on sampling of live trees on the Ancient Oak at Lullingstone Park and one on dating a timber-frame building at The Rock Inn, Chiddingstone. We undertake both private and commercial commissions in dendrochronology throughout the UK: Most previous reports are available for purchase and these are listed on the Building page.The Tree-Ring Services web-site provides further information on our services and dendrochronology and dendroclimatology research. Some of our more recent reports are listed below: Buildings we date by dendrochronology are generally also published in Vernacular Architecture and summaries of the typographic features are available from the Building Archaeological Research Database (BARD).The half-life of potassium-40 is 1.3 billion years, far longer than that of carbon-14, allowing much older samples to be dated.
Thermoluminescence testing also dates items to the last time they were heated.
Techniques include tree rings in timbers, radiocarbon dating of wood or bones, and trapped-charge dating methods such as thermoluminescence dating of glazed ceramics.
Coins found in excavations may have their production date written on them, or there may be written records describing the coin and when it was used, allowing the site to be associated with a particular calendar year.
Carbon-14 moves up the food chain as animals eat plants and as predators eat other animals. It takes 5,730 years for half the carbon-14 to change to nitrogen; this is the half-life of carbon-14.
After another 5,730 years only one-quarter of the original carbon-14 will remain.
The development of accelerator mass spectrometry (AMS) dating, which allows a date to be obtained from a very small sample, has been very useful in this regard.