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Surface sediments now being deposited have a mean radiocarbon age of 2,500 years, but a completely satisfactory explanation for such an old age is still lacking.Protected PDF Document – A Protected Document provides both the reader and the publisher with maximum security and helps guard against unauthorized users.They provide a more precise way to examine radiocarbon ages of organic material for the entire 11,000-53,000-year time range.A new series of radiocarbon measurements from Japan's Lake Suigetsu will give scientists a more accurate benchmark for dating materials, especially for older objects, according to a research team that included Oxford University's Radiocarbon Accelerator Unit.The research team extracted cores of beautifully preserved layers of sediment, containing organic material (such as tree leaf and twig fossils), from the bottom of the Japanese lake where they had lain undisturbed for tens of thousands of years.As an article in the journal explains, the findings are hugely significant because they provide a much more precise way to examine radiocarbon ages of organic material for the entire 11,000-53,000-year time range.A series of radiocarbon measurements from Japan's Lake Suigetsu will give scientists a more accurate benchmark for dating materials, especially for older objects.

At the Oxford Radiocarbon Accelerator Unit, Professor Christopher Ramsey with his doctoral student Richard Staff and chemist Dr Fiona Brock worked with two other radiocarbon laboratories (the NERC facility at East Kilbride, Scotland, and Groningen in the Netherlands) on the radiocarbon record from the lake.

They were computed from ages based on total organic carbon.

Radiocarbon ages based on associated foraminiferal carbonate are commonly greater than ages of total organic carbon, a difference attributed to redeposition of foraminiferal tests onto the basin floors from surrounding higher areas.

However, upon death there is no further uptake of carbon and the 14C decays to 12N with a half life of 5730 years.

Measurement of the amount of C remaining in a dead organism will therefore give the date of its death.




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