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Radiometric dating is self-checking, because the data (after certain preliminary calculations are made) are fitted to a straight line (an "isochron") by means of standard linear regression methods of statistics.

The slope of the line determines the date, and the closeness of fit is a measure of the statistical reliability of the resulting date.

This technique helps identify post-formation geologic disturbances because different minerals respond differently to heating and chemical changes.

The isochron techniques are partly based on this principle.

We scientists who measure isotope ages do not rely entirely on the error estimates and the self-checking features of age diagnostic diagrams to evaluate the accuracy of radiometric ages.

Whenever possible we design an age study to take advantage of other ways of checking the reliability of the age measurements.

Your application will be considered together with other applications.

The deadline for receiving applications each year is 30th November.The Community Archaeology Radiocarbon Dating (CARD) Fund was established and funded by Archaeological Research Services Ltd and the SUERC Radiocarbon dating laboratory in January 2016.The fund consists of a set number of radiocarbon dates available on an annual basis that community archaeology groups or projects can apply for. The fund is not open to universities, students, professional archaeological organisations or large charities.If your sample/s has been selected for CARD Fund support then in such cases where you have not yet had your material identified then we will ask you to send the material to Archaeological Research Services Ltd and we will assess the material and identify the most suitable sample for radiocarbon dating purposes.The CARD Fund operates via a web-based system to minimise the administrative burden and costs for both Archaeological Research Services Ltd and SUERC - this means more resource is available to plough into the fund and acquire new radiocarbon dates.The only way to apply is via the on-line application form on this web page. When the sample has been dated you will receive the dating certificate and calibrations via email from Archaeological Research Services Ltd.

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