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All radiocarbon samples listed here are taken on charcoal or ash and are conventional radiocarbon dates, unless otherwise stated.

The dates quoted are uncalibrated radiocarbon years BP.

Effective November 20, 2014, samples should be sent to the following address: Beta實驗室台北代理處 105台北市松山區敦化北路170號2樓A室 2/F-A, Hung Tai Centre, 170 Dunhua North Road, Songshan ... You only need to include the confirmation code in the packag​e​​.

Read More Published on November 3, 2014 Please be advised that our Miami radiocarbon lab and London forwarding facility will be closed during these periods (all dates inclusive): * Miami lab (USA) - November 27-30, 2014; December 24-28, 2014; and on January 1, 2015 * ...

Calibrated radiocarbon dates are presented using the 2-sigma values which account for 95.4% of the probability of the date falling within that particular range.

The prefix identifies the laboratory that processed the sample.

When radiocarbon dating was developed, it was assumed that the concentration of 14C in the atmosphere was constant over time.

However, we now know that it has varied over time, mostly because of changes in the earth's magnetic field.

The New Zealand numbers are part of the New Zealand Archaeological Association Site Recording Scheme.

Site numbers in the United States are based on the "Smithsonian Trinomial System" where each State has its own number (e.g., WA=45), the County within the state has a two letter abbreviation (e.g., Crook County = CR), and sites within the county are given numbers consecutively as they are found and recorded (i.e., 45xxnnn).

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