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This research ultimately led to the publication of the first set of radiocarbon dates in 1949.

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The sample is placed 1N HCl and heated to 80ºC for 1 hour, centrifuged and decanted.

The sample is then washed with 0.1 M Na OH to remove possible contamination by humic acids.

Turnaround time for rush samples is 7 business days.

Please call ahead for turnaround times for sample quantities exceeding 30, or for rush samples requiring a turnaround time shorter than 7 business days. The error is quoted as one standard deviation and reflects both statistical and experimental errors.

Standard deviations for full-size samples are typically ± 20–25 14C yr (0.1–0.25 p MC) for samples younger than 5,000 C yr.

To achieve greater precision, multiple measurements can be made on the same sample to calculate a weighted average and error.

Some common contaminants include intrusive rootlets, which are manually separated from the sample using forceps, and surface dirt.

Depending on the sample type, surface dirt may be removed by washing in an ultrasonic bath or by physically removing the outermost layer of the sample using a rotary tool or scalpel.

Libby and colleagues tested their method on known-age geological and archaeological materials.

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