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A high-precision date may involve the lab in more intensive pretreatment and labour and consequently costs are higher.

The variety in environment and post-depositional features is reflected in the variety and complexity of pretreatment procedures and the variety of different types of dateable material (see above).

There is more information about AMS Sample Preparation and pretreatment at the Oxford AMS lab and the Rafter Radiocarbon Lab.

The submitter should also describe the relationship between the material and the geological, or archaeological context to be dated.

Certain samples, especially shell, may show evidence of isotopic exchange or recrystallisation.