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The calculations to be performed on the measurements taken depend on the technology used, since beta counters measure the sample's radioactivity, whereas accelerator mass spectrometers (AMS) determine the ratio of the three different carbon isotopes in the sample.Another standard is the use of 1950 as "present", in the sense that a calculation that shows that a sample's likely age is 500 years "before present" means that it is likely to have come from about the year 1450.Twenty cores were recovered successfully; three of these had extra sediment from the core catcher or cutting head, which was transferred to bags (fig. Seven additional sites yielded only samples from the core catcher or cutting head, which were also put in bags.

Modern methods in mass spectrometry, far advanced since their development in the 1970s, now enable carbon dating to be applied to a wide range of new problems.

Detailed processing descriptions and sample information for each data type are provided in the metadata files for each data layer described in the Data Catalog section of this report.

The Data Catalog offers comprehensive explanations, download instructions, and metadata for data products associated with this report.

The WHOI giant gravity corer was used to collect cores during cruise SJ8 (fig. The gravity corer is a large-diameter (10-centimeter [cm]) sampler that collects cores up to 6.5 meters (m) in length.

During this cruise, the corer was rigged to collect approximately 3-m-long cores.