These two pieces of information are sufficient to completely identify the ion as C atoms at the rate at which they decay.

This requires sufficient atoms to be present to provide a large enough decay rate, as described above.

Please follow the guidelines described below: _____Never store material under conditions that might allow fungal or bacterial growth: If possible, try to keep samples frozen or dry.

To send samples to Keck-CCAMS at the UC Irvine for analysis, the following steps are required: Submitters, and in particular those making their first application, must make contact with the laboratory to discuss their requirements prior to actually submitting samples. A submission form plus a sample list provided must be filled out (see guidance document) for each group of samples submitted and sent to us via mail, fax or e-mail.

A hard copy of both must also accompany the samples. laboratory is currently equipped to handle routine processing of charcoal, wood, seed, carbonates, animal remains, etc.

For low-carbon organic material the carbon content can vary widely and no estimate for the preferred minimum sample size can be given.

Note that smaller sample sizes can be dated at a reduced precision. It is important to try to avoid storage and packing methodologies that may contaminate your sample.

However, it is up to the submitter to define and select the materials to be dated: for example, since you know your samples far better than we do, it’s your job to pick out the macrofossils or charcoal to be dated from within the sediment or peat matrix.

Specialized services such as pollen or foram picking or individual compound separation are not offered.Accelerator Mass Spectrometry (AMS) is a technique for measuring the concentrations of rare isotopes that cannot be detected with conventional mass spectrometers.The original, and best known, application of AMS is radiocarbon dating, where you are trying to detect the rare isotope A nuclear particle accelerator consists essentially of two linear accelerators joined end-to-end, with the join section (called the terminal) charged to a very high positive potential (3 million volts or higher). Injecting negatively charged carbon ions from the material being analysed into a nuclear particle accelerator based on the electrostatic tandem accelerator principle. The negative ions are accelerated towards the positive potential.Accelerating the ions to high energy has one more advantage.At the kinetic energies typically used in an AMS system it is possible to use well-established nuclear physics techniques to detect the individual C ions as they arrive at a suitable particle detector.C measurements in support of research into the carbon cycle and its links to climate.