If it is the AMS δ13C, it cannot be used for dietary or metabolic pathway studies.
The correction factor must be added or subtracted from the conventional radiocarbon age.*****Beta Analytic’s fees already include δ13C measurements in conjunction with C14 analysis.
The lab also provides δ13C measurements NOT in conjunction with C14 analysis except for water samples.
In Liquid Scintillation Counting, for example, incomplete synthesis of acetylene during lithium carbide preparation may result in a low yield and concurrent fractionation.
Similarly, the transfer of gases in a vacuum system may involve fractionation error if the sample gas is not allowed to equilibrate throughout the total volume.
The Conventional Radiocarbon Age BP is calculated using the radiocarbon decay equationt=-8033 ln(Asn/Aon)Where -8033 represents the mean lifetime of 14C (Stuiver and Polach, 1977).
Aon is the activity in counts per minute of the modern standard, Asn is the equivalent cpm for the sample. A CRA embraces the following recommended conventions: About AMS Dating Accelerator Mass Spectrometry (AMS) dating involves accelerating ions to extraordinarily high kinetic energies followed by mass analysis.
Atoms of larger or smaller mass may be favored in such a situation.
If, however, the entire sample is converted completely from one form to another (e.g.
This value is representative of the sample itself and is reported. In comparison, reporting the “AMS δ13C” is misleading and open to misinterpretation.