adjust.fractionation: Adjust a radiocarbon age for fractionation

In rice: Radiocarbon Equations

Adjust a radiocarbon age for fractionation

Description

Calculate the radiocarbon age by adjusting a sample's d13C to the reference d13C of -25 permil. It is planned to update this function to more properly reflect calculations in the 14CHRONO lab.

Usage

adjust.fractionation(y, d13C, reference_d13C = -25, realm = "C14")

Arguments

y	The age of the sample (in C14 by default, but can also be in F or pMC).
d13C	The measured d13C value.
reference_d13C	The reference/standard d13C value (OX2, oxalic acid 2, NIST SRM 4990C made from 1977 French beet molasses), set at -25 permil by default.
realm	Type of radiocarbon age. Can be in 'C14' (default), 'F14C' or 'pMC'.

Details

Radiocarbon ages are corrected for fractionation (which can take place in the field, or during lab pretreatment and measurement), by calculating the radiocarbon age as if the d13C fractionation were at the d13C of the standard (-25 permil). Errors are not taken into account.

Value

The fractionation-adjusted age.

Author(s)

Maarten Blaauw

Examples

  adjust.fractionation(5000, -17)

rice documentation built on June 13, 2025, 5:09 p.m.