How is radiocarbon dating used
These newly formed 14C atoms rapidly oxidize to form 14CO..Photosynthesis incorporates 14C into plants and therefore animals that eat the plants.All radiocarbon ages are normalized to a 13C of -25‰ relative to PDB.Calibration In the 1950s it was observed that the radiocarbon timescale was not perfect.
From there it is incorporated into shell, corals and other marine organisms.
The main limitation of these techniques is sample size, as hundreds of grams of carbon are needed to count enough decaying beta particles.
This is especially true for old samples with low beta activity.
A unique characteristic of 14C is that it is constantly formed in the atmosphere.
Production and decay 14C atoms are produced in the upper atmosphere where neutrons from cosmic rays knock a proton from nitrogen-14 atoms.