Sources of error in radiometric dating
When an organism dies, it ceases to take in new carbon-14, and the existing isotope decays with its characteristic half-life (5730 years).The proportion of carbon-14 left when the remains of the organism are examined provides an indication of the time elapsed since its death.All the samples show loss of lead isotopes, but the intercept of the errorchron (straight line through the sample points) and the Concordia (curve) shows the correct age of the rock.
After plants die, or after they are consumed by other organisms, the 14C fraction of this organic material declines at a fixed exponential rate due to the radioactive decay of 14C.
He first demonstrated the accuracy of radiocarbon dating by accurately measuring the age of wood from an ancient Egyptian royal barge whose age was known from historical documents.
a- Basic Physics Atmospheric 14C, New Zealand and Austria.
The carbon–14 dating limits lie around 58,000 to 62,000 years.
The rate of creation of carbon-14 appears to be roughly constant, as cross-checks of carbon–14 dating with other dating methods show.