Start Range of carbon dating

Range of carbon dating

If a sample age falls after 1950, it is termed greater than Modern, or Where Aabs is the absolute international standard activity, 1/8267 is the lifetime based on the new half life (5730 yr), Y = the year of measurement of the appropriate standard.

All D14C values are normalized to the base value of -25.0 per mille with respect to the standard carbonate (VPDB).

D14C is calculated using: Figure 1: Decay curve for C14 showing the activity at one half-life (t/2).

Obviously, the limit of the method differs between laboratories dependent upon the extent to which background levels of radioactivity can be reduced.