This diagrammatic representation of the decay of lead-210 over time shows that the activity is reduced to half at about 22 years. This trend continues to approach an activity of zero (or supported levels) in an exponential manner. It is this decrease in lead-210 activity that is a measure of age as activity approaches the asymptote (a line whose distance to a given curve tends to zero). Image courtesy of A. Andrews/MLML.
Related Links
Davidson Seamount: Exploring Ancient Coral Gardens
Davidson Seamount: Exploring Ancient Coral Gardens — Coral Ageing
