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Like berylium, the highly reactive lead is rapidly adsorbed to or incorporated on particulate material.
A half-life is defined as the time it takes for half a given number of atoms in a sample to decay to another element.
Short Lived Isotopes : 7 Be is formed in the atmosphere by the interaction of cosmic rays with nitrogen and oxygen, has a very short half-life (≈54 days).
It is a very reactive element and attaches instantaneously to particulate material.
This excess lead-210 provides the mechanism for age and depositional assessment.
(More : Understanding Lead-210 dating) Illustration of ideal excess lead 210 accumulation.