Published online by Cambridge University Press: 17 December 2021
An obvious feature of the presence of radionuclides in the environment, regardless of their origin, is that their different rates of decay have the potential to estimate the time elapsed since certain events or processes took place. Thus they could be used in a sequential manner, using ratios of parent and daughter radionuclides at different points in time, or in a parallel manner, by comparing the ratios of two or more radionuclides of the same element over time. And the passage of time itself as estimated using radionuclides could in turn be theoretically used in various contexts, such as time before the present, the time that had elapsed between two events (such as birth and death) at some previous period in time, or the time elapsed to indicate the rate at which a specific process takes place. So to what extent do such possibilities exist in a practical sense?
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