: Paléoclimatologie: half-life

physical property > half-life

half-life

Half-life (symbol t1⁄2) is the time required for a quantity to reduce to half of its initial value. The term is commonly used in nuclear physics to describe how quickly unstable atoms undergo radioactive decay or how long stable atoms survive. Most nuclides are radioactive, meaning that they can emit particles transforming themselves into different nuclides. The half-life τ of a particular radionuclide is defined as the time where half of the initial radioactive nuclei disappears. The term is also used more generally to characterize any type of exponential or non-exponential decay. For example, the medical sciences refer to the biological half-life of drugs and other chemicals in the human body. The converse of half-life is doubling time. (Adapted from: https://en.wikipedia.org/wiki/Half-life and J.-J. Boreux et al. (1997). Palaeogeography, Palaeoclimatology, Palaeoecology, 128, 29-37.)

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