half-life definition

  • noun:
    • Physics the full time necessary for 1 / 2 the nuclei in a sample of a specific isotopic types to undergo radioactive decay.
    • Biology the full time needed for one half the number of a drug or any other substance deposited in a living organism to be metabolized or eliminated by regular biological procedures. Also referred to as biological half-life.
    • Biology enough time needed for the radioactivity of material drawn in by a full time income system is paid off to half its initial worth by a mixture of biological removal processes and radioactive decay.
    • The time needed for half the nuclei in an example of a particular isotope to undergo radioactive decay.
    • In a chemical effect, the time needed for the focus of a reactant to fall from a chosen value to half that price.
    • The time it takes for a substance (medication, radioactive nuclide, or other) to get rid of 1 / 2 of its pharmacological, physiologic, or radiological task.
    • enough time it will require for a notion or a fashion to lose 50 % of its important energy.
    • the full time it will take for one-half of a substance decaying in a first-order reaction to be damaged. For radioactive substances, it will be the time required for one-half associated with the preliminary amount of the radioactive isotope to decay. The half-lifeis a measure for the rate associated with the response being seen. For processes which can be true first-order procedures, such as for instance radioactive decay, the half-life is independent of the volume of product current, and it's also hence a consistent. The full time it takes for one-half the residual level of a radioactive isotope to decay will be the same regardless of how far the decay process features advanced level. Some chemical responses will also be first-order, that will be characterized as having a half-life. However, for chemical reactions the half-life depends upon temperature and perhaps other ecological circumstances, whereas for radioactive isotopes the price of decay is basically independent of the environment.
    • the time necessary for something to fall to half its initial value (specifically, enough time for one half the atoms in a radioactive compound to disintegrate)
    • enough time necessary for something to-fall to half its initial value (in particular, enough time for 1 / 2 the atoms in a radioactive material to disintegrate)

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