For Half-life we have terms and definitions in 16 topics. The topics are Anthromorphemics, Anthropology, Archaeology, Electric Power, Energy, Environment, Environmental Toxins, Evolution, Finance, Geologic, HIV and AIDs, Nuclear, Nuclear Science, Physical Geography, Planetary Science and Science.

Half-life (Anthromorphemics)

The time taken for half the quantity of a radioactive isotope in a sample to decay (see also radioactive decay).

Half-life (Anthropology)

The time taken for half the quantity of a radioactive isotope in a sample to decay (see also radioactive decay).

Half-life (Archaeology)

The amount of timenecessary for one-half of a given mass of a radioactive isotope to decay into another element.

Half-life (Electric Power)

The period required for half of the atoms of a particular radioactive isotope to decay and become an isotope of another element.

Half-life (Energy)

The time it takes for an isotope to lose half of its radioactivity.

Half-life (Environment)

1. The time required for a pollutant to lose one-half of its original coconcentrationor example, the biochemical half-life of DDT in the environment is 15 years. 2. The time required for half of the atoms of a radioactive element to undergo self-transmutation or decay (half-life of radium is 1620 years). 3. The time required for the elimination of half a total dose from the body.

Half-life (Environmental Toxins)

The time required for a radioactive substance to lose 50 percent of its activity by decay. The half-life of the radioisotope plutonium-239, for example, is about 24,000 years. Starting with a pound of plutonium-239, in 24,000 years there will be one-half pound of plutonium-239, in another 23,000 years there will be one-fourth pound, and so on. (A pound of material remains, but it gradually becomes a stable element.)

Half-life (Evolution)

The amount of time it takes for one-half of the atoms of a radioactive material to decay to a stable form. For example, the half-life of carbon-14 is 5,568 years.

Half-life (Finance)

The point in the life of a mortgage-backed security guaranteed or issued by the Government National Mortgage Association, the Federal National Mortgage Association or the Federal Home Loan Mortgage Corporation when half the principal has been repaid.

Half-life (Geologic)

The time required for one-half of the atoms of a radioactive substance to decay.

Half-life (HIV and AIDs)

The time it takes for half of a drug dose to be eliminated from the bloodstream (or to be inactivated).

Half-life (Nuclear)

The time in which half the (large number of) atoms of a particular radioactive nuclide disintegrate. The half-life is a characteristic property of each radioactive isotope.

Half-life (Nuclear Science)

The time in which half the atoms of a particular radioactive nuclide disintegrate. The half-life is a characteristic property of each radioactive isotope.

Half-life (Physical Geography)

Time required for one half of the nuclei in a radioisotope to emit its radiation. Half-lifes for radioisotopes range from a few millionths of a second to several billion years.

Half-life (Planetary Science)

The amount of time required for half of the mass of a radioactive isotope to decay.

Half-life (Science)

The time needed for the atoms of a parent radioisotope to decay to one-half their original number.

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