Half-life

Half-life

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

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Part of Speech: noun
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Industry/Domain: Astronomy
Category: Planetary science
Company: PSRD
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Related terms

half-life

Internet; Internet communication

A measurement for the amount of time a radioactive substance takes to lose half of its atoms. In technology, it refers to the amount of time that it takes for a storage device to ...

half-life

Energy; Nuclear energy

The time in which one half of the atoms of a particular radioactive substance disintegrate into another nuclear form. Measured half-lives vary from millionths of a second to ...

half-life

Natural environment; Coral reefs

The time required for a radioactive substance to lose half of its nuclei.

half-life

Medical devices; Radiology equipment

The time any substance takes to decay by half of its original amount. See also biological half-life, decay constant, effective half-life, radioactive half-life.

half-life

Printing & publishing; Publishing

The time it takes for a sensational news item to migrate from a front-page (qv) report to a back-page filler (qv), or for a spectacular entertainment to lose public interest; ...

half-life

Archaeology; 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.

evening star

Astronomy; Planetary science

A planet, not a star, that can be seen in the west just after sunset and it is usually Venus or Mercury.

simple sugar molecule

Astronomy; Planetary science

Also called glycolaldehyde, the simple sugar molecule is composed of carbon, hydrogen and oxygen and plays a key role in the chemical reaction that forms ribonucleic acid (RNA), a ...