Half-life

Half-life

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.

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Part of Speech: noun
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Industry/Domain: Agricultural chemicals
Category: Pesticides
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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 ...

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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.

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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.

benchmark response (BMR)

Agricultural chemicals; Pesticides

A designated level or percent of response relative to the control level of response used in calculating a BMD.

best management practices (BMP)

Agricultural chemicals; Pesticides

Procedures or controls other than effluent limitations to prevent or reduce pollution of surface water (includes runoff control, spill prevention, and operating procedures).

BMD10

Agricultural chemicals; Pesticides

Benchmark Dose associated with a 10% response adjusted for background. For example, these BMD(10) values are doses expected to produce a 10% reduction in brain cholinesterase ...

comparative effect level (CEL)

Agricultural chemicals; Pesticides

Dose by which potency of chemicals may be compared; e.g. the dose causing a maximum of 15% cholinesterase inhibition.

confidential business information (CBI)

Agricultural chemicals; Pesticides

Information that contains trade secrets, commercial or financial information, or other information that has been claimed as confidential by the submitter.