TERMIUM Plus®

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HALF-LIFE PERIOD [3 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2015-10-06

English

Subject field(s)
  • Environmental Studies and Analyses
DEF

The period of time after which the concentration or mass of a substance, undergoing degradation or decay, has fallen to half of its initial value.

OBS

half-life period : term and definition standardized by ISO.

French

Domaine(s)
  • Études et analyses environnementales
DEF

Période de temps après laquelle la concentration ou la masse d'une substance, subissant une dégradation ou une désintégration, atteint la moitié de sa valeur initiale.

OBS

période de demi-vie : terme et définition normalisés par l'ISO.

Spanish

Campo(s) temático(s)
  • Estudios y análisis del medio ambiente
DEF

Período de tiempo después del cual la concentración o masa de una sustancia sometida a degradación o desintegración ha descendido a la mitad de su valor inicial.

OBS

El término es aplicable solamente a las reacciones de orden cero o uno.

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Record 2 2009-11-09

English

Subject field(s)
  • Nuclear Physics
  • Atomic Physics
CONT

The law of radioactive decay predicts how the number of the not decayed nuclei of a given radioactive substance decreases in the course of time.

OBS

The red circles of this simulation symbolize 1000 atomic nuclei of a radioactive substance whose half-life period(T) amounts to 20 seconds.

Key term(s)
  • radioactive decay law

French

Domaine(s)
  • Physique nucléaire
  • Physique atomique
CONT

Loi de décroissance radioactive. C'est en 1902 que Rutherford et Soddy ont mis en évidence la loi de décroissance exponentielle d'un corps radioactif. En effet, ils cherchaient à interpréter leurs expériences réalisées sur les éléments appartenant à la famille radioactive du thorium. C'est à Bateman (en 1910) que l'on doit l'établissement du formalisme général de résolution des équations régissant les filiations radioactives en fonction du temps [...]

Spanish

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Record 3 2008-11-21

English

Subject field(s)
  • Pharmacodynamics
CONT

The duration of action of a drug is known as its half life. This is the period of time required for the concentration or amount of drug in the body to be reduced by one-half. We usually consider the half life of a drug in relation to the amount of the drug in plasma. A drug's plasma half-life depends on how quickly the drug is eliminated from the plasma.

Key term(s)
  • plasma half life

French

Domaine(s)
  • Pharmacodynamie
DEF

[...] temps nécessaire pour que la concentration plasmatique [d'un médicament] diminue de moitié, par exemple de 100 à 50 mg/L.

Spanish

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