TERMIUM Plus^®

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In positron lifetime measurements, individual lifetimes from several million annihilation events are collected to compose a so-called lifetime spectrum N([tau]), which is the derivative of the lifetime decay spectrum …  1, fiche 1, Anglais, - lifetime%20spectrum

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Lifetime measurement. The activity (in decays per second) of some radioactive samples varies in time in a particularly simple way. If the activity (R) in decays per second of a sample is proportional to the amount of radioactive material (R [alpha] N, where N is the number of radioactive nuclei), then the activity must decrease in time exponentially …  2, fiche 1, Anglais, - lifetime%20spectrum

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En mesure de temps de vie des positrons, représentation graphique des temps de vie résultant de plusieurs millions d’événements d’annihilation.  3, fiche 1, Français, - spectre%20de%20temps%20de%20vie

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Le spectre temps de vie résulte de la superposition des annihilations dans les différents états «i» qui sont accessibles.  2, fiche 1, Français, - spectre%20de%20temps%20de%20vie

Fiche 1,  Justifications,  Espagnol