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Record 1 2011-12-21


Subject field(s)
  • Radiological Physics (Theory and Application)
  • Electromagnetic Radiation

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 …


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 …

Key term(s)
  • life time spectrum
  • life-time spectrum


  • Physique radiologique et applications
  • Rayonnements électromagnétiques

En mesure de temps de vie des positrons, représentation graphique des temps de vie résultant de plusieurs millions d’événements d’annihilation.


Le spectre temps de vie résulte de la superposition des annihilations dans les différents états «i» qui sont accessibles.


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