What is radioactive balance

Radioactive balance

A decay series is a sequence of radioactive decays (A decays to B, B decays to C, ...)

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After a start-up period, a radioactive equilibrium is established: The activities of all nuclides in the series are the same:

This means:
  • a nuclide is created to the same extent as it decays
  • the longer the half-life, the greater the amount in the series
  • The decrease in the amount of the members of the series goes "parallel" with the decrease in the amount of the initial nuclide of the series


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If a decay series occurs, the following applies to a daughter nuclide:



 
= Activity of the mother nuclide
is equilibrium value

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Definition of half-life: = Time at which half of the atoms initially present have decayed

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Definition of activity:
= Number of decay acts per unit of time
1 Becquerell =
1 curie (Ci) = 3.7 1010

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With energies smaller than the maximum energy, a neutrino takes over the energy difference

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- Decay only occurs with artificial nuclides:


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