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 This is the search engine version of the page, the full Physikon page can be found here:
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With energies smaller than the maximum energy, a neutrino takes over the energy difference

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http://www.physikon.com/physikon.cgi?gebiet=1&kapitel=40&seite=06 - Decay only occurs with artificial nuclides: This is the search engine version of the page, the full Physikon page can be found here:
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