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====== Half life parameter ======

The half life parameter contains the half life times of the radionuclides that have been added to the project. It is only available with the [[Radionuclide_toolbox|radionuclide toolbox]].

The parameter is always dependent on [[Index_list|radionuclides]] and will be synchronized with the radionuclides so that if you change the half life directly in a radionuclide, the value will change in the half life parameter and vice versa.

With this parameter you have access to the half life in your equations, which is useful if you wish to convert between Mol and Bq. As with any other parameter, you can access radionuclide specific values by using brackets; eg. halfLife[Cs-137].

===== Creating the half life parameter =====

The half life parameter is created automatically when the first [[Radionuclide|radionuclide]] is added to the project and is given the name //halfLife//.

If you have removed the parameter and want to re-create it, or if you have opened a project in which there is no half life parameter:

  - Open the [[Materials_window|Materials window]].
  - Right-click the table and select **Create** > **Half life parameter** from the menu.2

===== See also =====

  * [[Materials_window|Materials window]]

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