.. _[t-dpa]:

[ T-DPA ] section
==================================================

This tally gives the displacement per atom, DPA, value, or number of displaced atoms per target atom, which represents radiation damage in materials irradiated by energetic particles.
The result produced by this tally includes the contribution of the Coulomb scattering cross section for charged particle transportation.
The DPA for low-energy neutron-induced reactions can also be obtained using **e-mode>=1**.
Note that the sum-over value is not output from **[t-dpa]**.

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.. list-table:: **mesh**
   :header-rows: 0

   * - value
     - explanation
   * - **reg, r-z, xyz, tet**
     - Mesh type.
       A mesh type subsection is required below this option.

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.. list-table:: **unit**
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   * - value
     - explanation
   * - **1, 2**
     - 1: DPA [x1.E-24/source]
       2: DPA [1/source]

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.. list-table:: **idpa**
   :header-rows: 0

   * - value
     - explanation
   * - (optional, D=0)
     - 0: dpa without athermal recombination correction, NRT-dpa.
       1: dpa with athermal recombination correction, arc-dpa.

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.. list-table:: **axis**
   :header-rows: 0

   * - value
     - explanation
   * - **reg, x, y, z, r**
     - x axis value of output data.
   * - **tet**
     - x axis value of output data, only active with **mesh=tet**.
   * - **xy, yz, xz, rz**
     - 2-dimensional.

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.. list-table:: **output**
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   * - value
     - explanation
   * - **dpa**
     - Total DPA value.

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.. list-table:: **mother**
   :header-rows: 0

   * - value
     - explanation
   * - (optional)
     - Specify mother nuclei for contributing to DPA.
   * - **all**
     - **all** is the default, same as no definition.
   * - number of mother nuclei
     - When setting the number of mother nuclei, define the mothers in the next line.
       The number of **mother** can be set as a negative value, in which case the specified mothers are not included for scoring.
       Note that this parameter is effective only for dose calculations using the kerma approximation for neutrons and photons because energy deposition from charged particles cannot be distinguished to each mother nucleus.
   * - (next line)
     - **208Pb Pb**
       Nucleus if specified using mass.
       Without mass, all nuclei are isotopes of Pb.
       To specify multiple mother groups, use multiple **[t-dpa]** tallies.

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