Card 9: Calculation region details for region-wise geometries
-------------------------------------------------------------

.. _`param:iregon`:

.. rst-class:: no-caption-number

.. list-table:: **IREGON** :phits-other:`PHITS: other means`
   :header-rows: 0

   * - Value
     - Description
   * - (D=1)
     - Number of calculation regions.

**Card 9a: Region information listings**

This card’s following legacy entries have been deprecated: ``MCNPTALS``, ``MCNPCELS``, ``MCNPVOLS``, ``MCNPMATS``

Each of the following 6 entries must be listed on a single line, separated by any nonzero number of spaces, and this card (including Card 9b) must be repeated ``IREGON`` times.

.. _`param:hrgcmm`:

.. rst-class:: no-caption-number

.. list-table:: **HRGCMM** :phits-not-settable:`PHITS: not settable`
   :header-rows: 0

   * - Value
     - Description
   * -
     - String of length :math:`\leq` 10 with no spaces used to describe each region.

.. _`param:iregs`:

.. rst-class:: no-caption-number

.. list-table:: **IREGS** :phits-not-settable:`PHITS: not settable`
   :header-rows: 0

   * - Value
     - Description
   * - (D\ :sub:`P`\ =\ :math:`n`)
     - Region identification number.
   * - = 0
     - All regions are considered in the calculation.
   * - = :math:`n` (:math:`>`\ 0)
     - Each region :math:`n` is considered separately in the calculation.
   * - = -1
     - The regionwise nuclide yield file is ignored.

.. _`param:itgncls`:

.. rst-class:: no-caption-number

.. list-table:: **ITGNCLS** :phits-other:`PHITS: other means`
   :header-rows: 0

   * - Value
     - Description
   * -
     - Number of nuclides in the target material, detailed in Card 9b.

.. _`param:fluxs-regionwise`:

.. rst-class:: no-caption-number

.. list-table:: **FLUXS** :phits-not-settable:`PHITS: not settable`
   :header-rows: 0

   * - Value
     - Description
   * - (D=0.0, D\ :sub:`P`\ = automatically calculated [#]_, requires ``JMODE``\ =1,2)
     - Total neutron flux below 20 MeV in [n/(cm\ :math:`^2`\ :math:`\cdot`\ sec)].

.. _`param:hnfluxs`:

.. rst-class:: no-caption-number

.. list-table:: **HNFLUXS** :phits-not-settable:`PHITS: not settable`
   :header-rows: 0

   * - Value
     - Description
   * -
     - File name (string) of the neutron flux file (must be :math:`\leq` 40 characters); ignored if set to ‘``no``’ or ‘``NO``’ (for standalone calculations without PHITS).

.. _`param:volumes`:

.. rst-class:: no-caption-number

.. list-table:: **VOLUMES** :phits-not-settable:`PHITS: not settable`
   :header-rows: 0

   * - Value
     - Description
   * - (D=1.0, D\ :sub:`P`\ =taken from [Volume] section in PHITS, if defined)
     - Volume of the target region in [cm\ :math:`^3`].

.. _c9b:

**Card 9b: Material isotopic composition listings**

Each of the following 2 entries must be listed on a single line, separated by any nonzero number of spaces, and this sequence must be repeated ``ITGNCLS`` times on ``ITGNCLS`` lines.

.. _`param:tgnzas`:

.. rst-class:: no-caption-number

.. list-table:: **TGNZAS** :phits-other:`PHITS: other means`
   :header-rows: 0

   * - Value
     - Description
   * -
     - The nuclide identification number, calculated as :math:`1000\cdot Z+A+0.1\cdot M` where :math:`Z` is the atomic (proton) number, :math:`A` is the mass number, and :math:`M` is the isomeric/metastable state (0=ground, 1=1\ :math:`^{st}` metastable state, etc.). An element in its natural abundances is entered using :math:`A=0` and :math:`M=0`.
   * - Au-197m
     - :math:`\rightarrow` 79197.1
   * - Fe-56
     - :math:`\rightarrow` 26056.0
   * - Cr
     - :math:`\rightarrow` 24000.0

.. _`param:htgnzas`:

.. rst-class:: no-caption-number

.. list-table:: **HTGNZAS** :phits-other:`PHITS: other means`
   :header-rows: 0

   * - Value
     - Description
   * -
     - The nuclide identification string. It is structured as the elemental symbol (1 or 2 characters), a connecting hyphen (-), the atomic number, and a single character denoting the isomeric/metastable state, all with no spaces. The ground, first, and second isomeric states are denoted with the characters ‘g’, ‘m’, and ‘n’ respectively; omission of the isomeric state assumes ground state. An elemental symbol used alone implies use of its natural isotopic abundances.
   * - Examples
     - Au-197m, Fe-56, W-185g, Fe, Cr

:math:`^*`\ Only one of these two values should be provided to identify each nuclide/element.

.. _`param:tgnnds`:

.. rst-class:: no-caption-number

.. list-table:: **TGNNDS** :phits-other:`PHITS: other means`
   :header-rows: 0

   * - Value
     - Description
   * -
     - Atomic number density of the target nuclide/element.
   * - :math:`>` 0
     - Atomic number density of nuclide/element in [10\ :math:`^{24}` atoms/cm\ :math:`^3`].
   * - :math:`<` 0
     - Mass density in [g/cm\ :math:`^3`] of the element [#]_ specified in (``H``)\ ``TGNZAS``.
   * - = -999
     - The element’s density at room temperature is used.

.. [#]
   PHITS calculates ``FLUXS`` as ``amp`` (in source/sec, from [T-Dchain] input parameters) times the region’s total neutron flux (in n/(source\ \ :math:`\cdot`\ \ cm\ \ :math:`^2`) as determined by the automatically generated [T-Track] tally).

.. [#]
   Note that negative values only work for natural elements listed (no mass number :math:`A` specified).