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Added description of <element> to user's guide.

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Paul Romano 2013-02-08 16:51:59 -05:00
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docs/source/usersguide/input.rst
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@ -691,6 +691,26 @@ Each ``material`` element can have the following attributes or sub-elements:
*Default*: None
:element:
Specifies that a natural element is present in the material. The natural
element is split up into individual isotopes based on IUPAC Isotopic
Compositions of the Elements 1997. This element has attributes/sub-elements
called ``name``, ``xs``, and ``ao``. The ``name`` attribute is the atomic
symbol of the element while the ``xs`` attribute is the cross-section
identifier. Finally, the ``ao`` attribute specifies the atom percent of the
element within the material, respectively. One example would be as follows:
.. code-block:: xml
<element name="Al" ao="8.7115e-03" />
<element name="Mg" ao="1.5498e-04" />
<element name="Mn" ao="2.7426e-05" />
<element name="Cu" ao="1.6993e-04" />
*Default*: None
:sab:
Associates an S(a,b) table with the material. This element has
attributes/sub-elements called ``name`` and ``xs``. The ``name`` attribute