From 10ad9576379a3f4acb3bedd455612961d9fcdb2c Mon Sep 17 00:00:00 2001 From: Paul Romano Date: Fri, 4 Dec 2015 22:04:13 -0600 Subject: [PATCH] Elaborate on description of units="sum" option for --- docs/source/usersguide/input.rst | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) diff --git a/docs/source/usersguide/input.rst b/docs/source/usersguide/input.rst index 0b132275bb..0ac71716bf 100644 --- a/docs/source/usersguide/input.rst +++ b/docs/source/usersguide/input.rst @@ -1110,13 +1110,14 @@ Each ``material`` element can have the following attributes or sub-elements: *Default*: "" - :density: - An element with attributes/sub-elements called ``value`` and ``units``. The - ``value`` attribute is the numeric value of the density while the ``units`` - can be "g/cm3", "kg/m3", "atom/b-cm", "atom/cm3", or "sum". The "sum" unit - indicates that the density should be calculated as the sum of the atom - fractions for each nuclide in the material. This should not be used in - conjunction with weight percents. + :density: An element with attributes/sub-elements called ``value`` and + ``units``. The ``value`` attribute is the numeric value of the density while + the ``units`` can be "g/cm3", "kg/m3", "atom/b-cm", "atom/cm3", or + "sum". The "sum" unit indicates that values appearing in ``ao`` attributes + for ```` and ```` sub-elements are to be interpreted as + nuclide/element densities in atom/b-cm, and the total density of the + material is taken as the sum of all nuclides/elements. The "sum" option + cannot be used in conjunction with weight percents. *Default*: None