Updated some documentation.

docs/source/io_formats/nuclear_data.rst

@@ -179,7 +179,7 @@ Incident Photon Data
 
 **/<element>/stopping_powers/**
 
-:Datasets: - **density_effect** (*double[]*) -- Density effect parameter
+:Datasets: - **I** (*double*) -- Mean excitation energy in [eV]
            - **energy** (*double[]*) -- Energies in [eV]
            - **s_collision** (*double[]*) -- Collisiong stopping power in [eV-cm\ :sup:`2`\ /g]
            - **s_radiative** (*double[]*) -- Radiative stopping power in [eV-cm\ :sup:`2`\ /g]

docs/source/methods/photon_physics.rst

@@ -16,7 +16,10 @@ de-excitation of these atoms can result in the emission of electrons and
 photons. Electrons themselves also can produce photons by means of
 bremsstrahlung radiation.
 
-------------------------------
+-------------------
+Photon Interactions
+-------------------
+
 Coherent (Rayleigh) Scattering
 ------------------------------
 
@@ -56,7 +59,7 @@ accounts for `anomalous scattering`_ which can occur near absorption edges. In a
 Monte Carlo simulation, when coherent scattering occurs, we only need to sample
 the scattering angle using the differential cross section in :eq:`coherent-xs`
 since the energy of the photon does not change. In OpenMC, anomalous scattering
-is ignored such that differential cross section comes
+is ignored such that differential cross section becomes
 
 .. math::
     :label: coherent-xs-openmc
@@ -147,7 +150,6 @@ section. The complete algorithm is as follows:
 6. If :math:`\xi_2 < (1 + \mu^2)/2`, accept :math:`\mu`. Otherwise, repeat the
    sampling at step 3.
 
--------------------------------
 Incoherent (Compton) Scattering
 -------------------------------
 
@@ -207,24 +209,49 @@ the form factor. As in other codes, `Kahn's rejection method`_ is used for
    from step 1.
 
 Doppler Energy Broadening
--------------------------
++++++++++++++++++++++++++
 
 LA-UR-04-0487_ and LA-UR-04-0488_
 
---------------------
 Photoelectric Effect
 --------------------
 
+
+Pair Production
+---------------
+
+
+-------------------
+Secondary Processes
+-------------------
+
+New photons may be produced in secondary processes related to the main photon
+interactions discussed above. A Compton-scattered photon transfers a portion of
+its energy to the kinetic energy of the recoil electron, which in turn may lose
+the energy as bremsstrahlung radiation. The vacancy left in the shell by the
+ejected electron is filled through atomic relaxation, creating a shower of
+electrons and fluorescence photons. Similarly, the vacancy left by the electron
+emitted in the photoelectric effect is filled through atomic relaxation. Pair
+production generates an electron and a positron, both of which can emit
+bremsstrahlung radiation before the positron eventually collides with an
+electron, resulting in annihilation of the pair and the creation of two
+additional photons.
+
 Atomic Relaxation
 -----------------
 
----------------
-Pair Production
----------------
 
----------------------------
-Thick-target Bremsstrahlung
----------------------------
+Electron-Positron Annihilation
+------------------------------
+
+
+Bremsstrahlung
+--------------
+
+
+Thick-Target Bremsstrahlung Approximation
++++++++++++++++++++++++++++++++++++++++++
+
 
 .. _Koblinger: http://www.tandfonline.com/doi/abs/10.13182/NSE75-A26646
 

docs/source/pythonapi/base.rst

@@ -122,6 +122,7 @@ Constructing Tallies
    openmc.SpatialLegendreFilter
    openmc.SphericalHarmonicsFilter
    openmc.ZernikeFilter
+   openmc.ParticleFilter
    openmc.Mesh
    openmc.Trigger
    openmc.TallyDerivative

docs/source/usersguide/scripts.rst

@@ -166,12 +166,31 @@ ENDF/B-VII.1. It has the following optional arguments:
 ``openmc-get-nndc-data``
 ------------------------
 
-This script downloads `ENDF/B-VII.1 ACE data
-<http://www.nndc.bnl.gov/endf/b7.1/acefiles.html>`_ from NNDC and converts it to
-an HDF5 library for use with OpenMC. This script has the following optional
-arguments:
+This script downloads `ENDF/B-VII.1
+<http://www.nndc.bnl.gov/endf/b7.1/acefiles.html>`_ incident neutron ACE data
+and incident photon ENDF data from NNDC and converts it to an HDF5 library for
+use with OpenMC. This script has the following optional arguments:
 
--b, --batch     Suppress standard in
+-b, --batch
+    Suppress standard in
+
+-n, --neutron_only
+    Whether to exclude photon interaction/atomic data
+
+--------------------------
+``openmc-get-photon-data``
+--------------------------
+
+This script downloads `ENDF/B-VII.1 <http://www.nndc.bnl.gov/endf/b7.1/zips/>`_
+ENDF data from NNDC for photo-atomic and atomic relaxation sublibraries and
+converts it to an HDF5 library for use with photon transport in OpenMC. This
+script has the following optional arguments:
+
+-b, --batch
+    Suppress standard in
+
+-c, --cross-sections
+    cross_sections.xml file to append libraries to
 
 -----------------------
 ``openmc-make-compton``
@@ -182,6 +201,17 @@ Compton profile data using an existing data library from `Geant4
 <http://geant4.cern.ch/>`_. Note that OpenMC includes this data file by default
 so it should not be necessary in practice to generate it yourself.
 
+-------------------------------
+``openmc-make-stopping-powers``
+-------------------------------
+
+This script generates an HDF5 file called ``stopping_power.h5`` that contains
+radiative and collision stopping powers and mean excitation energy pulled from
+the `NIST ESTAR database
+<https://physics.nist.gov/PhysRefData/Star/Text/ESTAR.html>`_. Note that OpenMC
+includes this data file by default so it should not be necessary in practice to
+generate it yourself.
+
 .. _scripts_plot:
 
 --------------------------