diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 321f188744..687753963f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -124,7 +124,9 @@ jobs:
 
       - name: test
         shell: bash
-        run: $GITHUB_WORKSPACE/tools/ci/gha-script.sh
+        run: |
+          CTEST_OUTPUT_ON_FAILURE=1 make test -C $GITHUB_WORKSPACE/build/
+          $GITHUB_WORKSPACE/tools/ci/gha-script.sh
 
       - name: after_success
         shell: bash
diff --git a/.gitmodules b/.gitmodules
index ff91200103..4dde5fd5ee 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -13,3 +13,6 @@
 [submodule "vendor/fmt"]
 	path = vendor/fmt
 	url = https://github.com/fmtlib/fmt.git
+[submodule "vendor/Catch2"]
+	path = vendor/Catch2
+	url = https://github.com/catchorg/Catch2.git
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4737ff47b2..11ae71ac65 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -31,6 +31,7 @@ endif()
 #===============================================================================
 
 option(OPENMC_USE_OPENMP      "Enable shared-memory parallelism with OpenMP"         ON)
+option(OPENMC_BUILD_TESTS     "Build tests"                                          ON)
 option(OPENMC_ENABLE_PROFILE  "Compile with profiling flags"                         OFF)
 option(OPENMC_ENABLE_COVERAGE "Compile with coverage analysis flags"                 OFF)
 option(OPENMC_USE_DAGMC       "Enable support for DAGMC (CAD) geometry"              OFF)
@@ -285,6 +286,17 @@ if (NOT gsl-lite_FOUND)
   target_compile_definitions(gsl-lite-v1 INTERFACE gsl_CONFIG_ALLOWS_NONSTRICT_SPAN_COMPARISON=1)
 endif()
 
+#===============================================================================
+# Catch2 library
+#===============================================================================
+
+if(OPENMC_BUILD_TESTS)
+  find_package_write_status(Catch2)
+  if (NOT Catch2)
+    add_subdirectory(vendor/Catch2)
+  endif()
+endif()
+
 #===============================================================================
 # RPATH information
 #===============================================================================
@@ -504,6 +516,12 @@ if (OPENMC_USE_MPI)
   target_link_libraries(libopenmc MPI::MPI_CXX)
 endif()
 
+if (OPENMC_BUILD_TESTS)
+  # Add cpp tests directory
+  include(CTest)
+  add_subdirectory(tests/cpp_unit_tests)
+endif()
+
 if (OPENMC_USE_MCPL)
   target_compile_definitions(libopenmc PUBLIC OPENMC_MCPL)
   target_link_libraries(libopenmc MCPL::mcpl)
diff --git a/docs/source/devguide/tests.rst b/docs/source/devguide/tests.rst
index 922f47eb31..d076511b1d 100644
--- a/docs/source/devguide/tests.rst
+++ b/docs/source/devguide/tests.rst
@@ -45,7 +45,7 @@ Prerequisites
 Running Tests
 -------------
 
-To execute the test suite, go to the ``tests/`` directory and run::
+To execute the Python test suite, go to the ``tests/`` directory and run::
 
     pytest
 
@@ -55,6 +55,14 @@ installed and run::
 
     pytest --cov=../openmc --cov-report=html
 
+To execute the C++ test suite, go to your build directory and run::
+
+    ctest
+
+If you want to view testing output on failure run::
+
+    ctest --output-on-failure
+
 Generating XML Inputs
 ---------------------
 
@@ -66,6 +74,23 @@ run::
 
     pytest --build-inputs <name-of-test>
 
+Adding C++ Unit Tests
+---------------------
+
+The C++ test suite uses Catch2 integrated with CTest. Each header file should
+have a corresponding test file in ``tests/cpp_unit_tests/``. If the test file
+does not exist run::
+
+    touch test_<name-of-header-file>.cpp
+
+The file must be added to the CMake build system in 
+``tests/cpp_unit_tests/CMakeLists.txt``. ``test_<name-of-header-file>`` should 
+be added to ``TEST_NAMES``. 
+
+To add a test case to ``test_<name-of-header-file>.cpp`` ensure 
+``catch2/catch_test_macros.hpp`` is included. A unit test can then be added 
+using the ``TEST_CASE`` macro and the ``REQUIRE`` assertion from Catch2. 
+
 Adding Tests to the Regression Suite
 ------------------------------------
 
diff --git a/include/openmc/distribution.h b/include/openmc/distribution.h
index d3fe958caa..4fc0db2e09 100644
--- a/include/openmc/distribution.h
+++ b/include/openmc/distribution.h
@@ -47,14 +47,20 @@ public:
 
   // Properties
   const vector<double>& x() const { return x_; }
-  const vector<double>& p() const { return p_; }
+  const vector<double>& prob() const { return prob_; }
+  const vector<size_t>& alias() const { return alias_; }
 
 private:
-  vector<double> x_; //!< Possible outcomes
-  vector<double> p_; //!< Probability of each outcome
+  vector<double> x_;    //!< Possible outcomes
+  vector<double> prob_; //!< Probability of accepting the uniformly sampled bin,
+                        //!< mapped to alias method table
+  vector<size_t> alias_; //!< Alias table
 
   //! Normalize distribution so that probabilities sum to unity
   void normalize();
+
+  //! Initialize alias tables for distribution
+  void init_alias(vector<double>& x, vector<double>& p);
 };
 
 //==============================================================================
diff --git a/src/distribution.cpp b/src/distribution.cpp
index fc0297fec2..4b4ebd69d7 100644
--- a/src/distribution.cpp
+++ b/src/distribution.cpp
@@ -1,6 +1,7 @@
 #include "openmc/distribution.h"
 
 #include <algorithm> // for copy
+#include <array>
 #include <cmath>     // for sqrt, floor, max
 #include <iterator>  // for back_inserter
 #include <numeric>   // for accumulate
@@ -26,30 +27,76 @@ Discrete::Discrete(pugi::xml_node node)
   auto params = get_node_array<double>(node, "parameters");
 
   std::size_t n = params.size();
-  std::copy(params.begin(), params.begin() + n / 2, std::back_inserter(x_));
-  std::copy(params.begin() + n / 2, params.end(), std::back_inserter(p_));
+  std::vector<double> x_vec(params.begin(), params.begin() + n / 2);
+  std::vector<double> p_vec(params.begin() + n / 2, params.end());
 
-  normalize();
+  this->init_alias(x_vec, p_vec);
 }
 
 Discrete::Discrete(const double* x, const double* p, int n)
-  : x_ {x, x + n}, p_ {p, p + n}
 {
+  std::vector<double> x_vec(x, x + n);
+  std::vector<double> p_vec(p, p + n);
+
+  this->init_alias(x_vec, p_vec);
+}
+
+void Discrete::init_alias(vector<double>& x, vector<double>& p)
+{
+  x_ = x;
+  prob_ = p;
   normalize();
+
+  // The initialization and sampling method is based on Vose
+  // (DOI: 10.1109/32.92917)
+  // Vectors for large and small probabilities based on 1/n
+  vector<size_t> large;
+  vector<size_t> small;
+
+  // Set and allocate memory
+  vector<size_t> alias(x_.size(), 0);
+  alias_ = alias;
+
+  // Fill large and small vectors based on 1/n
+  for (size_t i = 0; i < x_.size(); i++) {
+    prob_[i] *= x_.size();
+    if (prob_[i] > 1.0) {
+      large.push_back(i);
+    } else {
+      small.push_back(i);
+    }
+  }
+
+  while (!large.empty() && !small.empty()) {
+    int j = small.back();
+    int k = large.back();
+
+    // Remove last element of small
+    small.pop_back();
+
+    // Update probability and alias based on Vose's algorithm
+    prob_[k] += prob_[j] - 1.0;
+    alias_[j] = k;
+
+    // Move large index to small vector, if it is no longer large
+    if (prob_[k] < 1.0) {
+      small.push_back(k);
+      large.pop_back();
+    }
+  }
 }
 
 double Discrete::sample(uint64_t* seed) const
 {
+  // Alias sampling of discrete distribution
   int n = x_.size();
   if (n > 1) {
-    double xi = prn(seed);
-    double c = 0.0;
-    for (int i = 0; i < n; ++i) {
-      c += p_[i];
-      if (xi < c)
-        return x_[i];
+    int u = prn(seed) * n;
+    if (prn(seed) < prob_[u]) {
+      return x_[u];
+    } else {
+      return x_[alias_[u]];
     }
-    throw std::runtime_error {"Error when sampling probability mass function."};
   } else {
     return x_[0];
   }
@@ -58,8 +105,8 @@ double Discrete::sample(uint64_t* seed) const
 void Discrete::normalize()
 {
   // Renormalize density function so that it sums to unity
-  double norm = std::accumulate(p_.begin(), p_.end(), 0.0);
-  for (auto& p_i : p_) {
+  double norm = std::accumulate(prob_.begin(), prob_.end(), 0.0);
+  for (auto& p_i : prob_) {
     p_i /= norm;
   }
 }
diff --git a/tests/cpp_unit_tests/CMakeLists.txt b/tests/cpp_unit_tests/CMakeLists.txt
new file mode 100644
index 0000000000..3d48545b4c
--- /dev/null
+++ b/tests/cpp_unit_tests/CMakeLists.txt
@@ -0,0 +1,10 @@
+set(TEST_NAMES
+  test_distribution
+  # Add additional unit test files here
+)
+
+foreach(test ${TEST_NAMES})
+  add_executable(${test} ${test}.cpp)
+  target_link_libraries(${test} Catch2::Catch2WithMain libopenmc)
+  add_test(NAME ${test} COMMAND ${test} WORKING_DIRECTORY ${UNIT_TEST_BIN_OUTPUT_DIR})
+endforeach()
diff --git a/tests/cpp_unit_tests/test_distribution.cpp b/tests/cpp_unit_tests/test_distribution.cpp
new file mode 100644
index 0000000000..e1a212db55
--- /dev/null
+++ b/tests/cpp_unit_tests/test_distribution.cpp
@@ -0,0 +1,81 @@
+#include "openmc/distribution.h"
+#include "openmc/random_lcg.h"
+#include <catch2/catch_test_macros.hpp>
+#include <catch2/matchers/catch_matchers_floating_point.hpp>
+#include <cmath>
+#include <pugixml.hpp>
+
+TEST_CASE("Test alias method sampling of a discrete distribution")
+{
+  constexpr int n_samples = 1000000;
+  double x[5] = {-1.6, 1.1, 20.3, 4.7, 0.9};
+  double p[5] = {0.2, 0.1, 0.65, 0.02, 0.03};
+
+  // Initialize distribution
+  openmc::Discrete dist(x, p, 5);
+  uint64_t seed = openmc::init_seed(0, 0);
+
+  // Calculate expected distribution mean
+  double mean = 0.0;
+  for (size_t i = 0; i < 5; i++) {
+    mean += x[i] * p[i];
+  }
+
+  // Sample distribution and calculate mean, standard deviation, and number of
+  // x[0] sampled
+  double dist_mean = 0.0;
+  double std = 0.0;
+  int counter = 0;
+
+  for (size_t i = 0; i < n_samples; i++) {
+    auto sample = dist.sample(&seed);
+    std += sample * sample / n_samples;
+    dist_mean += sample;
+
+    if (sample == x[0])
+      counter++;
+  }
+
+  dist_mean /= n_samples;
+  std -= dist_mean * dist_mean;
+
+  // Require sampled distribution mean is within 4 standard deviations of the
+  // expected mean
+  REQUIRE(std::abs(dist_mean - mean) < 4 * std);
+
+  // Require counter of number of x[0] is within the 95% confidence interval
+  // assuming a Poisson distribution of 200,000
+  REQUIRE(std::abs((double)counter / n_samples - p[0]) <
+          1.96 * std::sqrt(p[0] / n_samples));
+}
+
+TEST_CASE("Test alias sampling method for pugixml constructor")
+{
+  // XML doc node for Discrete contructor
+  pugi::xml_document doc;
+  pugi::xml_node energy = doc.append_child("energy");
+  pugi::xml_node parameters = energy.append_child("parameters");
+  parameters.append_child(pugi::node_pcdata)
+    .set_value("800 500000 30000 0.1 0.6 0.3");
+
+  // Initialize discrete distribution and seed
+  openmc::Discrete dist(energy);
+  uint64_t seed = openmc::init_seed(0, 0);
+  auto sample = dist.sample(&seed);
+
+  // Assertions
+  REQUIRE(dist.x().size() == 3);
+  REQUIRE(dist.prob().size() == 3);
+  REQUIRE(dist.alias().size() == 3);
+
+  openmc::vector<double> correct_x = {800, 500000, 30000};
+  openmc::vector<double> correct_prob = {0.3, 1.0, 0.9};
+  openmc::vector<size_t> correct_alias = {1, 0, 1};
+
+  for (size_t i = 0; i < 3; i++) {
+    REQUIRE(dist.x()[i] == correct_x[i]);
+    REQUIRE_THAT(
+      dist.prob()[i], Catch::Matchers::WithinAbs(correct_prob[i], 1e-12));
+    REQUIRE(dist.alias()[i] == correct_alias[i]);
+  }
+}
diff --git a/tests/regression_tests/deplete_with_transport/last_step_reference_materials.xml b/tests/regression_tests/deplete_with_transport/last_step_reference_materials.xml
index fc9fd0cf5b..b818566837 100644
--- a/tests/regression_tests/deplete_with_transport/last_step_reference_materials.xml
+++ b/tests/regression_tests/deplete_with_transport/last_step_reference_materials.xml
@@ -4,43 +4,43 @@
     <density units="sum" />
     <nuclide ao="0.046295399999999994" name="O16" />
     <nuclide ao="0.00011276839999999999" name="O17" />
-    <nuclide ao="4.624897827397648e-07" name="Cs135" />
+    <nuclide ao="4.62489782739765e-07" name="Cs135" />
     <nuclide ao="8.513845108222934e-09" name="Gd156" />
-    <nuclide ao="3.6422790646859426e-10" name="Gd157" />
+    <nuclide ao="3.6422790646859405e-10" name="Gd157" />
     <nuclide ao="1.2506256160444458e-08" name="I135" />
     <nuclide ao="1.0044833338996991e-05" name="U234" />
     <nuclide ao="0.0010135760878333647" name="U235" />
     <nuclide ao="0.022134354214267578" name="U238" />
     <nuclide ao="6.021515908249729e-09" name="Xe135" />
-    <nuclide ao="1.894526271330101e-06" name="Xe136" />
+    <nuclide ao="1.8945262713301022e-06" name="Xe136" />
   </material>
   <material depletable="true" id="2" temperature="293.6" volume="0.06674732823364922">
     <density units="sum" />
     <nuclide ao="0.046295399999999994" name="O16" />
     <nuclide ao="0.00011276839999999999" name="O17" />
-    <nuclide ao="4.1317192551597174e-07" name="Cs135" />
+    <nuclide ao="4.1317192551597164e-07" name="Cs135" />
     <nuclide ao="7.1951197683939435e-09" name="Gd156" />
-    <nuclide ao="4.554662978016358e-10" name="Gd157" />
+    <nuclide ao="4.554662978016352e-10" name="Gd157" />
     <nuclide ao="9.143600937356816e-09" name="I135" />
     <nuclide ao="1.004460107410099e-05" name="U234" />
     <nuclide ao="0.0010219836045364463" name="U235" />
     <nuclide ao="0.022134432003405754" name="U238" />
-    <nuclide ao="4.8818754167757864e-09" name="Xe135" />
-    <nuclide ao="1.4950302645958768e-06" name="Xe136" />
+    <nuclide ao="4.881875416775785e-09" name="Xe135" />
+    <nuclide ao="1.4950302645958752e-06" name="Xe136" />
   </material>
   <material depletable="true" id="3" temperature="293.6" volume="0.06674732823364922">
     <density units="sum" />
     <nuclide ao="0.046295399999999994" name="O16" />
     <nuclide ao="0.00011276839999999999" name="O17" />
-    <nuclide ao="4.423302326792641e-07" name="Cs135" />
+    <nuclide ao="4.4233023267926427e-07" name="Cs135" />
     <nuclide ao="7.650057506928347e-09" name="Gd156" />
     <nuclide ao="4.381381122619264e-10" name="Gd157" />
-    <nuclide ao="1.1144702868821655e-08" name="I135" />
+    <nuclide ao="1.1144702868821656e-08" name="I135" />
     <nuclide ao="1.0044728829940631e-05" name="U234" />
     <nuclide ao="0.0010193377809846768" name="U235" />
     <nuclide ao="0.022134335403001696" name="U238" />
-    <nuclide ao="5.17463717580927e-09" name="Xe135" />
-    <nuclide ao="1.607404832278296e-06" name="Xe136" />
+    <nuclide ao="5.174637175809274e-09" name="Xe135" />
+    <nuclide ao="1.6074048322782988e-06" name="Xe136" />
   </material>
   <material depletable="true" id="4" temperature="293.6" volume="0.06674732823364922">
     <density units="sum" />
@@ -48,12 +48,12 @@
     <nuclide ao="0.00011276839999999999" name="O17" />
     <nuclide ao="4.542189401531697e-07" name="Cs135" />
     <nuclide ao="7.626788139129838e-09" name="Gd156" />
-    <nuclide ao="4.554036803723092e-10" name="Gd157" />
-    <nuclide ao="8.895917147950859e-09" name="I135" />
+    <nuclide ao="4.554036803723083e-10" name="Gd157" />
+    <nuclide ao="8.895917147950857e-09" name="I135" />
     <nuclide ao="1.0044742882017663e-05" name="U234" />
     <nuclide ao="0.0010195876256423235" name="U235" />
     <nuclide ao="0.022134338074593186" name="U238" />
-    <nuclide ao="5.204386319535497e-09" name="Xe135" />
+    <nuclide ao="5.204386319535494e-09" name="Xe135" />
     <nuclide ao="1.584256968309388e-06" name="Xe136" />
   </material>
   <material depletable="true" id="5" temperature="293.6" volume="0.06674732823364922">
@@ -67,7 +67,7 @@
     <nuclide ao="0.001020680539756473" name="U235" />
     <nuclide ao="0.02169185104259157" name="U238" />
     <nuclide ao="4.953957753020382e-09" name="Xe135" />
-    <nuclide ao="4.222498934374298e-07" name="Xe136" />
+    <nuclide ao="4.2224989343743e-07" name="Xe136" />
   </material>
   <material depletable="true" id="6" temperature="293.6" volume="0.06674732823364922">
     <density units="sum" />
@@ -80,7 +80,7 @@
     <nuclide ao="1.0045052172260698e-05" name="U234" />
     <nuclide ao="0.0010182855830539153" name="U235" />
     <nuclide ao="0.022134415874096557" name="U238" />
-    <nuclide ao="5.070841178646677e-09" name="Xe135" />
+    <nuclide ao="5.070841178646676e-09" name="Xe135" />
     <nuclide ao="1.668376743604047e-06" name="Xe136" />
   </material>
   <material depletable="true" id="7" temperature="293.6" volume="0.06674732823364922">
@@ -89,26 +89,26 @@
     <nuclide ao="0.00011276839999999999" name="O17" />
     <nuclide ao="4.3759923148120817e-07" name="Cs135" />
     <nuclide ao="7.232791130625652e-09" name="Gd156" />
-    <nuclide ao="3.792760808155052e-10" name="Gd157" />
-    <nuclide ao="1.115660128573494e-08" name="I135" />
+    <nuclide ao="3.7927608081550524e-10" name="Gd157" />
+    <nuclide ao="1.1156601285734938e-08" name="I135" />
     <nuclide ao="1.004487073698697e-05" name="U234" />
     <nuclide ao="0.0010209689261418493" name="U235" />
     <nuclide ao="0.02213459371150142" name="U238" />
-    <nuclide ao="5.144327718930223e-09" name="Xe135" />
+    <nuclide ao="5.1443277189302275e-09" name="Xe135" />
     <nuclide ao="1.5202410851946595e-06" name="Xe136" />
   </material>
   <material depletable="true" id="8" temperature="293.6" volume="0.06674732823364922">
     <density units="sum" />
     <nuclide ao="0.046295399999999994" name="O16" />
     <nuclide ao="0.00011276839999999999" name="O17" />
-    <nuclide ao="4.2806757694679807e-07" name="Cs135" />
+    <nuclide ao="4.280675769467985e-07" name="Cs135" />
     <nuclide ao="7.10207611740966e-09" name="Gd156" />
-    <nuclide ao="3.928235145249647e-10" name="Gd157" />
+    <nuclide ao="3.928235145249649e-10" name="Gd157" />
     <nuclide ao="1.0609418645407898e-08" name="I135" />
     <nuclide ao="1.0045055277866812e-05" name="U234" />
     <nuclide ao="0.0010225358567290844" name="U235" />
     <nuclide ao="0.022134460728100176" name="U238" />
-    <nuclide ao="5.0634492814917475e-09" name="Xe135" />
+    <nuclide ao="5.0634492814917524e-09" name="Xe135" />
     <nuclide ao="1.4482994979866368e-06" name="Xe136" />
   </material>
   <material depletable="true" id="9" temperature="293.6" volume="0.06674732823364922">
@@ -116,13 +116,13 @@
     <nuclide ao="0.046295399999999994" name="O16" />
     <nuclide ao="0.00011276839999999999" name="O17" />
     <nuclide ao="4.559793845032722e-07" name="Cs135" />
-    <nuclide ao="7.582229687374046e-09" name="Gd156" />
-    <nuclide ao="4.4564404684709084e-10" name="Gd157" />
+    <nuclide ao="7.582229687374048e-09" name="Gd156" />
+    <nuclide ao="4.456440468470913e-10" name="Gd157" />
     <nuclide ao="1.029443385362887e-08" name="I135" />
     <nuclide ao="1.0044938876088381e-05" name="U234" />
     <nuclide ao="0.0010192632278857815" name="U235" />
     <nuclide ao="0.02213445313268344" name="U238" />
-    <nuclide ao="5.2755280107608386e-09" name="Xe135" />
+    <nuclide ao="5.275528010760839e-09" name="Xe135" />
     <nuclide ao="1.596587382150181e-06" name="Xe136" />
   </material>
   <material depletable="true" id="10" temperature="293.6" volume="0.06674732823364922">
@@ -132,40 +132,40 @@
     <nuclide ao="4.44817494586689e-07" name="Cs135" />
     <nuclide ao="7.490669966660647e-09" name="Gd156" />
     <nuclide ao="4.71815870798701e-10" name="Gd157" />
-    <nuclide ao="9.867587758336676e-09" name="I135" />
+    <nuclide ao="9.867587758336683e-09" name="I135" />
     <nuclide ao="1.0044704634003168e-05" name="U234" />
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+    <nuclide ao="1.5357161329193738e-06" name="Xe136" />
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+    <nuclide ao="4.493995007417953e-09" name="Xe135" />
+    <nuclide ao="1.4836002218798116e-06" name="Xe136" />
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+    <nuclide ao="5.784335592645143e-09" name="Xe135" />
+    <nuclide ao="1.806994566735355e-06" name="Xe136" />
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@@ -178,35 +178,35 @@
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+    <nuclide ao="5.0312946439815415e-09" name="Xe135" />
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-    <nuclide ao="4.3666286537020926e-07" name="Cs135" />
+    <nuclide ao="4.366628653702094e-07" name="Cs135" />
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+    <nuclide ao="6.018911562873914e-09" name="Xe135" />
+    <nuclide ao="4.6001612138267453e-07" name="Xe136" />
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+    <nuclide ao="4.3139411048431606e-07" name="Cs135" />
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+    <nuclide ao="8.878225988486557e-09" name="I135" />
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-    <nuclide ao="1.4631077263677625e-06" name="Xe136" />
+    <nuclide ao="1.463107726367763e-06" name="Xe136" />
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@@ -214,7 +214,7 @@
     <nuclide ao="0.00011276839999999999" name="O17" />
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@@ -228,13 +228,13 @@
     <nuclide ao="0.00011276839999999999" name="O17" />
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-    <nuclide ao="4.0269493520725056e-10" name="Gd157" />
+    <nuclide ao="4.0269493520725103e-10" name="Gd157" />
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-    <nuclide ao="1.6155021246783795e-06" name="Xe136" />
+    <nuclide ao="1.6155021246783818e-06" name="Xe136" />
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@@ -256,12 +256,12 @@
     <nuclide ao="0.00011276839999999999" name="O17" />
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     <nuclide ao="8.456093507204118e-09" name="Gd156" />
-    <nuclide ao="4.2015409417453396e-10" name="Gd157" />
+    <nuclide ao="4.2015409417453355e-10" name="Gd157" />
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+    <nuclide ao="5.2798561098426515e-09" name="Xe135" />
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@@ -270,7 +270,7 @@
     <nuclide ao="0.00011276839999999999" name="O17" />
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     <nuclide ao="6.7946743438445464e-09" name="Gd156" />
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@@ -284,33 +284,33 @@
     <nuclide ao="0.00011276839999999999" name="O17" />
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+    <nuclide ao="4.91086100779947e-10" name="Gd157" />
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-    <nuclide ao="1.578386750630591e-06" name="Xe136" />
+    <nuclide ao="1.5783867506305915e-06" name="Xe136" />
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+    <nuclide ao="4.354557191546753e-10" name="Gd157" />
+    <nuclide ao="8.81795509883174e-09" name="I135" />
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+    <nuclide ao="5.0725494457768e-09" name="Xe135" />
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@@ -324,13 +324,13 @@
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+    <nuclide ao="6.770703705610544e-09" name="Gd156" />
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-    <nuclide ao="5.519902727491704e-09" name="Xe135" />
+    <nuclide ao="5.5199027274917046e-09" name="Xe135" />
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@@ -339,13 +339,13 @@
     <nuclide ao="0.00011276839999999999" name="O17" />
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+    <nuclide ao="3.541968694217363e-10" name="Gd157" />
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+    <nuclide ao="5.1705089469748246e-09" name="Xe135" />
+    <nuclide ao="1.7092763789502104e-06" name="Xe136" />
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@@ -353,27 +353,27 @@
     <nuclide ao="0.00011276839999999999" name="O17" />
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-    <nuclide ao="1.4088788220239342e-06" name="Xe136" />
+    <nuclide ao="5.150498408472716e-09" name="Xe135" />
+    <nuclide ao="1.4088788220239346e-06" name="Xe136" />
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+    <nuclide ao="4.381486279336876e-07" name="Cs135" />
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-    <nuclide ao="3.690889736776625e-10" name="Gd157" />
+    <nuclide ao="3.690889736776621e-10" name="Gd157" />
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+    <nuclide ao="4.960965035278435e-09" name="Xe135" />
+    <nuclide ao="1.5235255296592858e-06" name="Xe136" />
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@@ -386,7 +386,7 @@
     <nuclide ao="1.0044999262183289e-05" name="U234" />
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+    <nuclide ao="5.174362016717773e-09" name="Xe135" />
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@@ -395,7 +395,7 @@
     <nuclide ao="0.00011276839999999999" name="O17" />
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+    <nuclide ao="5.210381185533892e-10" name="Gd157" />
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@@ -414,21 +414,21 @@
     <nuclide ao="1.0044716051458474e-05" name="U234" />
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-    <nuclide ao="5.610024692436443e-09" name="Xe135" />
+    <nuclide ao="5.610024692436442e-09" name="Xe135" />
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+    <nuclide ao="4.426186060093042e-10" name="Gd157" />
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+    <nuclide ao="5.193841793888193e-09" name="Xe135" />
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@@ -441,21 +441,21 @@
     <nuclide ao="9.995070953207503e-22" name="U234" />
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+    <nuclide ao="4.914919301108289e-09" name="Xe135" />
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+    <nuclide ao="4.262143694536212e-07" name="Cs135" />
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@@ -463,14 +463,14 @@
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@@ -478,13 +478,13 @@
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@@ -492,34 +492,34 @@
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@@ -534,13 +534,13 @@
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@@ -548,67 +548,67 @@
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+    <nuclide ao="4.931332484293642e-09" name="Xe135" />
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+    <nuclide ao="7.397202026814996e-07" name="Xe136" />
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@@ -622,8 +622,8 @@
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+    <nuclide ao="5.2244790065248964e-09" name="Xe135" />
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@@ -631,13 +631,13 @@
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@@ -646,11 +646,11 @@
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@@ -658,7 +658,7 @@
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@@ -673,67 +673,67 @@
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@@ -747,8 +747,8 @@
     <nuclide ao="1.004494748216533e-05" name="U234" />
     <nuclide ao="0.0010205468253602235" name="U235" />
     <nuclide ao="0.022134404745910514" name="U238" />
-    <nuclide ao="5.64557754951887e-09" name="Xe135" />
-    <nuclide ao="1.5306617859713359e-06" name="Xe136" />
+    <nuclide ao="5.6455775495188695e-09" name="Xe135" />
+    <nuclide ao="1.5306617859713382e-06" name="Xe136" />
   </material>
   <material depletable="true" id="55" temperature="293.6" volume="0.06674732823364922">
     <density units="sum" />
@@ -761,7 +761,7 @@
     <nuclide ao="1.0044841974871586e-05" name="U234" />
     <nuclide ao="0.0010110822723009053" name="U235" />
     <nuclide ao="0.022134414293992426" name="U238" />
-    <nuclide ao="5.541538302298647e-09" name="Xe135" />
+    <nuclide ao="5.54153830229865e-09" name="Xe135" />
     <nuclide ao="2.047954597480279e-06" name="Xe136" />
   </material>
   <material depletable="true" id="56" temperature="293.6" volume="0.06674732823364922">
@@ -775,16 +775,16 @@
     <nuclide ao="1.0045167744603086e-05" name="U234" />
     <nuclide ao="0.001019391862763641" name="U235" />
     <nuclide ao="0.022134553337089653" name="U238" />
-    <nuclide ao="4.969768731408184e-09" name="Xe135" />
+    <nuclide ao="4.969768731408186e-09" name="Xe135" />
     <nuclide ao="1.609697246275471e-06" name="Xe136" />
   </material>
   <material depletable="true" id="57" temperature="293.6" volume="0.06674732823364922">
     <density units="sum" />
     <nuclide ao="0.046295399999999994" name="O16" />
     <nuclide ao="0.00011276839999999999" name="O17" />
-    <nuclide ao="4.35046517633175e-07" name="Cs135" />
+    <nuclide ao="4.350465176331747e-07" name="Cs135" />
     <nuclide ao="8.084805372194225e-09" name="Gd156" />
-    <nuclide ao="4.6229222465392174e-10" name="Gd157" />
+    <nuclide ao="4.622922246539213e-10" name="Gd157" />
     <nuclide ao="1.0284393004311192e-08" name="I135" />
     <nuclide ao="1.0044795730918044e-05" name="U234" />
     <nuclide ao="0.0010165292395930337" name="U235" />
@@ -797,26 +797,26 @@
     <nuclide ao="0.046295399999999994" name="O16" />
     <nuclide ao="0.00011276839999999999" name="O17" />
     <nuclide ao="4.447029743115016e-07" name="Cs135" />
-    <nuclide ao="7.570185887081655e-09" name="Gd156" />
-    <nuclide ao="4.117097062323973e-10" name="Gd157" />
+    <nuclide ao="7.570185887081661e-09" name="Gd156" />
+    <nuclide ao="4.1170970623239726e-10" name="Gd157" />
     <nuclide ao="8.668651144522478e-09" name="I135" />
     <nuclide ao="1.004515018934129e-05" name="U234" />
     <nuclide ao="0.0010185968960445021" name="U235" />
     <nuclide ao="0.022134616035086256" name="U238" />
-    <nuclide ao="4.840126346417231e-09" name="Xe135" />
+    <nuclide ao="4.840126346417234e-09" name="Xe135" />
     <nuclide ao="1.6430922547288802e-06" name="Xe136" />
   </material>
   <material depletable="true" id="59" temperature="293.6" volume="0.06674732823364922">
     <density units="sum" />
     <nuclide ao="0.0464035" name="O16" />
-    <nuclide ao="4.182274364192077e-07" name="Cs135" />
-    <nuclide ao="4.858821210573051e-09" name="Gd156" />
-    <nuclide ao="1.2712801327186997e-05" name="Gd157" />
+    <nuclide ao="4.182274364192082e-07" name="Cs135" />
+    <nuclide ao="4.858821210573053e-09" name="Gd156" />
+    <nuclide ao="1.2712801327186966e-05" name="Gd157" />
     <nuclide ao="6.269805602298675e-09" name="I135" />
     <nuclide ao="9.994834375510738e-22" name="U234" />
     <nuclide ao="0.001015193002454881" name="U235" />
     <nuclide ao="0.02169191550126278" name="U238" />
-    <nuclide ao="5.3704388501829024e-09" name="Xe135" />
+    <nuclide ao="5.370438850182902e-09" name="Xe135" />
     <nuclide ao="7.163824347371378e-07" name="Xe136" />
   </material>
   <material depletable="true" id="60" temperature="293.6" volume="0.06674732823364922">
@@ -839,26 +839,26 @@
     <nuclide ao="0.00011276839999999999" name="O17" />
     <nuclide ao="4.255465099527304e-07" name="Cs135" />
     <nuclide ao="8.318303505211385e-09" name="Gd156" />
-    <nuclide ao="3.1400746275516196e-10" name="Gd157" />
-    <nuclide ao="1.3634332412911229e-08" name="I135" />
+    <nuclide ao="3.1400746275516165e-10" name="Gd157" />
+    <nuclide ao="1.3634332412911234e-08" name="I135" />
     <nuclide ao="1.0045194872962027e-05" name="U234" />
     <nuclide ao="0.0010134682264045134" name="U235" />
     <nuclide ao="0.022134627572403424" name="U238" />
-    <nuclide ao="5.660240799023148e-09" name="Xe135" />
-    <nuclide ao="1.9320369664452564e-06" name="Xe136" />
+    <nuclide ao="5.660240799023151e-09" name="Xe135" />
+    <nuclide ao="1.932036966445259e-06" name="Xe136" />
   </material>
   <material depletable="true" id="62" temperature="293.6" volume="0.06674732823364922">
     <density units="sum" />
     <nuclide ao="0.046295399999999994" name="O16" />
     <nuclide ao="0.00011276839999999999" name="O17" />
-    <nuclide ao="4.393812456460318e-07" name="Cs135" />
+    <nuclide ao="4.3938124564603216e-07" name="Cs135" />
     <nuclide ao="7.578485867069532e-09" name="Gd156" />
     <nuclide ao="3.960863576757495e-10" name="Gd157" />
-    <nuclide ao="1.074708615052332e-08" name="I135" />
+    <nuclide ao="1.0747086150523316e-08" name="I135" />
     <nuclide ao="1.0044777645976812e-05" name="U234" />
     <nuclide ao="0.0010192733257713184" name="U235" />
     <nuclide ao="0.02213447098884612" name="U238" />
-    <nuclide ao="5.68208755509583e-09" name="Xe135" />
+    <nuclide ao="5.682087555095832e-09" name="Xe135" />
     <nuclide ao="1.6115024879852818e-06" name="Xe136" />
   </material>
   <material depletable="true" id="63" temperature="293.6" volume="0.06674732823364922">
@@ -867,13 +867,13 @@
     <nuclide ao="0.00011276839999999999" name="O17" />
     <nuclide ao="4.323344507867884e-07" name="Cs135" />
     <nuclide ao="7.878040083800914e-09" name="Gd156" />
-    <nuclide ao="3.694960009567542e-10" name="Gd157" />
-    <nuclide ao="1.1270587956724962e-08" name="I135" />
+    <nuclide ao="3.69496000956754e-10" name="Gd157" />
+    <nuclide ao="1.1270587956724959e-08" name="I135" />
     <nuclide ao="1.0044970458379827e-05" name="U234" />
     <nuclide ao="0.0010179301808035533" name="U235" />
     <nuclide ao="0.02213433247583579" name="U238" />
-    <nuclide ao="5.037799887862635e-09" name="Xe135" />
-    <nuclide ao="1.6931304843173707e-06" name="Xe136" />
+    <nuclide ao="5.037799887862632e-09" name="Xe135" />
+    <nuclide ao="1.6931304843173695e-06" name="Xe136" />
   </material>
   <material depletable="true" id="64" temperature="293.6" volume="0.06674732823364922">
     <density units="sum" />
@@ -881,7 +881,7 @@
     <nuclide ao="0.00011276839999999999" name="O17" />
     <nuclide ao="4.3155946331553374e-07" name="Cs135" />
     <nuclide ao="8.408717020675131e-09" name="Gd156" />
-    <nuclide ao="4.119293155517889e-10" name="Gd157" />
+    <nuclide ao="4.1192931555178943e-10" name="Gd157" />
     <nuclide ao="1.0146134311128144e-08" name="I135" />
     <nuclide ao="1.004500917944451e-05" name="U234" />
     <nuclide ao="0.0010138336101878384" name="U235" />
@@ -900,21 +900,21 @@
     <nuclide ao="1.004446288472635e-05" name="U234" />
     <nuclide ao="0.0010175217978502574" name="U235" />
     <nuclide ao="0.02213428335011924" name="U238" />
-    <nuclide ao="4.817103365460689e-09" name="Xe135" />
-    <nuclide ao="1.736491146887201e-06" name="Xe136" />
+    <nuclide ao="4.8171033654606865e-09" name="Xe135" />
+    <nuclide ao="1.7364911468872036e-06" name="Xe136" />
   </material>
   <material depletable="true" id="66" temperature="293.6" volume="0.06674732823364922">
     <density units="sum" />
     <nuclide ao="0.046295399999999994" name="O16" />
     <nuclide ao="0.00011276839999999999" name="O17" />
-    <nuclide ao="4.6249581820235055e-07" name="Cs135" />
+    <nuclide ao="4.6249581820235097e-07" name="Cs135" />
     <nuclide ao="8.572410030220836e-09" name="Gd156" />
-    <nuclide ao="3.958985189864489e-10" name="Gd157" />
+    <nuclide ao="3.9589851898644926e-10" name="Gd157" />
     <nuclide ao="1.1470322368180702e-08" name="I135" />
     <nuclide ao="1.0044754227774947e-05" name="U234" />
     <nuclide ao="0.001012600780771411" name="U235" />
     <nuclide ao="0.022134457548903287" name="U238" />
-    <nuclide ao="5.267287889744424e-09" name="Xe135" />
+    <nuclide ao="5.2672878897444246e-09" name="Xe135" />
     <nuclide ao="1.947076459381606e-06" name="Xe136" />
   </material>
   <material depletable="true" id="67" temperature="293.6" volume="0.06674732823364922">
@@ -922,8 +922,8 @@
     <nuclide ao="0.046295399999999994" name="O16" />
     <nuclide ao="0.00011276839999999999" name="O17" />
     <nuclide ao="4.514821244247708e-07" name="Cs135" />
-    <nuclide ao="7.888980777214178e-09" name="Gd156" />
-    <nuclide ao="3.943731183361514e-10" name="Gd157" />
+    <nuclide ao="7.888980777214183e-09" name="Gd156" />
+    <nuclide ao="3.943731183361515e-10" name="Gd157" />
     <nuclide ao="9.096319095429609e-09" name="I135" />
     <nuclide ao="1.0045086971880225e-05" name="U234" />
     <nuclide ao="0.001016165183486977" name="U235" />
@@ -934,14 +934,14 @@
   <material depletable="true" id="68" temperature="293.6" volume="0.06674732823364922">
     <density units="sum" />
     <nuclide ao="0.0464035" name="O16" />
-    <nuclide ao="4.001714979821851e-07" name="Cs135" />
+    <nuclide ao="4.0017149798218536e-07" name="Cs135" />
     <nuclide ao="4.601018035351548e-09" name="Gd156" />
     <nuclide ao="1.6199371284731447e-05" name="Gd157" />
-    <nuclide ao="5.923365153621547e-09" name="I135" />
+    <nuclide ao="5.9233651536215515e-09" name="I135" />
     <nuclide ao="9.9948280076224e-22" name="U234" />
     <nuclide ao="0.0010172176953620639" name="U235" />
     <nuclide ao="0.021691863443143826" name="U238" />
-    <nuclide ao="5.099605733937212e-09" name="Xe135" />
+    <nuclide ao="5.099605733937214e-09" name="Xe135" />
     <nuclide ao="6.270359768576665e-07" name="Xe136" />
   </material>
   <material depletable="true" id="69" temperature="293.6" volume="0.06674732823364922">
@@ -950,7 +950,7 @@
     <nuclide ao="0.00011276839999999999" name="O17" />
     <nuclide ao="4.373002216816769e-07" name="Cs135" />
     <nuclide ao="8.10466894697993e-09" name="Gd156" />
-    <nuclide ao="3.980082090165549e-10" name="Gd157" />
+    <nuclide ao="3.9800820901655483e-10" name="Gd157" />
     <nuclide ao="1.0466366392018935e-08" name="I135" />
     <nuclide ao="1.0045621879498482e-05" name="U234" />
     <nuclide ao="0.001013582403388038" name="U235" />
@@ -964,12 +964,12 @@
     <nuclide ao="0.00011276839999999999" name="O17" />
     <nuclide ao="4.3531353442394307e-07" name="Cs135" />
     <nuclide ao="7.81003289792918e-09" name="Gd156" />
-    <nuclide ao="4.2318823058011106e-10" name="Gd157" />
-    <nuclide ao="9.994767275045175e-09" name="I135" />
+    <nuclide ao="4.231882305801109e-10" name="Gd157" />
+    <nuclide ao="9.994767275045177e-09" name="I135" />
     <nuclide ao="1.0044404992700028e-05" name="U234" />
     <nuclide ao="0.00101745168907518" name="U235" />
     <nuclide ao="0.02213450398339581" name="U238" />
-    <nuclide ao="5.08663157763046e-09" name="Xe135" />
+    <nuclide ao="5.086631577630462e-09" name="Xe135" />
     <nuclide ao="1.714351229930211e-06" name="Xe136" />
   </material>
   <material depletable="true" id="71" temperature="293.6" volume="0.06674732823364922">
@@ -983,21 +983,21 @@
     <nuclide ao="1.0044829773222666e-05" name="U234" />
     <nuclide ao="0.001018948265719757" name="U235" />
     <nuclide ao="0.022134724441539442" name="U238" />
-    <nuclide ao="5.21779956108209e-09" name="Xe135" />
+    <nuclide ao="5.2177995610820925e-09" name="Xe135" />
     <nuclide ao="1.6384969094902849e-06" name="Xe136" />
   </material>
   <material depletable="true" id="72" temperature="293.6" volume="0.06674732823364922">
     <density units="sum" />
     <nuclide ao="0.046295399999999994" name="O16" />
     <nuclide ao="0.00011276839999999999" name="O17" />
-    <nuclide ao="4.2989214569673393e-07" name="Cs135" />
+    <nuclide ao="4.298921456967344e-07" name="Cs135" />
     <nuclide ao="7.472175332876386e-09" name="Gd156" />
     <nuclide ao="4.695600230063656e-10" name="Gd157" />
     <nuclide ao="8.590922950164814e-09" name="I135" />
     <nuclide ao="1.0045021051031072e-05" name="U234" />
     <nuclide ao="0.0010198929186005497" name="U235" />
     <nuclide ao="0.02213446910874194" name="U238" />
-    <nuclide ao="4.6952831306275485e-09" name="Xe135" />
+    <nuclide ao="4.695283130627553e-09" name="Xe135" />
     <nuclide ao="1.5908358918951317e-06" name="Xe136" />
   </material>
   <material id="73" temperature="293.6" volume="0.017528298008244847">
diff --git a/tests/regression_tests/deplete_with_transport/test_reference.h5 b/tests/regression_tests/deplete_with_transport/test_reference.h5
index d478d628ef..952994b86b 100644
Binary files a/tests/regression_tests/deplete_with_transport/test_reference.h5 and b/tests/regression_tests/deplete_with_transport/test_reference.h5 differ
diff --git a/tests/regression_tests/source/results_true.dat b/tests/regression_tests/source/results_true.dat
index 62eaf6eff9..f0d69afb5b 100644
--- a/tests/regression_tests/source/results_true.dat
+++ b/tests/regression_tests/source/results_true.dat
@@ -1,2 +1,2 @@
 k-combined:
-2.865754E-01 6.762423E-03
+3.073726E-01 2.535074E-03
diff --git a/tests/regression_tests/surface_source/surface_source_true.h5 b/tests/regression_tests/surface_source/surface_source_true.h5
index c26afee867..eb65846d1c 100644
Binary files a/tests/regression_tests/surface_source/surface_source_true.h5 and b/tests/regression_tests/surface_source/surface_source_true.h5 differ
diff --git a/vendor/Catch2 b/vendor/Catch2
new file mode 160000
index 0000000000..41990e0fe6
--- /dev/null
+++ b/vendor/Catch2
@@ -0,0 +1 @@
+Subproject commit 41990e0fe6274d716134eecfd4d780e976c8fbf5