diff --git a/openmc/data/data.py b/openmc/data/data.py
index 65702f7a5f..5aadfac870 100644
--- a/openmc/data/data.py
+++ b/openmc/data/data.py
@@ -295,7 +295,6 @@ def half_life(isotope):
     """
     global _HALF_LIFE
     if not _HALF_LIFE:
-        print('reading json file')
         # Load data from AME2016 file
         half_life_filename = os.path.join(os.path.dirname(__file__), 'half_life.json')
         with open(half_life_filename, 'r') as f:
diff --git a/openmc/material.py b/openmc/material.py
index 9706ffe786..e49696706f 100644
--- a/openmc/material.py
+++ b/openmc/material.py
@@ -151,7 +151,6 @@ class Material(IDManagerMixin):
         total_activity = 0
         for key, value in atoms_per_barn_cm2.items():
             half_life = openmc.data.half_life(key)
-            print('half_life', half_life)
             if half_life:
                 atoms = value[1] * self.volume * 1e24
                 activity = math.log(2) * atoms / half_life
@@ -723,7 +722,6 @@ class Material(IDManagerMixin):
     def make_isotropic_in_lab(self):
         self.isotropic = [x.name for x in self._nuclides]
 
-
     def get_elements(self):
         """Returns all elements in the material
 
diff --git a/tests/unit_tests/test_material.py b/tests/unit_tests/test_material.py
index baef3f9ef5..c5d3276a01 100644
--- a/tests/unit_tests/test_material.py
+++ b/tests/unit_tests/test_material.py
@@ -422,3 +422,4 @@ def test_activity_of_tritium():
     m1.set_density('g/cm3', 1)
     m1.volume = 1
     assert pytest.approx(m1.activity) == 3.559778e14 
+