diff --git a/openmc_plasma_source/fuel_types.py b/openmc_plasma_source/fuel_types.py
index 902a5b1..3d84b71 100644
--- a/openmc_plasma_source/fuel_types.py
+++ b/openmc_plasma_source/fuel_types.py
@@ -4,12 +4,16 @@
 for a given fusion fuel type.
 """
 
-import proper_tea as pt
+from param import Parameterized, Number
 
 
-class Fuel:
-    mean_energy = pt.positive_float(allow_zero=False)  # mean energy, eV
-    mass_of_reactants = pt.positive(allow_zero=False)  # mass of the reactants, AMU
+class Fuel(Parameterized):
+
+    # mean energy, eV
+    mean_energy = Number(None, bounds=(0, None), inclusive_bounds=(False, False))
+
+    # mass of the reactants, AMU
+    mass_of_reactants = Number(None, bounds=(0, None), inclusive_bounds=(False, False))
 
     def __init__(self, mean_energy, mass_of_reactants):
         self.mean_energy = mean_energy
diff --git a/openmc_plasma_source/point_source.py b/openmc_plasma_source/point_source.py
index 61cb889..89f7811 100644
--- a/openmc_plasma_source/point_source.py
+++ b/openmc_plasma_source/point_source.py
@@ -1,12 +1,11 @@
+import openmc
 from typing import Tuple
-import proper_tea as pt
-import proper_tea.numpy
-from .fuel_types import fuel_types
+from param import Parameterized, Number, NumericTuple, ListSelector
 
-import openmc
+from .fuel_types import fuel_types
 
 
-class FusionPointSource(openmc.Source):
+class FusionPointSource(openmc.Source, Parameterized):
     """An openmc.Source object with some presets to make it more convenient
     for fusion simulations using a point source. All attributes can be changed
     after initialization if required. Default isotropic point source at the
@@ -19,9 +18,9 @@ class FusionPointSource(openmc.Source):
         fuel_type (str): The fusion fuel mix. Either 'DT' or 'DD'.
     """
 
-    coordinate = pt.numpy.numpy_array(shape=(3,), dtype=float)
-    temperature = pt.positive_float()  # temperature in eV
-    fuel_type = pt.in_set(fuel_types.keys())
+    coordinate = NumericTuple(None, length=3)
+    temperature = Number(None, bounds=(0, None))  # temperature in eV
+    fuel_type = ListSelector(fuel_types.keys())
 
     def __init__(
         self,
diff --git a/openmc_plasma_source/ring_source.py b/openmc_plasma_source/ring_source.py
index 452f14f..a0cfb0a 100644
--- a/openmc_plasma_source/ring_source.py
+++ b/openmc_plasma_source/ring_source.py
@@ -1,13 +1,12 @@
-from typing import Tuple
+import openmc
 import numpy as np
-import proper_tea as pt
-import proper_tea.numpy
-from .fuel_types import fuel_types
+from typing import Tuple
+from param import Parameterized, Number, Range, ListSelector
 
-import openmc
+from .fuel_types import fuel_types
 
 
-class FusionRingSource(openmc.Source):
+class FusionRingSource(openmc.Source, Parameterized):
     """An openmc.Source object with some presets to make it more convenient
     for fusion simulations using a ring source. All attributes can be changed
     after initialization if required. Default isotropic ring source with a Muir
@@ -21,11 +20,11 @@ class FusionRingSource(openmc.Source):
         fuel_type (str): The fusion fuel mix. Either 'DT' or 'DD'.
     """
 
-    radius = pt.positive_float()
-    angles = pt.numpy.numpy_array(shape=(2,), dtype=float, sort=True)
-    z_placement = pt.floating_point()
-    temperature = pt.positive_float()
-    fuel_type = pt.in_set(fuel_types.keys())
+    radius = Number(None, bounds=(0, None), inclusive_bounds=(False, False))
+    angles = Range((0, 2 * np.pi))
+    z_placement = Number()
+    temperature = Number(bounds=(0, None))
+    fuel_type = ListSelector(fuel_types.keys())
 
     def __init__(
         self,
diff --git a/openmc_plasma_source/tokamak_source.py b/openmc_plasma_source/tokamak_source.py
index badea6e..9387085 100644
--- a/openmc_plasma_source/tokamak_source.py
+++ b/openmc_plasma_source/tokamak_source.py
@@ -1,11 +1,10 @@
-from typing import Tuple
-import numpy as np
-import proper_tea as pt
-import proper_tea.numpy
 import openmc
+import numpy as np
+from typing import Tuple
+from param import Parameterized, Number, Integer, Range, ListSelector
 
 
-class TokamakSource:
+class TokamakSource(Parameterized):
     """Plasma neutron source sampling.
     This class greatly relies on models described in [1]
 
@@ -50,23 +49,23 @@ class TokamakSource:
             to 1000.
     """
 
-    major_radius = pt.positive_float(allow_zero=False)
-    minor_radius = pt.positive_float(allow_zero=False)
-    elongation = pt.positive_float(allow_zero=False)
-    triangularity = pt.in_range(bounds=(-1.0, 1.0))
-    mode = pt.in_set({"H", "L", "A"})
-    ion_density_centre = pt.positive_float()
-    ion_density_peaking_factor = pt.floating_point()
-    ion_density_pedestal = pt.positive_float()
-    ion_density_separatrix = pt.positive_float()
-    ion_temperature_centre = pt.positive_float()
-    ion_temperature_peaking_factor = pt.floating_point()
-    ion_temperature_beta = pt.floating_point()
-    ion_temperature_pedestal = pt.positive_float()
-    ion_temperature_separatrix = pt.positive_float()
-    pedestal_radius = pt.positive_float(allow_zero=False)
-    angles = pt.numpy.numpy_array(shape=(2,), dtype=float, sort=True)
-    sample_size = pt.positive_int(allow_zero=False)
+    major_radius = Number(None, bounds=(0, None), inclusive_bounds=(False, False))
+    minor_radius = Number(None, bounds=(0, None), inclusive_bounds=(False, False))
+    elongation = Number(None, bounds=(0, None), inclusive_bounds=(False, False))
+    triangularity = Number(bounds=(-1.0, 1.0))
+    mode = ListSelector(["H", "L", "A"])
+    ion_density_centre = Number(bounds=(0, None))
+    ion_density_peaking_factor = Number()
+    ion_density_pedestal = Number(bounds=(0, None))
+    ion_density_separatrix = Number(bounds=(0, None))
+    ion_temperature_centre = Number(bounds=(0, None))
+    ion_temperature_peaking_factor = Number()
+    ion_temperature_beta = Number()
+    ion_temperature_pedestal = Number(bounds=(0, None))
+    ion_temperature_separatrix = Number(bounds=(0, None))
+    pedestal_radius = Number(None, bounds=(0, None), inclusive_bounds=(False, False))
+    angles = Range((0, 2 * np.pi))
+    sample_size = Integer(None, bounds=(0, None), inclusive_bounds=(False, False))
 
     def __init__(
         self,
diff --git a/setup.cfg b/setup.cfg
index d89e89a..5f57ee7 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -28,7 +28,7 @@ python_requires= >=3.6
 install_requires=
     numpy >= 1.9
     matplotlib >= 3.2.2
-    proper_tea ~= 0.3.4
+    param ~= 1.12.0
     importlib-metadata; python_version < "3.8"
 
 [options.extras_require]
diff --git a/tests/test_point_source.py b/tests/test_point_source.py
index 00655ef..11bb78e 100644
--- a/tests/test_point_source.py
+++ b/tests/test_point_source.py
@@ -18,17 +18,17 @@ def test_creation():
 
 
 @pytest.mark.parametrize(
-    "coordinate", [(1.0, 2.0, 3.0), [4, 5, 6], np.linspace(1.0, 3.0, 3)]
+    "coordinate", [(1.0, 2.0, 3.0), (4, 5, 6), tuple(np.linspace(1.0, 3.0, 3))]
 )
 def test_coordinate(coordinate):
-    # Should allow any iterable of length 3 with contents convertible to float
+    # Should allow any tuple of length 3 containing numbers
     my_source = FusionPointSource(coordinate=coordinate)
     assert np.array_equal(my_source.coordinate, coordinate)
 
 
-@pytest.mark.parametrize("coordinate", [(1, 2), [3, 4, 5, 6], 5, "abc"])
+@pytest.mark.parametrize("coordinate", [(1, 2), [3, 4, 5], 5, "abc", ("a", "b", "c")])
 def test_bad_coordinate(coordinate):
-    # Should reject iterables of length != 3, anything non iterable, and anything
+    # Should reject iterables of length != 3, anything non-tuple, and anything
     # that can't convert to float
     with pytest.raises(ValueError):
         FusionPointSource(coordinate=coordinate)
@@ -58,5 +58,5 @@ def test_fuel(fuel):
 @pytest.mark.parametrize("fuel", ["топливо", 5])
 def test_wrong_fuel(fuel):
     # Should reject fuel types besides those listed in fuel_types.py
-    with pytest.raises(ValueError):
+    with pytest.raises((KeyError, TypeError)):
         FusionPointSource(fuel=fuel)
diff --git a/tests/test_ring_source.py b/tests/test_ring_source.py
index 7816304..4df2e36 100644
--- a/tests/test_ring_source.py
+++ b/tests/test_ring_source.py
@@ -31,18 +31,16 @@ def test_bad_radius(radius):
         my_source = FusionRingSource(radius=radius)
 
 
-@pytest.mark.parametrize("angles", [(1.0, 2), [0, np.pi], (np.pi, 0)])
+@pytest.mark.parametrize("angles", [(1.0, 2), (0, np.pi), (np.pi, 0)])
 def test_angles(angles):
-    # Should allow any iterable of length 2 with contents convertible to float
-    # If angles are given in reverse order, it should sort them automatically
+    # Should allow any tuple of length 2 with contents convertible to float
     my_source = FusionRingSource(radius=1.0, angles=angles)
-    assert np.array_equal(my_source.angles, sorted(angles))
-    assert my_source.angles[0] < my_source.angles[1]
+    assert np.array_equal(my_source.angles, angles)
 
 
-@pytest.mark.parametrize("angles", [(1,), [1, 2, 3, 4], 5, "ab"])
+@pytest.mark.parametrize("angles", [(1,), [1, 2], 5, "ab", ("a", "b")])
 def test_bad_angles(angles):
-    # Should reject iterables of length != 2, anything non iterable, and anything
+    # Should reject iterables of length != 2, anything non tuple, and anything
     # that can't convert to float
     with pytest.raises(ValueError):
         FusionRingSource(radius=1.0, angles=angles)
@@ -72,5 +70,5 @@ def test_fuel(fuel):
 @pytest.mark.parametrize("fuel", ["топливо", 5])
 def test_wrong_fuel(fuel):
     # Should reject fuel types besides those listed in fuel_types.py
-    with pytest.raises(ValueError):
+    with pytest.raises((KeyError, TypeError)):
         FusionRingSource(radius=1.0, fuel=fuel)
diff --git a/tests/test_tokamak_source.py b/tests/test_tokamak_source.py
index 740acea..714f130 100644
--- a/tests/test_tokamak_source.py
+++ b/tests/test_tokamak_source.py
@@ -171,12 +171,12 @@ def test_bad_shafranov_factor(tokamak_args_dict, major_radius, minor_radius, sha
 )
 def test_angles(tokamak_args_dict, angles):
     """Checks that custom angles can be set"""
-    # Note: should accept negative angles and angles in wrong order
+    # Note: should accept negative angles and angles in reverse order
     tokamak_args_dict["angles"] = angles
     tokamak_source = TokamakSource(**tokamak_args_dict)
-    assert np.array_equal(tokamak_source.angles, sorted(angles))
+    assert np.array_equal(tokamak_source.angles, angles)
     for source in tokamak_source.sources:
-        assert np.array_equal((source.space.phi.a, source.space.phi.b), sorted(angles))
+        assert np.array_equal((source.space.phi.a, source.space.phi.b), angles)
 
 
 @pytest.mark.parametrize("angles", [(0, 1, 2), -5, ("hello", "world")])