def test_energy_transfer_cross_section(self):
# The plot from github.com/tomkooij/lio-project/photons/check_sapphire_gammas.py
# has been checked with Evans (1955) p. 693 figure 5.1
# Peaks from this plot: (E [MeV], cross_section [barn])
combinations = ((0.511, 1.6), (1.2, 0.52), (2.76, 0.22))
barn = 1e-28 # m**2. Note that the figure in Evans is in centibarn!
for E, cross_section in combinations:
edge = gammas.compton_edge(E)
self.assertAlmostEqual(gammas.energy_transfer_cross_section(E, edge) / barn, cross_section, places=1)
def test_energy_transfer_cross_section(self):
# The plot from github.com/tomkooij/lio-project/photons/check_sapphire_gammas.py
# has been checked with Evans (1955) p. 693 figure 5.1
# Peaks from this plot: (E [MeV], cross_section [barn])
combinations = ((0.511, 1.6), (1.2, 0.52), (2.76, 0.22))
barn = 1e-28 # m**2. Note that the figure in Evans is in centibarn!
for E, cross_section in combinations:
edge = gammas.compton_edge(E)
self.assertAlmostEqual(gammas.energy_transfer_cross_section(E, edge) / barn, cross_section, places=1)
def test_compton_energy_transfer(self, mock_random):
# if random() return 1, energy should approach the kinematic maximum (compton edge)
mock_random.return_value = 1.0
for gamma_energy in [3., 10., 100.]:
expected = gammas.compton_edge(gamma_energy)
self.assertAlmostEqual(gammas.compton_energy_transfer(gamma_energy), expected, places=0)
# if random() returns 0, energy should approach 0
mock_random.return_value = 0.0
for gamma_energy in [3., 10., 100.]:
self.assertAlmostEqual(gammas.compton_energy_transfer(gamma_energy), 0.)
def test_compton_energy_transfer(self, mock_random):
# if random() return 1, energy should approach the kinematic maximum (compton edge)
mock_random.return_value = 1.0
for gamma_energy in [3., 10., 100.]:
expected = gammas.compton_edge(gamma_energy)
self.assertAlmostEqual(gammas.compton_energy_transfer(gamma_energy), expected, places=0)
# if random() returns 0, energy should approach 0
mock_random.return_value = 0.0
for gamma_energy in [3., 10., 100.]:
self.assertAlmostEqual(gammas.compton_energy_transfer(gamma_energy), 0.)
def test_compton_edge(self):
# Compton edges of well known gammas sources
# http://web.mit.edu/lululiu/Public/8.13/xray/TKA%20files/annihilation-Na.pdf
# Na-22
# 0.511 MeV: 0.344 MeV
# 1.27 MeV: 1.06 MeV
# http://www.spectrumtechniques.com/PDF/Compton%20Scattering%20Experiment%20by%20Prutchi.pdf
# Cs-137
# 0.662 MeV : 482 MeV
# Co-60
# 1.17 MeV: 0.96 MeV
# 1.33 MeV: 1.12 MeV
combinations = ((0.511, 0.340), (1.27, 1.06), (0.662, 0.482),
(1.17, 0.96), (1.33, 1.12))
for E, edge in combinations:
self.assertAlmostEqual(gammas.compton_edge(E), edge, places=2)
def test_compton_edge(self):
# Compton edges of well known gammas sources
# http://web.mit.edu/lululiu/Public/8.13/xray/TKA%20files/annihilation-Na.pdf
# Na-22
# 0.511 MeV: 0.344 MeV
# 1.27 MeV: 1.06 MeV
# http://www.spectrumtechniques.com/PDF/Compton%20Scattering%20Experiment%20by%20Prutchi.pdf
# Cs-137
# 0.662 MeV : 482 MeV
# Co-60
# 1.17 MeV: 0.96 MeV
# 1.33 MeV: 1.12 MeV
combinations = ((0.511, 0.340), (1.27, 1.06),
(0.662, 0.482),
(1.17, 0.96), (1.33, 1.12))
for E, edge in combinations:
self.assertAlmostEqual(gammas.compton_edge(E), edge, places=2)