def test_branch_ratio():
assert_equal(data.branch_ratio('H1', 'H1'), 1.0)
assert_equal(data.branch_ratio(922350001, 922350000), 1.0)
assert_equal(data.branch_ratio(922350001, 922360000), 0.0)
assert_equal(data.branch_ratio(611460000, 621460000), 0.34)
children = data.decay_children('U235')
for child in children:
obs = data.branch_ratio('U235', child)
assert_true(obs >= 0.0 and obs <= 1.0)
def k_a_from_hl(chain, short=1e-16, small=1e-16):
hl = np.array([half_life(n, False) for n in chain])
hl = hl[~np.isnan(hl)]
outerdiff = hl - hl[:, np.newaxis]
outerzeros = outerdiff == 0.0
a = -1.0 / hl
gamma = np.prod([branch_ratio(p, c) for p, c in zip(chain[:-1], chain[1:])])
if gamma == 0.0 or np.isnan(gamma):
return None, None, None
ends_stable = np.isinf(hl[-1])
k = (
k_from_hl_stable(hl, gamma, outerdiff, outerzeros)
if ends_stable
else k_from_hl_unstable(hl, gamma, outerdiff, outerzeros)
)
t_term = np.zeros(len(k), dtype=bool)
asmask = almost_stable_mask(hl, k)
if np.any(asmask):
# handle case some nuclide is effectively stable and
# we obtained an overflow through the normal method
k, a, t_term = (
k_almost_stable(hl, a, gamma, asmask)
if ends_stable
else k_almost_unstable(hl, a, gamma, asmask)
)
else:
k, a, t_term = hl_degeneracy(hl, k, a, outerzeros)
# filtering makes compiling faster by pre-ignoring negligible species
# in this chain. They'll still be picked up in their own chains.
mask = k_filter(k, t_term, small=small)
if mask.sum() == 0:
return None, None, None
return k[mask], a[mask], t_term[mask]
def _build_matrix(N):
"""This function builds burnup matrix, A. Decay only."""
A = np.zeros((len(N), len(N)))
# convert N to id form
N_id = []
for i in range(len(N)):
if isinstance(N[i], str):
ID = nucname.id(N[i])
else:
ID = N[i]
N_id.append(ID)
sds = SimpleDataSource()
# Decay
for i in range(len(N)):
A[i, i] -= decay_const(N_id[i])
# Find decay parents
for k in range(len(N)):
if N_id[i] in decay_children(N_id[k]):
A[i,
k] += branch_ratio(N_id[k], N_id[i]) * decay_const(N_id[k])
return A
def graph(nuc):
"""Returns a graphviz Digraph object for the decay chain starting from nuc."""
i = nucname.name(nuc)
name = nucname.name(nuc)
dot = Digraph(comment='Decay chain for ' + nuc)
dot.node(name)
nodes_seen = {name}
kids = data.decay_children(i)
from_to = {(i, j) for j in kids}
edges_seen = set()
while len(from_to) != 0:
new_from_to = set()
for ft in from_to:
i, j = ft
jname = nucname.name(j)
if jname not in nodes_seen:
dot.node(jname)
nodes_seen.add(jname)
if ft not in edges_seen:
iname = nucname.name(i)
try:
label = rxname.name(i, j, 'decay')
except RuntimeError:
label = 'sf'
label = PRETTY_RX.get(label, label)
br = data.branch_ratio(i, j)
if br < 1.0:
label += ', br={0:.3}'.format(br)
dot.edge(iname, jname, label=label)
edges_seen.add(ft)
kids = data.decay_children(j)
new_from_to |= {(j, k) for k in kids}
from_to = new_from_to
return dot
def add_child_decays(nuc, symbols):
try:
childname = nucname.name(nuc)
except RuntimeError:
return
for rx in DECAY_RXS:
try:
parent = rxname.parent(nuc, rx, b'decay')
except RuntimeError:
continue
if data.branch_ratio(parent, nuc) < 1e-16:
continue
parname = nucname.name(parent)
symbols['lambda_' + parname] = data.decay_const(parent)
gamma = 'gamma_{0}_{1}_{2}'.format(parname, childname, rx)
symbols[gamma] = data.branch_ratio(parent, nuc)
def test_branch_ratio():
assert_equal(data.branch_ratio("H1", "H1"), 1.0)
assert_equal(data.branch_ratio(922350001, 922350000), 1.0)
assert_equal(data.branch_ratio(922350001, 922360000), 0.0)
assert_equal(data.branch_ratio(611460000, 621460000), 0.34299999999999997)
children = data.decay_children("U235")
for child in children:
obs = data.branch_ratio("U235", child)
assert_true(obs >= 0.0 and obs <= 1.0)
# There was a bug with metastable ids being dropped prematurely,
# which would then lead to the branch ratio for the ground state being reported
# Obviously, this was bad, so here is a test.
assert_equal(data.branch_ratio("Se86", "Br86M"), 0.0)
# Not all isomeric transitions have a 100% branch ratio
assert_equal(data.branch_ratio(932400001, 932400000), 0.0012)
def _decay_branches(self, nuc):
"""Returns a dictionary that contains the decay children of nuc as keys
to the branch ratio of that child's decay process.
Parameters
----------
nuc : int
Name of parent nuclide to get decay children of.
Returns
-------
decay_branches : dictionary
Keys are decay children of nuc in zzaaam format.
Values are the branch ratio of the decay child.
"""
decay_branches = {}
children = data.decay_children(nuc)
for child in children:
decay_branches[child] = data.branch_ratio(nuc, child)
return decay_branches
def _decay_branches(self, nuc):
"""Returns a dictionary that contains the decay children of nuc as keys
to the branch ratio of that child's decay process.
Parameters
----------
nuc : int
Name of parent nuclide to get decay children of.
Returns
-------
decay_branches : dictionary
Keys are decay children of nuc in zzaaam format.
Values are the branch ratio of the decay child.
"""
decay_branches = {}
children = data.decay_children(nuc)
for child in children:
decay_branches[child] = data.branch_ratio(nuc, child)
return decay_branches
def calc_decay_depletion(isotopes, DATA):
# Create dictionary to keep track of daughters
daughter_flags = dict()
for iso in isotopes:
daughter_flags[iso] = False
dec_depletion = np.zeros([len(isotopes) + 2, len(isotopes) + 2])
# Decay from j to i
for i, iso_i in enumerate(isotopes):
for j, iso_j in enumerate(isotopes):
# Off-diagonal terms
if j < i or j > i:
# if j < i:
ratio = data.branch_ratio(iso_j, iso_i)
# print('print(iso_j, iso_i, ratio)')
# print(iso_j, iso_i, ratio)
# print(iso_j, iso_i, ratio)
if ratio > 0:
decay_const = data.decay_const(iso_j)
dec_depletion[i, j] -= ratio * decay_const
daughter_flags[iso_j] = True
# if iso_j=='932340':
# print(iso_j, iso_i, data.branch_ratio(iso_j,iso_i))
# Diagonal terms
elif i == j:
# Add decay constant here
# print(iso_j, data.half_life(iso_j))
dec_depletion[i, j] += data.decay_const(iso_j)
for i, iso in enumerate(isotopes):
if not daughter_flags[iso] and dec_depletion[i, i] != 0:
print("Warning: no decay daughter for ", iso)
dec_depletion[-2, i] += -dec_depletion[i, i]
return dec_depletion
def test_branch_ratio():
assert_equal(data.branch_ratio('H1', 'H1'), 1.0)
assert_equal(data.branch_ratio(922350001, 922350000), 1.0)
assert_equal(data.branch_ratio(922350001, 922360000), 0.0)
assert_equal(data.branch_ratio(611460000, 621460000), 0.34)
from pyne import data, nucname
import numpy as np
print(data.decay_const('U-235'))
print(data.decay_const('922350'))
print(data.decay_const('922350000'))
print(data.branch_ratio('932390000','942390000', use_metastable=False))
print(data.decay_children('932390000'))
print(data.decay_const('942420000'))
print(data.decay_children('942420000'))
print(np.log(2)/data.decay_const('922340000')/3.15e7)
print('-------Np-239 to Pu-239 test--------')
print(data.decay_const('932390'))
print(data.decay_children('932390'))
print(data.decay_const('932390'))
print(data.decay_children('932390'))
print(data.branch_ratio(932390,942390))
print('-------U-240 decay test--------')
print(np.log(2)/data.decay_const('922400')/3600)
print(data.branch_ratio('922400','932400', use_metastable=False))
print('-----U234 Capture Test-----')
print(float('922350')-float('922340') == 10)
print('-----Mass Test-----')
print(nucname.anum('922350'))
print('-----Name Test-----')