Here we provide code and output which verifies and validates the 25mm collimator simulation. We're using simulation phase space file output and input to check the validity of the result. Geometry of the source is 12mm in length and activity of the source 120Ci. Secondary collimator is shifted relative to primary/source by 0.13 degrees.
In [22]:
import math
import matplotlib
import numpy as np
import matplotlib.pyplot as plt
import BEAMphsf
import beam_loader
import H1Dn
import H1Du
import ListTable
%matplotlib inline
In [23]:
def cm2mm(value):
"""
converts cm to mm
"""
return value*10.0
First, set filename to what we want to examine and read PhSF header
In [24]:
C = 25
phsfname = "C" + str(C) + "GP3p13" + ".egsphsp1"
phsfname = "../" + phsfname
print ("We're reading the {1}mm phase space file = {0}".format(phsfname, C))
Checking PhSF header parameters
In [25]:
m, NPPHSP, NPHOTPHSP, EKMAX, EKMIN, NINCP = beam_loader.read_header_byname(phsfname)
print ("We're reading the {1}mm phase space file = {0}".format(phsfname, C))
if m == beam_loader.SHORT:
print("We have short MODE0 phase space file".format(m))
elif m == beam_loader.LONG:
print("We have long MODE2 phase space file".format(m))
print("Total nof of particle records: {0}".format(NPPHSP))
print("Total nof of photon records: {0}".format(NPHOTPHSP))
print("Maximum kinetic energy: {0} MeV".format(EKMAX))
print("Minimum kinetic energy: {0} MeV".format(EKMIN))
print("Number of original particles: {0}".format(NINCP))
print("Yield: {0}".format(NPHOTPHSP/NINCP))
In [26]:
events, nof_photons, nof_electrons, nof_positrons = beam_loader.load_events(phsfname, -1)
print("Number of loaded events: {0}".format(len(events)))
print("Number of loaded photons: {0}".format(nof_photons))
print("Number of loaded electrons: {0}".format(nof_electrons))
print("Number of loaded positrons: {0}".format(nof_positrons))
Convert all spatial coordinates to mm
In [27]:
evts = list()
for event in events:
wt = event[0]
e = event[1]
x = cm2mm(event[2])
y = cm2mm(event[3])
zl = cm2mm(event[4])
wx = event[5]
wy = event[6]
wz = event[7]
evts.append(((wt, e, x, y, zl, wx, wy, wz)))
events = evts
We expect energy spectrum to be scattering background together with peaks δ(E-1.17) and δ(E-1.33). Below we'trying to prove this statement. We will draw the distributions and histograms to estimate influence of the background scattering and get the data about δ-peaks
We're building scale with 5 bins in the region between 1.17 and 1.33 MeV, all other bins below 1.17 are of about the same size as those 5
In [28]:
# make scale with explicit bins at 1.17 MeV and 1.33 MeV
nbins = 5
scale = BEAMphsf.make_energy_scale(nbins, lo = 0.01, me = 1.1700001, hi = 1.3300001)
he = H1Dn.H1Dn(scale)
for e in events:
WT = e[0]
E = e[1]
he.fill(E, WT)
print("Number of events in histogram: {0}".format(he.nof_events()))
print("Integral in histogram: {0}".format(he.integral()))
print("Underflow bin: {0}".format(he.underflow()))
print("Overflow bin: {0}".format(he.overflow()))
Underflow bin is close to empty, as well as Overflow bin. This is good because we do not expect events beyond 1.33MeV and below ECUT
In [29]:
X = []
Y = []
W = []
scale = he.x()
n = len(scale)
norm = 1.0/he.integral()
sum = 0.0
for k in range (-1, he.size()+1):
x = 0.0
w = (he.lo() - x)
if k == he.size():
w = (scale[-1]-scale[-2])
x = he.hi()
elif k >= 0:
w = (scale[k+1] - scale[k])
x = scale[k]
d = he[k] # data from bin with index k
y = d[0] / w # first part of bin is collected weights
y = y * norm
X.append(x)
Y.append(y)
W.append(w)
sum += y*w
print("PDF normalization: {0}".format(sum))
E133_5 = Y[-2]
E117_5 = Y[-2-nbins]
p1 = plt.bar(X, Y, W, color='r')
plt.xlabel('Energy(MeV)')
plt.ylabel('PDF of the photons')
plt.title('Energy distribution')
plt.grid(True);
plt.tick_params(axis='x', direction='out')
plt.tick_params(axis='y', direction='out')
plt.show()
In [30]:
# saving peak values
print("Peak PDF value at 1.33 MeV: {0}".format(E133_5))
print("Peak PDF value at 1.17 MeV: {0}".format(E117_5))
We're building scale with 10 bins in the region between 1.17 and 1.33 MeV, all other bins below 1.17 are of about the same size as those 10
In [31]:
# make scale with explicit bins at 1.17 MeV and 1.33 MeV
nbins = 10
scale = BEAMphsf.make_energy_scale(nbins, lo = 0.01, me = 1.1700001, hi = 1.3300001)
he = H1Dn.H1Dn(scale)
for e in events:
WT = e[0]
E = e[1]
he.fill(E, WT)
print("Number of events in histogram: {0}".format(he.nof_events()))
print("Integral in histogram: {0}".format(he.integral()))
print("Underflow bin: {0}".format(he.underflow()))
print("Overflow bin: {0}".format(he.overflow()))
Underflow bin is close to empty, as well as Overflow bin. This is good because we do not expect events beyond 1.33MeV and below ECUT
In [32]:
X = []
Y = []
W = []
scale = he.x()
n = len(scale)
norm = 1.0/he.integral()
sum = 0.0
for k in range (-1, he.size()+1):
x = 0.0
w = (he.lo() - x)
if k == he.size():
w = (scale[-1]-scale[-2])
x = he.hi()
elif k >= 0:
w = (scale[k+1] - scale[k])
x = scale[k]
d = he[k] # data from bin with index k
y = d[0] / w # first part of bin is collected weights
y = y * norm
X.append(x)
Y.append(y)
W.append(w)
sum += y*w
print("PDF normalization: {0}".format(sum))
E133_10 = Y[-2]
E117_10 = Y[-2-nbins]
p1 = plt.bar(X, Y, W, color='r')
plt.xlabel('Energy(MeV)')
plt.ylabel('PDF of the photons')
plt.title('Energy distribution')
plt.grid(True);
plt.tick_params(axis='x', direction='out')
plt.tick_params(axis='y', direction='out')
plt.show()
In [33]:
# saving peak values
print("Peak PDF value at 1.33 MeV: {0}".format(E133_10))
print("Peak PDF value at 1.17 MeV: {0}".format(E117_10))
We're building scale with 20 bins in the region between 1.17 and 1.33 MeV, all other bins below 1.17 are of about the same size as those 20.
In [34]:
# make scale with explicit bins at 1.17 MeV and 1.33 MeV
nbins = 20
scale = BEAMphsf.make_energy_scale(nbins, lo = 0.01, me = 1.1700001, hi = 1.3300001)
he = H1Dn.H1Dn(scale)
for e in events:
WT = e[0]
E = e[1]
he.fill(E, WT)
print("Number of events in histogram: {0}".format(he.nof_events()))
print("Integral in histogram: {0}".format(he.integral()))
print("Underflow bin: {0}".format(he.underflow()))
print("Overflow bin: {0}".format(he.overflow()))
Underflow bin is close to empty, as well as Overflow bin. This is good because we do not expect events beyond 1.33MeV and below ECUT
In [35]:
X = []
Y = []
W = []
scale = he.x()
n = len(scale)
norm = 1.0/he.integral()
sum = 0.0
for k in range (-1, he.size()+1):
x = 0.0
w = (he.lo() - x)
if k == he.size():
w = (scale[-1]-scale[-2])
x = he.hi()
elif k >= 0:
w = (scale[k+1] - scale[k])
x = scale[k]
d = he[k] # data from bin with index k
y = d[0] / w # first part of bin is collected weights
y = y * norm
X.append(x)
Y.append(y)
W.append(w)
sum += y*w
print("PDF normalization: {0}".format(sum))
E133_20 = Y[-2]
E117_20 = Y[-2-nbins]
p1 = plt.bar(X, Y, W, color='r')
plt.xlabel('Energy(MeV)')
plt.ylabel('PDF of the photons')
plt.title('Energy distribution')
plt.grid(True);
plt.tick_params(axis='x', direction='out')
plt.tick_params(axis='y', direction='out')
plt.show()
In [36]:
# saving peak values
print("Peak PDF value at 1.33 MeV: {0}".format(E133_20))
print("Peak PDF value at 1.17 MeV: {0}".format(E117_20))
We would compare peak values at 10 bins and at 5 bins. The presence of δ-peaks means that with doubling number of bins we shall expect the roughly doubling the peak values.
In [37]:
table = ListTable.ListTable()
table.append(["Nbins", "E=1.17", "E=1.33"])
table.append(["", "MeV", "MeV"])
table.append([5, 1.0, 1.0])
table.append([10, E133_10/E133_5, E133_10/E133_5])
table.append([20, E133_20/E133_5, E133_20/E133_5])
table
Out[37]:
The result is as expected. Only few percent of the values in the 1.33 and 1.17 MeV bins are due to scattered radiation. Most values are coming from primary source and are δ-peaks in energy.
Here we will plot spatial distribution of the particles, projected from collimator exit position to the isocenter location at 38cm
In [38]:
Znow = 200.0 # we at 000mm at the cooolimator exit
Zshot = 360.0 # shot isocenter is at 380mm
# radial, X and Y, all units in mm
hr = H1Du.H1Du(120, 0.0, 40.0)
hx = H1Du.H1Du(128, -32.0, 32.0)
hy = H1Du.H1Du(128, -32.0, 32.0)
for e in events:
WT = e[0]
xx, yy, zz = BEAMphsf.move_event(e, Znow, Zshot)
#xx = e[2]
#yy = e[3]
#zz = e[4]
r = math.sqrt(xx*xx + yy*yy)
hr.fill(r, WT)
hx.fill(xx, WT)
hy.fill(yy, WT)
print("Number of events in R histogram: {0}".format(hr.nof_events()))
print("Integral in R histogram: {0}".format(hr.integral()))
print("Underflow bin: {0}".format(hr.underflow()))
print("Overflow bin: {0}\n".format(hr.overflow()))
print("Number of events in X histogram: {0}".format(hx.nof_events()))
print("Integral in X histogram: {0}".format(hx.integral()))
print("Underflow bin: {0}".format(hx.underflow()))
print("Overflow bin: {0}\n".format(hx.overflow()))
print("Number of events in Y histogram: {0}".format(hy.nof_events()))
print("Integral in Y histogram: {0}".format(hy.integral()))
print("Underflow bin: {0}".format(hy.underflow()))
print("Overflow bin: {0}".format(hy.overflow()))
In [39]:
X = []
Y = []
W = []
norm = 1.0/hr.integral()
sum = 0.0
st = hr.step()
for k in range (0, hr.size()+1):
r_lo = hr.lo() + float(k) * st
r_hi = r_lo + st
r = 0.5*(r_lo + r_hi)
ba = math.pi * (r_hi*r_hi - r_lo*r_lo) # bin area
d = hr[k] # data from bin with index k
y = d[0] / ba # first part of bin is collected weights
y = y * norm
X.append(r)
Y.append(y)
W.append(st)
sum += y * ba
print("PDF normalization: {0}".format(sum))
p1 = plt.bar(X, Y, W, 0.0, color='b')
plt.xlabel('Radius(mm)')
plt.ylabel('PDF of the photons')
plt.title('Radial distribution')
plt.grid(True);
plt.tick_params(axis='x', direction='out')
plt.tick_params(axis='y', direction='out')
plt.show()
NB: peak at the far right above 40mm is overflow bin
In [40]:
X = []
Y = []
W = []
norm = 1.0/hx.integral()
sum = 0.0
st = hx.step()
for k in range (0, hx.size()):
x_lo = hx.lo() + float(k)*st
x_hi = x_lo + st
x = 0.5*(x_lo + x_hi)
d = hx[k] # data from bin with index k
y = d[0] / st # first part of bin is collected weights
y = y * norm
X.append(x)
Y.append(y)
W.append(st)
sum += y*st
print("PDF normalization: {0}".format(sum))
p1 = plt.bar(X, Y, W, color='b')
plt.xlabel('X(mm)')
plt.ylabel('PDF of the photons')
plt.title('X distribution')
plt.grid(True);
plt.tick_params(axis='x', direction='out')
plt.tick_params(axis='y', direction='out')
plt.show()
In [41]:
X = []
Y = []
W = []
norm = 1.0/hy.integral()
sum = 0.0
st = hy.step()
for k in range (0, hy.size()):
x_lo = hy.lo() + float(k)*st
x_hi = x_lo + st
x = 0.5*(x_lo + x_hi)
d = hy[k] # data from bin with index k
y = d[0] / st # first part of bin is collected weights
y = y * norm
X.append(x)
Y.append(y)
W.append(st)
sum += y*st
print("PDF normalization: {0}".format(sum))
p1 = plt.bar(X, Y, W, color='b')
plt.xlabel('Y(mm)')
plt.ylabel('PDF of the photons')
plt.title('Y distribution')
plt.grid(True);
plt.tick_params(axis='x', direction='out')
plt.tick_params(axis='y', direction='out')
plt.show()
We find spatial distribution to be consistent with the collimation setup
Here we plot particles angular distribution for all three directional cosines, at the collimator exit. We expect angular distribution to fill collimation angle which is close to 0.017 radians (0.5x15/380).
In [42]:
# angular, WZ, WX and WY, all units in radians
h_wz = H1Du.H1Du(100, 1.0 - 0.05, 1.0)
h_wx = H1Du.H1Du(110, -0.055, 0.055)
h_wy = H1Du.H1Du(110, -0.055, 0.055)
for e in events:
WT = e[0]
wx = e[5]
wy = e[6]
wz = e[7]
h_wz.fill(wz, WT)
h_wx.fill(wx, WT)
h_wy.fill(wy, WT)
print("Number of events in WZ histogram: {0}".format(h_wz.nof_events()))
print("Integral in WZ histogram: {0}".format(h_wz.integral()))
print("Underflow bin: {0}".format(h_wz.underflow()))
print("Overflow bin: {0}\n".format(h_wz.overflow()))
print("Number of events in WX histogram: {0}".format(h_wx.nof_events()))
print("Integral in WX histogram: {0}".format(h_wx.integral()))
print("Underflow bin: {0}".format(h_wx.underflow()))
print("Overflow bin: {0}\n".format(h_wx.overflow()))
print("Number of events in WY histogram: {0}".format(h_wy.nof_events()))
print("Integral in WY histogram: {0}".format(h_wy.integral()))
print("Underflow bin: {0}".format(h_wy.underflow()))
print("Overflow bin: {0}".format(h_wy.overflow()))
In [43]:
X = []
Y = []
W = []
norm = 1.0/h_wz.integral()
sum = 0.0
st = h_wz.step()
for k in range (0, h_wz.size()+1):
x_lo = h_wz.lo() + float(k)*st
x_hi = x_lo + st
x = 0.5*(x_lo + x_hi)
d = h_wz[k] # data from bin with index k
y = d[0] / st # first part of bin is collected weights
y = y * norm
X.append(x)
Y.append(y)
W.append(st)
sum += y*st
print("PDF normalization: {0}".format(sum))
p1 = plt.bar(X, Y, W, color='g')
plt.xlabel('WZ')
plt.ylabel('PDF of the photons')
plt.title('Angular Z distribution')
plt.grid(True);
plt.tick_params(axis='x', direction='out')
plt.tick_params(axis='y', direction='out')
plt.show()
In [44]:
X = []
Y = []
W = []
norm = 1.0/h_wx.integral()
sum = 0.0
st = h_wx.step()
for k in range (0, h_wx.size()):
x_lo = h_wx.lo() + float(k)*st
x_hi = x_lo + st
x = 0.5*(x_lo + x_hi)
d = h_wx[k] # data from bin with index k
y = d[0] / st # first part of bin is collected weights
y = y * norm
X.append(x)
Y.append(y)
W.append(st)
sum += y*st
print("PDF normalization: {0}".format(sum))
p1 = plt.bar(X, Y, W, color='g')
plt.xlabel('WX')
plt.ylabel('PDF of the photons')
plt.title('Angular X distribution')
plt.grid(True);
plt.tick_params(axis='x', direction='out')
plt.tick_params(axis='y', direction='out')
plt.show()
In [45]:
X = []
Y = []
W = []
norm = 1.0/h_wy.integral()
sum = 0.0
st = h_wy.step()
for k in range (0, h_wy.size()):
x_lo = h_wy.lo() + float(k)*st
x_hi = x_lo + st
x = 0.5*(x_lo + x_hi)
d = h_wy[k] # data from bin with index k
y = d[0] / st # first part of bin is collected weights
y = y * norm
X.append(x)
Y.append(y)
W.append(st)
sum += y*st
print("PDF normalization: {0}".format(sum))
p1 = plt.bar(X, Y, W, color='g')
plt.xlabel('WY')
plt.ylabel('PDF of the photons')
plt.title('Angular Y distribution')
plt.grid(True);
plt.tick_params(axis='x', direction='out')
plt.tick_params(axis='y', direction='out')
plt.show()
We find photon angular distribution to be consistent with the collimation setup
After plotting and analyzing photons energy, spatial and angular distribution, we could conclude that it is consistent with simulation Co60 source, sending particles through collimation system of 25mm collimation spot at 360mm isocenter.