PENELOPE 2003 - OECD Nuclear Energy Agency

150 Chapter 4. Electron/positron transport mechanics
e − , E= 5 0 0 k e V
100.0
s = 0 . 0 2 cm i n A l
1 Ε − 2
p (z) (cm −1 )
10.0
p (θ) (deg −1 )
1 Ε − 3
1.0
1 Ε − 4
e − , E= 5 0 0 k e V
s = 0 . 0 2 c m i n A l
0.1
−0.01 0.00 0.01 0.02
z (cm)
0 3 0 6 0 9 0 1 2 0 1 5 0 1 8 0
θ (deg)
e − , E= 5 0 0 k e V
6 Ε + 6
e − , E= 5 0 0 k e V
1 Ε− 5
s = 0 . 0 2 c m i n A l
s = 0 . 0 2 cm i n A l
p (E) (eV −1 )
1 Ε− 6
D (z) (eV/cm)
4 Ε + 6
1 Ε− 7
2Ε + 6
×5 0
1 Ε− 8
2Ε+5 3 Ε+5 4 Ε+5
E (eV)
0Ε + 0
−0.02 −0.01 0.00 0.01 0.02
z (cm)
Figure 4.5: Results from the simulations of 500 keV electrons in aluminium described in the
text. Crosses, detailed simulation; continuous curves, mixed simulation. p(z) is the PDF of
the z-coordinate of the final electron position, after travelling the prescribed 200 µm. p(θ) and
p(E) are the PDFs of the direction of motion (specified by the polar angle θ) and the kinetic
energy E of the electrons at the end of the simulated tracks. The function D(z) represents the
“depth-dose” function, i.e. the average energy deposited in the material per unit length along
the z-direction (the residual energy at the end of the track is not included in the dose).