THE EGS5 CODE SYSTEM

Math FORTRAN Program
Table 2.1 (cont.)
Definition
26. Σ P macroscopic cross section
(probability of interaction/cm)
= N a ρσ/M
27. ˘Σ P macroscopic cross section
(in X0 −1 units) = X 0 Σ
28. ρ RHO PE material density (g/cm 3 )
29. N e NE PE number of elements in
the material
30. Z i Z(I) P atomic number of the ith element
of the material
31. A i WA(I) P atomic weight of the ith element
of the material (g/mole)
32. p i PZ(I) P proportion by number of the ith
element in the material ∝ ρ i /A i
33. ρ i RHOZ(I) P proportion by weight of the ith
element in the material ∝ p i A i
34. M WM P molecular weight (g/mole)
= ∑ N e
i=1 p iA i
35. C M ZC P molecular charge (electrons/
molecule) = ∑ N e
i=1 p iZ i
36. n EDEN P electron density (electrons/cm 3 )
= N a ρC M /M
37. X 0 RLC PE radiation length
= (N a ρ4αr0 2(Z AB − Z F )/M) −1
∑
38. Z T ZT P Ne
i=1 p iZ i (Z i + ξ i )
∑
39. Z B ZB P
Ne
i=1 p iZ i (Z i + ξ i )ln Z −1/3
∑ i
40. Z F ZF P Ne
i=1 p iZ i (Z i + ξ i )f c (Z i )
∑
41. Z S ZS P Ne
i=1 p iZ i (Z i + ξ MS )
∑
42. Z E ZE P Ne
i=1 p iZ i (Z i + ξ MS )ln Z −2/3
i
43. Z X ZX P
∑ Ne
i=1 p iZ i (Z i + ξ MS )
×ln (1 + 3.34(αZ i ) 2 )
44. Z A ZA P Z T ln 183
45. Z G ZG P Z B /Z T
46. Z P ZP P Z B /Z A
47. Z V ZV P (Z B − Z F )/Z T
48. Z U ZU P (Z B − Z F )/Z A
Note: The next four are used in EGS directly and computed in MIX
49. b c BLCC PE ‘6680’ ρZ S exp(Z E /Z S ) X 0
50. χ cc XCC PE
/(M exp(Z X /Z S ))
(‘22.9’/RADDEG) √ Z S ρX 0 /M
51. t eff0 TEFFO PE
52. χ r0 XRO PE
(exp(B min )/B min )/b
√ c
χ cc teff0 B min
53. ξ MS FUDGEMS P constant used to account for
multiple scattering of atomic
electrons
35