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EMFRAY


    Activates Rayleigh (coherent) scattering, Compton binding and profile
    function corrections, and acolinearity in annihilation at rest in selected
    regions. Only meaningful when the EMF option has been requested, explicitly
    or implicitly via option DEFAULTS.

    See also EMF

     
WHAT(1)
< 0.0 : no Rayleigh scattering and neither binding corrections nor Compton profile function, no acolinearity in annihilation at rest = 0.0 : ignored 1.0 : both Rayleigh scattering and Compton binding corrections are activated, no Compton profile function, no acolinearity in annihilation at rest, no ortho-positronium 3 photon annihilation at rest 2.0 : only Rayleigh scattering is activated, naive Compton, no ortho-positronium 3 photon annihilation at rest 3.0 : only Compton binding corrections are activated 4.0 : all Rayleigh, binding corrections, and profile function in Compton activated, no acolinearity in annihilation at rest, no ortho-positronium 3 photon annihilation at rest 5.0 : only Rayleigh scattering is activated, naive Compton, no acolinearity in annihilation at rest, no ortho-positronium 3 photon annihilation at rest 6.0 : only binding corrections and profile function in Compton are activated, no Rayleigh, no acolinearity in annihilation at rest, no ortho-positronium 3 photon annihilation at rest 100.0 : ignored for Rayleigh and Compton, acolinearity in annihilation at rest activated, no ortho-positronium 3 photon annihilation at rest 101.0 : both Rayleigh scattering and Compton binding corrections are activated, no Compton profile function, acolinearity in annihilation at rest activated, no ortho-positronium 3 photon annihilation at rest 102.0 : only Rayleigh scattering and acolinearity in annihilation at rest activated, naive Compton, no ortho-positronium 3 photon annihilation at rest 103.0 : binding corrections in Compton only and acolinearity in annihilation at rest activated, no Rayleigh, no ortho-positronium 3 photon annihilation at rest 104.0 : all Rayleigh, binding corrections and profile function in Compton, acolinearity in annihilation at rest activated, no ortho-positronium 3 photon annihilation at rest 105.0 : Rayleigh and acolinearity in annihilation at rest activated, naive Compton, no ortho-positronium 3 photon annihilation at rest 106.0 : binding corrections and profile function in Compton are activated, no Rayleigh, acolinearity in annihilation at rest activated, no ortho-positronium 3 photon annihilation at rest 1100.0 : ignored for Rayleigh and Compton, acolinearity in annihilation at rest and ortho-positronium 3 photon annihilation at rest activated 1101.0 : both Rayleigh and binding corrections in Compton activated, acolinearity in annihilation at rest activated, ortho-positronium 3 photon annihilation at rest activated * 1102.0 : Rayleigh and acolinearity in annihilation at rest activated, naive Compton, ortho-positronium 3 photon annihilation at rest activated 1103.0 : binding corrections in Compton only and acolinearity in annihilation at rest activated, no Rayleigh, ortho- -positronium 3 photon annihilation at rest activated * 1104.0 : all Rayleigh, binding corrections and profile function function in Compton, acolinearity in annihilation at rest activated, ortho-positronium 3 photon annihilation at rest activated 1105.0 : Rayleigh and acolinearity in annihilation at rest activated, naive Compton, ortho-positronium 3 photon annihilation at rest activated 1106.0 : binding corrections and profile function in Compton activated, no Rayleigh, acolinearity in annihilation at rest activated, ortho-positronium 3 photon annihilation at rest activated
Default
: if option DEFAULTS is used with
SDUM
= CALORIMEtry, EM-CASCAde, ICARUS, HADROTHErapy, PRECISIOn or DAMAGE the default is 104.0. With any other value of
SDUM
, the default is 3.0.
WHAT(2)
= lower bound (or corresponding name) of the region indices where Rayleigh scattering and/or Compton binding corrections and/or Compton profile function and/or acolinearity in annihilation at rest are requested. ("From region
WHAT(2)
...")
Default
= 2.0
WHAT(3)
= upper bound (or corresponding name) of the region indices where Rayleigh scattering and/or Compton binding corrections and/or Compton profile function and/or acolinearity in annihilation at rest are requested. ("...to region
WHAT(3)
...")
Default
=
WHAT(2)
WHAT(4)
= step length in assigning indices. ("...in steps of
WHAT(4)
").
Default
= 1.0
WHAT(5)
,
WHAT(6)
,
SDUM
: not used
Default
(option EMFRAY not requested): if option DEFAULTS is used with
SDUM
= CALORIMEtry, EM-CASCAde, ICARUS, HADROTHErapy, PRECISIOn or DAMAGE, Rayleigh scattering, binding corrections and profile function in Compton, and acolinearity in annihilation at rest are activated. With any other value of
SDUM
or if option DEFAULTS is not used, only binding corrections in Compton scattering are activated.
Notes:
1) The treatment of Rayleigh scattering is rather poor for non monoatomic materials (it assumes additivity and does not take into account important molecular effects). However, Rayleigh scattering, in general, has little effect on energy deposition and on particle transport. 2) The full treatment of electron binding and motion in Compton scattering (referred above as "binding corrections and profile function") is now available. It is particular important for low energies and/or heavy materials, and in general for all problems where the best accuracy for photon transport is requested. Example (number based):
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7...
EMF EMFRAY 1.0 8.0 12.0 4.0 EMFRAY 3.0 9.0 15.0 2.0
* In the above example, Compton binding corrections are requested in
* regions 8 to 15, excluding regions 10 and 14.
* Rayleigh scattering is requested only in regions 8 and 12
The same example, name-based: EMF EMFRAY 1.0 EightReg TwelvReg 4.0 EMFRAY 3.0 NineReg FifteenR 2.0

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