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EMFRAY


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

    See also EMF

     
WHAT(1)
= 1.0 : both Rayleigh scattering and Compton binding corrections are activated, no Compton profile function 2.0 : only Rayleigh scattering activated 3.0 : only Compton binding corrections are activated 4.0 : all Rayleigh, binding corrections, and profile function in Compton activated 5.0 : only Rayleigh scattering is activated 6.0 : only binding corrections and profile function in Compton are activated, no Rayleigh 0.0 : ignored < 0.0 : no Rayleigh scattering and neither binding corrections nor Compton profile function
Default
: if option DEFAULTS is used with
SDUM
= NEW-DEFAults, or it is not used, the default is 3.0. If it is used with
SDUM
= CALORIMEtry, EM-CASCAde, ICARUS, HADROTHErapy or PRECISIOn, the default is 4.0. With any other value of
SDUM
, the default is 0.0.
WHAT(2)
= lower bound (or corresponding name) of the region indices where Rayleigh scattering and/or Compton binding corrections and/or Compton profile function 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 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
= NEW-DEFAults or HADROTHErapy, binding corrections in Compton scattering are activated, but not Rayleigh scattering. If DEFAULTS is not used, or is used with
SDUM
= CALORIMEtry, EM-CASCAde, ICARUS or PRECISIOn, both are activated. With any other value of
SDUM
, binding corrections and Rayleigh scattering are not 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 EMFRAY 1.0 EightReg TwelvReg 4.0 EMFRAY 3.0 NineReg FifteenR 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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