FLUKA: EMFRAY
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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
For all SDUM
's except ORTHPOSI or ORTPOSTM:
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
1000.0 : ignored for Rayleigh, Compton, and acolinearity in
annihilation at rest, ortho-positronium 3 photon
annihilation at rest activated
1001.0 : both Rayleigh and binding corrections in Compton
activated, no acolinearity in annihilation at rest,
ortho-positronium 3 photon annihilation at rest
activated
1002.0 : Rayleigh and ortho-positronium 3 photon annihilation at
rest activated
1003.0 : binding corrections in Compton activated, no Rayleigh,
no acolinearity in annihilation at rest, ortho-positronium
3 photon annihilation at rest activated
1004.0 : all Rayleigh, binding corrections and profile function
in Compton activated, no acolinearity in annihilation at
rest, ortho-positronium 3 photon annihilation at rest
activated
1005.0 : Rayleigh and ortho-positronium 3 photon annihilation at
rest activated
1006.0 : binding corrections and profile function in Compton
activated, no Rayleigh, no acolinearity in annihilation at
rest, ortho-positronium 3 photon annihilation at rest
activated
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 1104.0.
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)
= ratio of para- and orto-positronium annihilation at rest,
meaningful only when orto-positronium 3 photon annihilation
at rest is activated (def. 378)
WHAT(6)
= Z0 + 1000 x Z1, where [Z0,Z1] is the interval of atomic
numbers to which apply what(5)
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.
For SDUM
= ORTHPOSI:
WHAT(1)
< 0.0 : resets the default (1.)
= 0.0 : ignored
> 0.0 : ortho-positronium 3 photon annihilation correction
factor (relative to the region one) for the n_th Fluka
medium
WHAT(2)
< 0.0 : resets the default (1.)
= 0.0 : ignored
> 0.0 : fraction of "normal" ortho-positronium 3 photon
annihilation for the n_th Fluka medium
WHAT(3)
: not used
WHAT(4)
= lower bound (or corresponding name) of the material indices in
which the previous parameters must be applied
("From material WHAT(4)
...")
Default
= 3.
WHAT(5)
= upper bound (or corresponding name) of the material indices in
which the previous parameters must be applied
("... to material WHAT(5)
...")
Default
= WHAT(4)
WHAT(6)
= step length in assigning indices
("...in steps of WHAT(6)
")
Default
= 1.
For SDUM
= ORTPOSTM:
WHAT(1)
< 0.0 : resets the default (def. 1.42 x10^-7 s)
= 0.0 : ignored
> 0.0 : ortho-positronium 3 photon annihilation normal component
time constant (s) for the n_th Fluka medium
WHAT(2)
< 0.0 : resets the default (def. 1.42 x10^-7 s)
= 0.0 : ignored
> 0.0 : ortho-positronium 3 photon annihilation anomalous component
time constant (s) for the n_th Fluka medium
WHAT(3)
< 0.0 : resets the default (oo s)
= 0.0 : ignored
> 0.0 : ortho-positronium to para-positronium transition time
constant (s) for the n_th Fluka medium
WHAT(4)
= lower bound (or corresponding name) of the material indices in
which the previous parameters must be applied
("From material WHAT(4)
...")
Default
= 3.
WHAT(5)
= upper bound (or corresponding name) of the material indices in
which the previous parameters must be applied
("... to material WHAT(5)
...")
Default
= WHAT(4)
WHAT(6)
= step length in assigning indices
("...in steps of WHAT(6)
")
Default
= 1.
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):
EMF
EMFRAY 1.0 8.0 12.0 4.0
EMFRAY 3.0 9.0 15.0 2.0
The same example, name-based:
EMF
EMFRAY 1.0 EightReg TwelvReg 4.0
EMFRAY 3.0 NineReg FifteenR 2.0
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