Activates a detailed treatment of photoelectric interactions and of
the following atomic deexcitation, with production of fluorescence
X-rays (and a rough treatment of Auger electrons)
See also EMF
This option, meaningful only if the EMF option has been requested
(explicitly or implicitly via option DEFAULTS), requires a special
unformatted file, pre-connected as logical input unit 13 (see Chap. 3}).
This file is delivered with the FLUKA code.
WHAT(1) >= 0: set fluorescence on
< 0 : set fluorescence off
= 0 : ignored
Default = -1.0 (no fluorescence) if option DEFAULTS is not used, or
if it is used with anything but CALORIMEtry, EM-CASCAde,
ICARUS or PRECISIOn.
If DEFAULTS is used with a SDUM value equal to one of the
latter, the default is 1.0 (fluorescence on).
WHAT(2) = lower bound of the material indices in which fluorescence is
activated
("From material WHAT(2)...")
Default = 3.
WHAT(3) = upper bound of the material indices in which fluorescence is
activated
("... to material WHAT(3)...")
Default = WHAT(2)WHAT(4) = step length in assigning indices
("...in steps of WHAT(4)")
Default = 1.
WHAT(5), WHAT(6), SDUM : not used
Default (option EMFFLUO not requested): fluorescence is not simulated
unless option DEFAULTS is chosen with SDUM = CALORIMEtry,
EM-CASCAde, ICARUS or PRECISIOn.
Notes:
1) Selection of EMFFLUO option is only meaningful for a material
defined with electron and photon cut-offs lower than the highest
K-edge in the elements constituents of that material.
2) When EMFFLUO is activated for a compound material, if the incident
photon energy is lower than the highest K-edge for any constituent
element, FLUKA uses separate parameterised representations of the
photoelectric cross-section between different edges of each
constituent element (all levels having a binding energy > 1 keV are
tabulated).
If the photon energy is higher than the highest K-edge, average
cross-sections for the compound are used, but FLUKA still samples a
single element on which to interact, in order to generate the
correct fluorescence photon or Auger electron.
Example:
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7...
EMF
EMFCUT 1.E-5 1.E-5 0.0 17. 18.
EMFFLUO 1.0 17. 18.
* In the above example, the user activates fluorescence production in
* Lead and Tantalum (standard FLUKA material numbers 17 and 18). The
* photon and electron cut-off has been set at 10 keV (the K-edge for
* Pb and Ta is of the order of 100 keV).
