Last version:
FLUKA 2021.2.1, July 26th 2021
(last respin )
flair-2.3-0b 30-Jul-2021


-- Fluka Release
( 30.07.2021 )

FLUKA 2021.2.1 has been released.
Fluka Major Release 18.05.2021 FLUKA 2021.2.0 has been released.
Congratulations from INFN: ,
Dear Paola,
I wish to congratulate you and all the authors and collaborators for this new Fluka release, which looks at the future and confirms the support of INFN in the development and continuous improvement of this code.
best regards
Diego Bettoni
INFN Executive Committee

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allows to alter material density for dE/dx and nuclear processes on a region-by-region basis


     WHAT(1) >= 0.0 : density scaling factor for charged particle ionisation
                      processes (dE/dx, delta ray production, M\oller and Bhabha
              = 0.0 : ignored
              < 0.0 : reset to default
              Default: 1.0

     WHAT(2) >= 0.0 : density scaling factor for all other processes
              = 0.0 : ignored
              < 0.0 : reset to default
              Default: 1.0

     WHAT(3): not used

     WHAT(4): lower index bound (or corresponding name) of regions where the
              scaling factors shall apply
               "From region WHAT(4)..."
              Default: 2.0

     WHAT(5): upper index bound (or corresponding name) of regions where the
              scaling factors shall apply
               " region WHAT(5)..."
              Default: WHAT(4)

     WHAT(6): step length in assigning region numbers
               " steps of WHAT(6)"
              Default: 1.0

     SDUM   : not used

     Default (option CORRFACT not requested): no density scaling factors are


  • 1) Option CORRFACT is mainly used in connection with voxel geometries derived from a CT scan, where particle transport is done often in an equivalent material (e.g., water), but accounting for the density variations provided by scan at the voxel level. While this approach is reliable for what concerns ionisation, other reactions, which do not scale with density, must be simulated for the actual material composition.

Example, in a number-based input:

 * Multiply density by  a 0.85 factor for what concerns atomic processes
 * in regions 7, 8, 9, 10, 11, 12
 CORRFACT        0.85       0.0       0.0       7.0       12.

The same example, in a name-based input, supposing that the geometry is made of 12 regions:

 CORRFACT        0.85       0.0       0.0  The7thRg  @LASTREG
 * Note the use of the name @LASTREG to indicate the maximum number of regions
 * in the problem

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