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CORRFACT


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

    See also ASSIGNMAt, COMPOUND, LOW-MAT, MATERIAL, MAT-PROP

     
WHAT(1)
>= 0.0 : density scaling factor for charged particle ionisation processes (dE/dx, delta ray production, Möller and Bhabha scattering) = 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 "...to region
WHAT(5)
..."
Default
:
WHAT(4)
WHAT(6)
: step length in assigning region numbers "...in steps of
WHAT(6)
"
Default
: 1.0
SDUM
: not used
Default
(option CORRFACT not requested): no density scaling factors are applied
Note:
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:
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7...
* 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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