Units

• The default metric in FreeARt is the centimeter.

• Absorption is always record as \(g.cm^{-2}\).

  Internally to compute the absorption in the voxel we will compute the absorption from stepLength*voxelAbsorption with

  • stepLength = distance cross the voxel
  • voxelAbsorption = absorption on this voxel (\(g.cm^{-2}\))

in python

from freeart.unitsystem import metricsystem
...
detectorDistance = 1000 *metricsystem.cm
detectorRadius  = 10.0 *metricsystem.mm
...

in cpp

#include <units.h>
...
FreeART::ExperimentSetUp esu(1, FreeART::DetectorSetUp(FreeART::Position_FC(1000.0*UNITS::cm, 0.0,0.0), 10*UNITS::mm));
...