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Volumetric Source#

The Volumetric source emit particles from randomly sampled starting positions from within the radioactive volume of a given component.

This source type has been designed for Brachytherapy applications (though there may be other applications as well).

Specify source type as:

s:So/MySource/Type = "Volumetric"

And then add an additional required parameter:

s:So/MySource/ActiveMaterial

to specify which material within the given component should be considered radioactive.

So, for example, if you have:

s:So/MySource/Type            = "Volumetric"
s:So/MySource/Component       = "ActiveSource"
sc:So/MySource/ActiveMaterial = "G4_Ir"

particles will start from randomly sampled positions within the Iridium parts of the component named ActiveSource.

Examples that use this source can be found in:

The energies and species of the emitted particles can be specified using

s:So/MySource/VolumetricParticle = "gamma"
d:So/MySource/VolumetricEnergy = 1 MeV
u:So/MySource/VolumetricEnergySpread = 0

or if using a spectrum:

s:So/MySource/VolumetricEnergySpectrumType = "Discreate" # Either "None", "Discreate" or "Continous"
dv:So/MySource/VolumetricEnergySpectrumValues = 3 50. 100. 150 MeV
uv:So/MySource/VolumetricEnergySpectrumWeights = 3 0.2 0.6 0.2

Warning

For this source type BeamParticle, BeamEnergy, BeamEnergySpread, BeamEnergySpectrumType, Values and Weights are deprecated. Now, use the source type as prefix for these parameters.