|Message: Re: Ionization Energy||Not Logged In (login)|
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Some EM processes have infrared divergences (delta ray production, bremsstrahlung) so in an explicit simulation there needs to be a low energy cut-off below which these infinite many low energy secondary particles are not generated and their combined energy is 'attributed to be lost to the medium' - GetTotalEnergyDeposit(). Secondary particles above that threshold are generated and the energy they take up is 'carried away by them'. This energy, of course, has to come from somewhere; it is the energy remainder between the PreStepPoint and PostStepPoint kinetic energy of the primary GetDeltaEnergy() minus GetTotalEnergyDeposit(). The secondary particles' energies may or may not be dumped into the same medium/volume depending on whether or not those particles stop in the medium or escape. At tracking time of the secondaries the simulation will determine how much of their energy is deposited in the medium.
I am not sure this is the best possible explanation but hopefully sufficient.
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