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Forum: Processes Involving Optical Photons
Re: None Scintillation properties of BC 420 (Paola Marini)
Date: 16 Sep, 2010
From: Gumplinger Peter <Gumplinger Peter>

Hi Paola,

The bulk light attenuation length is a property of the material. This does not depend on which particle initiated the scintillation. Now, I don't see where/why you have another 'light attenuation length' and why this might differ from the former?

The spectrum of the relative light output vs wavelength (or energy) is referred to in G4 as the emission spectrum. Are you telling me that you have a spectrum of particle's energy vs light output for each type of particle (p,d,t,alpha)? Why do you say 'vs the relative light output'?

In G4 you can define and attach a different G4Scintillation process to different particles. See Example 5.6 in the Application Developers Manual. However, this does not allow you to change the emission spectrum shape and/or time constants since the latter are assumed to be a property of the material.

> I thought to use SetScintillationYieldFactor, but the responses are not simply

> proportional, their ratio depends on the particle energy.

In G4 the number of emitted photons is proportional (by the 'scintillation yield') to the energy lost by that particle to the medium. This is calculated step by step as the particle is simulated traversing your scintillator volume. It is NOT calculated from the particle's momentarily energy or what type of particle it is. It is however possible to adjust how this yield scales to the one specified for the material by specifying a different ScintillationYieldFactor in the scint-processes attached to the various particles.

> Is the "FASTCOMPONENT" the light output as a function of the energy of the

> emitted photon?

Yes (and there can be similarly a SLOWCOMPONENT in the case a scintillator has two types of emission spectra).

I am not sure I have answered all of your questions. Now, how the particle loses energy to the medium is of course particle type and particle energy dependent. But this is properly taken into account in G4 by the energy loss processes involved.

Peter

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