[Gate-users] Phase Space Backscatter?

David Leibold D.Leibold at tudelft.nl
Sun Jul 17 13:19:30 CEST 2022

Dear Maikol,

you are talking about backscatter, but then you define it as “particles generated in the surround, which are daughters of particles that go out of the volume [to which the phase space is attached]”. I would say that when scatter occurs, the (back)scattered particle is still the same as the initial particle. Secondary production, on the other hand, refers to the generation of a new particle.

A phase space actor records every particle only once. I was told that the reasoning behind this is probably that a phase space actor is intended to be used as a source as well. If a source emitted the same particle twice, that would be unphysical.

I do not know how the phase space behaves concerning secondaries of particles that entered that phase space already, others my shed more light on this. You can find this out by simulating a pencil beam emitted by a source (e.g. z=0) hitting a volume to which a phase space actor is attached (e.g. z=1). Then you also add a second phase space actor behind the source (e.g. z= –1). If there is a secondary created, then you can check whether both phase space actors record that secondary.

Kind regards,

> On 17 Jul2022, at 13:01, Maikol Salas Ramirez <mmsalas at gmail.com> wrote:
> Dear Gate users,
> I am using a phase space in my simulation. In the simulation, the volume to which the phase space is attached is surrounded by a radioactive source. The phase space is recording particles entering the volume. My question is if the phase space also records the backscatter (particles generated in the surround, which are daughters of particles that go out of the volume). The problem is that I don't know if I have to add a backscatter medium when I use the phase space or if it is already considered in the phase space.
> Best regards
> Maikol
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