Hi Bertrand,
You can selectively kill particles (your protons) by using usrmed.f routine, but as a beginner user you must get acquainted first with compilations, routines, variables, etc.
As for having different materials during irradiation and decay, currently you can only switch a material to VACUUM or BLACKHOLE for the decay part (but not the other way round) so that would not help you. In fact the current FLUKA development version does allow such things, which means that if you can wait some time (don’t ask how long) you could easily perform this calculation.
Also note, that, as far as I know, scoring residual gammas and then using those as a source for a second step calculation is not going to work since you can’t ‘intercept’ those gammas with regular user routines (such as mgdraw.f). Another solution is to use some routines developed by users, which scored isotope data files and used those to sample the residual gammas in your new geometry.
-Mario
On 2/23/17, 12:24 PM, "owner-fluka-discuss_at_mi.infn.it on behalf of George Kharashvili" <owner-fluka-discuss_at_mi.infn.it on behalf of georgek_at_jlab.org> wrote:
Dear Bertrand,
The short answer is no, or not easily. Proton transport threshold (set by default or by PART-THR card) applies to all regions and materials, while the electron, positron and photon production and transport thresholds (EMFCUT) are assigned by material and region respectively.
FLUKA does allow replacing any region with vacuum or blackhole for calculating decay radiation transport, but unfortunately not the other way around (you can not assign a new material other than those two for decay radiation transport only).
There must be more sophisticated ways of solving your problem, like scoring residual radioactivity in the target and then starting a new model with this activated target as the source of radiation in a separate model. But I don't think there is a simple solution that can be implemented in a one step calculation.
Best regards,
George
----- Original Message -----
From: "Bertrand Dewit" <bertrand.dewit_at_student.kuleuven.be>
To: "FLUKA Discussion List" <fluka-discuss_at_fluka.org>
Sent: Thursday, February 23, 2017 11:44:33 AM
Subject: [fluka-discuss]: stopping protons
Dear FLUKA experts,
I am a FLUKA beginner and I am currently trying to simulate the radiation caused by a proton irradiated target. The problem is that this irradiated target is transported afterwards transported to another area. It is in this area that I want to look at the radiation. My thought was to have the target already inside of the area to which it will be transported and have it irradiated there. But in that case I need to make sure that other parts of the room don't get exposed to the protons. Would it be possible to have a sphere around the beam and target that the protons of the beam can not cross, but the radiation of the activated target can?
Thanks in advance!
With kind regards,
?Bertrand
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Received on Fri Feb 24 2017 - 00:31:57 CET