Hello
just one specification:
Production thresholds do NOT apply to nuclear interactions and nuclear
decays. X, Gamma rays, beta and auger electrons will be in any case
produced. They could be immediately "dumped" on spot if the TRANSPORT
threshold is higher than their energy.
As Vasilis said, transport thresholds do NOT apply in vacuum, otherwise
there could be energy deposition in vacuum, that is a nonsense.
Thus, setting a very high transport threshold for photons will cause:
- in air: all photons stopped at the production point, their energy
deposited there
- in vacuum: photons will fly up to the next region (air?) and stop
immediately after the boundary.
Also:
The production/transport threshold for photons has no direct effect on
electrons and vice-versa. There is an non-direct effect, of course: if
photons are killed, they will not produce secondary electrons.
Hope this helps
Paola
> Hi Thomas,
>
> I told you the inverse for the thresholds in vacuum.
> Since you cannot deposit energy in the vacuum
> the transport threshold doesn't apply, while
> of course the production can apply as I mentioned
> before after a decay.
>
> Cheers
> Vasilis
>
> ________________________________
> From: owner-fluka-discuss_at_mi.infn.it [owner-fluka-discuss_at_mi.infn.it] on
> behalf of Vasilis Vlachoudis [Vasilis.Vlachoudis_at_cern.ch]
> Sent: Monday, September 11, 2017 17:56
> To: Thomas Frosio; fluka-discuss_at_fluka.org
> Subject: [fluka-discuss]: RE: Score monoenergetic electrons and removing
> photons for source calculation
>
> Hi Thomas,
>
> if you put a high threshold for both production and transport in EMFCUT
> (for the decay part)
> nothing will be generated nor transported.
> You can try to put a low threshold for production and a high for transport
> so the electrons will be generated and killed immediately.
>
> Vacuum is special, no interaction can happen there (apart decays) so the
> production threshold do not apply, while the transport threshold should be
> applied,
> which seems is not the case.
> Maybe is it not checked after a source particle is generated. I will try
> to check.
>
> Cheers
> Vasilis
>
> ________________________________
> From: owner-fluka-discuss_at_mi.infn.it [owner-fluka-discuss_at_mi.infn.it] on
> behalf of Thomas Frosio [thomas.frosio_at_cern.ch]
> Sent: Wednesday, September 06, 2017 16:04
> To: fluka-discuss_at_fluka.org
> Subject: [fluka-discuss]: Score monoenergetic electrons and removing
> photons for source calculation
>
> Dear FLUKA expert,
>
> I am with the volonty to compute E+/E- fluences related to a source in my
> geometry.
> In radioactive sources:
> 1 - Electrons/positrons can be produced directly by the source,
> continuously with the spectrum or discretly by internal conversion or
> Auger,
> 2 - Photons are emitted and interact with the environment outside the
> source, giving movement to electrons.
> I would like to remove electrons produced by process 2 and I want to keep
> Auger electrons and internal conversion electrons.
>
> My question concerns how are Auger and Internal Conversion simulated in
> the code:
> If I add an EMFCUT card, putting for example a threshold of 10TeV for
> photons in all my geometry, will Auger and IC electrons be simulated?
> In other terms, simulation of monoenergetic electrons in Fluka is linked
> with photon simulation or is there a description of probabililty to emit
> monoenergetic electrons directly in the source data?
>
>
> I have a second question.
> I made a simple input with a source of Tb156 cutting photons everywhere in
> the geometry until 10TeV.
> This source is inside vacuum. And this vacuum is in air.
> I used USRBDX score to check there is no photon passing from vacuum to
> air.
> Unfortunately, I observe a photon fluence.
> But if I replace vacuum by air, there is no fluence.
> Is there a reason for this ?
> The input is attached with the photon fluence.
>
>
> I thank you for your answer,
> Best regards,
> Thomas Frosio
>
>
Paola Sala
INFN Milano
tel. Milano +39-0250317374
tel. CERN +41-227679148
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Received on Tue Sep 12 2017 - 12:35:14 CEST