Re: [fluka-discuss]: EMFIX_STEPSIZE_for_electron_dose_thinslab

From: Maria Ilaria Besana <>
Date: Fri, 20 Sep 2019 18:20:56 +0000

Dear Sougata,

there is not a general receipt to set the EMFIX and STEPSIZE values. It depends on your specific problem.
I have however some general suggestions.
I would recommend to use as low thresholds as possible for electrons and photons.
In addition to this you can consider to activate single scattering, using the MULSOPT card.
Replacing multiple scattering with single scattering can be very demanding in terms of CPU, but it can work for your case, since you are interested in a very thin layer and low energy particles.
Please have a look at the MULSOPT card in the manual, especially at Note 6.

Hope that helps,
best regards,

> On 18 Sep 2019, at 07:39, Sougata <> wrote:
> Dear Fluka users,
> I am trying to evaluate dose from electron beam in tissue. Energy of electron is 100 keV to 2 MeV for different cases. For this I am taking thin slab of thickness 0.004 cm (TISSUEIC material) which is surrounding by similar material. I have set transport/production cutoff at lowest available. I am scoring energy deposition. Fluka default is set at PRECESSION. My queries are as following
> 1. Is there any requirement to apply EFMIX and/or STEPSIZE for this case as I am scoring energy deposition in thin slab? If yes how to optimize. Because I observed variation of ~20% by applying maximum STEPSIZE of 0.0001 cm for the present input (FILE ATTACHED). Please elaborate.
> 2. What other precaution should I take for dosimetry at low energy electron for example around 100 keV ?
> --
> SOUGATA RAKSHIT / सौगत रक्षित
> Scientific Officer(D) / वैज्ञानिक आधिकारीक(D)
> RSSD / आर एस एस डि
> Bhabha Atomic Research Centre / भाभा परमानु अनुसंधान केंद्र
> Mumbai-400 085 / मुंबई-400 085
> Tel: +91-022-2559 2214/ दूरभाष: +91-022-2559 2214<betaVOL-500keV-TSUEIC-p004cm_aa.inp>

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Received on Fri Sep 20 2019 - 21:26:25 CEST

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