# Re: [fluka-discuss]: About USRBDX card

From: Amit Kumar <amit.live.sal_at_gmail.com>
Date: Fri, 29 Nov 2013 17:40:57 +0530

Dear Sujoy

I am calculating photons crossing a boundary where energy of photons vary
from 0 to 6 MeV. So, energy of photons is well above the photon transport
cutoff.
What I am understanding is that problem is in the number of photons going
below E-06 and USRBDX is assuming it as Zero.

On Fri, Nov 29, 2013 at 4:41 PM, Sujoy Chatterjee <sujoy_at_vecc.gov.in> wrote:

> Dear Amit,
> As the lower limit of Photon transportation in FLUKA is 1 keV, you are not
> getting any photons in the USRBDX card below this energy. If the photons
> becomes below this energy, the energy is deposited locally and are not
> further transported. I hope this helps.
>
> Sujoy Chatterjee
> Kolkata - 700064
> फ़ोन/Ph: +91-33-23184208
> फैक्स/Fax:+91-33-23346871
>
> -----owner-fluka-discuss_at_mi.infn.it wrote: -----To:
> fluka-discuss_at_fluka.org
> From: Amit Kumar
> Sent by: owner-fluka-discuss_at_mi.infn.it
> Date: 11/29/2013 04:36PM
> Subject: [fluka-discuss]: About USRBDX card
>
> Dear Fluka users
>
> I am using USRBDX card to get number (or fluence per primary) of photons
> crossing a boundary between two regions. But, I am not getting fluence
> below E-06 (i.e. 0.000001) as non-Zero, means all values below E-06 is
> considered to be Zero by USRBDX. Perhaps E-06 is the minimum limit that
> USRBDX can give as non-Zero.
>
>
> 1. Please clarify my doubt wether E-06 is the minimum limit that USRBDX
> can calculate as non-Zero.
> 2. If this is true, then, can we set the minimum limit as low as we want
> so that I can get photon fluence using USRBDX like E-11 or E-15.
>
>
> Any kind of assistance will be appreciable.
>
> --
> Amit KumarBhaha Atomic Research CentreMumbai, INDIA
>
> Phone No. : 022-25592841
> Mobile Number: 9969799819Alt. Email Id. amitkumar_at_barc.gov.in
>
>

```--
Amit Kumar
Bhaha Atomic Research Centre
Mumbai
Phone No. : 022-25592841
Mobile Number: 9969799819
Alt. Email Id. amitkumar_at_barc.gov.in
```
Received on Fri Nov 29 2013 - 14:02:17 CET

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