Re: Help to figure out errors in my input file

From: Stefan Roesler <>
Date: Fri, 8 Jun 2012 17:45:43 +0200

Dear Vahan

The material range in PHOTONUC should be from WHAT(4)=VACUUM to
WHAT(5)=LEAD, i.e. from lower to upper index (VACUUM has index 2 and LEAD
has index 17, see manual chapter 5.2), not vice versa.

Furthermore, I suggest that you shorten the inelastic interaction length
for photons (i.e. for photoproduction) in order to get neutrons within a
reasonable CPU. This is typically done with the following card

LAM-BIAS 0.0 0.02 0.0 PHOTON


On Fri, 8 Jun 2012, Vahan Petrosyan wrote:

> Hi I am new in fluka and want to calculate (as a test) beam dump on lead target that surrounded by
> concrete.I made geometry using SimpleGeo and debugged it successfully.
> Problem is I can't get the result of usrtrack card for NEUTRONS and it always gives ZEROES .
> I am asking anybody with experience to check my input file and help me to obtain neutrons fluence
> ( it is small one).
> below I attached my fluka input file and SimpleGeo DAT file.
> Thanks!
Received on Fri Jun 08 2012 - 23:37:10 CEST

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