Results Interpretation

Dear fluka experts,
I’m getting some results that I’m having a hard time interpreting. Can you help me?
My input consists of a beam of protons hitting a cell. My first deadlock is related to the USRBDX [1] detector, it doesn’t produce any results and the files appear empty.
And second, about a plot type of .dat file generated from a USRBIN card that I tried to plot on the USR-1D tab, but I can’t understand the graph and results and I’m wondering if they mean anything at all… . [2]
I would also like to know if I can use the PART-THRES [3] card for this type of input, what could be wrong?
And ALSO, sorry for all the questions, I would like to know if I could use the BIASING or LAM-BIAS cards to increase the rate in the cell that secondary particle production events occur, when I use USRBIN detectors to look for secondary particles, nothing is produced. What do you think could be wrong?
Attached files follow.
Thank you very much in advance!!

celula.flair (6.0 KB)
celula.inp (3.9 KB)
celula_01.inp (4.1 KB)
celula_01.out (869 Bytes)

Just to complement…
The graph of [2] :

Dear @victoria.rapos,

You are trying to simulate protons of 1 keV, which are at the very lower end of what FLUKA can handle as secondary particles, and well below the limit for primary particles. Therefore, I doubt you can get any meaningful result.

In case you ever go for higher energies, note that:

  • Default particle transport and production thresholds must be lowered accordingly.

  • One should aim for USRBIN bin sizes larger than particle ranges.

  • Indeed you could use LAM-BIAS.

Here a presentation that could be helpful regarding particle thresholds and USRBIN bin sizes.

Thanks to @cesc for the enriching offline discussion.

Kind regards,