Dear all,

I am trying to realise a simulation of X-ray radiography of objects inside a barrel. I use the FIR card (Flux Image Radiography) with MCNP6.

I obtained a mctal file. I don't well understand the construction of this file.

Overall, I have 3 blocks.

- The first one seems to be the coordinates of S axis (FS card) of my grid.

- The second one seems to be the coordinates of T axis (C card) of my grid

- The last one is (I think) the flux with the statistical uncertainties.

I created à grid with 100 intervals in the S axis and in the T axis too:

FS5 -5 100i 105

C5 -55 100i 55

So, I believed to obtain 10404 values of flux (102x102), but it is not the case. There are 20402 values. Somebody can explain why?

Moreover, I would like to use this mctal file to visualise the X-ray radiography. I tried to use GRIDCONV but without success. I tried too, to use Vised (2D tally plot) and import mctal or runtpe file, but I had this message:

"number of points to plot is less than 2. no plot. "

Any idea?

Thank you for your help.

Déborah