Dear Davide Bozzato The target materials is PbBi and the Pb contain four isotopes of lead (204,206,207 and 208). I have defined the materials card with all the four isotopes, I am not sure if i define it correctly and also compound materials. Kindly help me to have a look. Thanks in advance. exam…

Be careful, there are some fundamental misconceptions in the exchange above. Both in @profftee97 ’s input and in @blefebvre MATERIAL cards, no single lead isotope is defined at all, rather for all of them the natural composition is taken by FLUKA! This is because the isotope selection is made by WHA…

Dear Saheed, You are correctly using the MATERIAL card to define the isotopes. Note however that you must respect the spacing of 10 characters between the WHATs of a card in the input file. In addition, floating point numbers must end on the 10th character column of the WHAT. A valid way to define …

Thanks. I hope I can start my WHAT 4 number from 26 27 28. 29 instead of 10 11 12 13 since FLUKA built materials number stop at 25 and retain bismuth number as the one in the FLUKA built in materials.

@Francesco What do you suggest I should do. The target is compound materials Lead-Bismuth. The lead consists of four isotopes.

There is no bismuth among the 25 FLUKA pre-defined materials. And there are no single lead isotopes. So, once you define them, they will take automatically a number from 26 onward. Conversely, if you redefine a pre-defined material (using the same name as in the manual ), this will keep the original …

I suggest to do something that makes sense as a function of your goals. I understand that you are interested in neutron production on your lead-bismuth target. Then, neutron transport in the latter may not be a main issue, as I commented above at the end of my first post. Define (properly, see abo…

@Francesco Thank you for your explanation. It will help alot.

@ceruttif Based on your suggestion, I defined the materials card for each isotope with low materials card. I also add Usryield/emerging card. Kindly help me to have a look. I am still a beginner struggle to understand all the fluka concept. Final.flair (2.6 KB) Final.inp (3.1 KB)

Please remove the WHAT(4) (#) and WHAT(5) (dE/dx) content from your MATERIAL cards. You forgot to assign the PbBi name to the COMPOUND card defining it. You forgot to select the component names in the COMPOUND card defining LEAD. Remove the USERDUMP card from your input, not to get a huge useless…

@ceruttif Done, kindly help me to have a final look. Thank you Final.flair (2.6 KB) Final.inp (3.1 KB)

Leave WHAT(5) (dE/dx) blank in the PbBi MATERIAL card. I’d have selected in all LOW-MAT the cross sections of natural lead, rather than 208Pb, but it may be not so critical to your purposes, as discussed above. Nevertheless, the LOW-MAT cards are wrong, because each of them should refer to one of y…

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Defining PbBi compound

Geometry and Materials

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