How to overwrite 50%-50% assumption on isomer production

First of all, thank you for your answer. How to use experimental values to replace the 50-50 split in the FLUKA program?

Dear @chendesheng

You cannot actually replace the 50-50 sharing. You can however use the total 99Tc yield (ground+isomer) and apply the experimental isomeric ratio (IR(E)=\frac{\sigma_{isom}(E)}{\sigma_{ground}(E)}) to it to determine the isomer production. Since this ratio is a function of energy, be careful to do this for thin targets (i.e. thin enough that the proton energy loss in the layer is not substantial).

Understood, thank you again for your help. :100: