How to use source.f to set up I-131?

Dear experts,
Learned about Co-60 setup issues,How to set i-131 in source.f?
(I131 365keV 81.5%;636keV 7.16%;284keV 6.12%;80keV 2.62%;723keV 1.77%)
I hope the experts can modify this example and let me learn this knowledge?
Co-60.flair (1.7 KB)
source.f (9.1 KB)
Thank you in advance,

Dear @fengfengxu,
You don’t need a source routine to model an isotope source, but you can (and should) use Fluka built-in functionalities.
Have a look at a similar question (albeit for different isotopes): How to define a isotope radioactive γ source?

Dear Expert,
Thank you for your recommendation,The issue has been resolved.Since I was not clear about the rules, I thought I had sent the wrong question platform, I will pay attention in the future. Thank you for your reminding!
In addition, I would like to ask whether source.f can be used to achieve the above operations. Can I just go ahead and add “if…elself…elseif…endif”?

Thank you in advance,

Dear Fengfeng,

yes you can use as many ELSE IF statements as you need. But you need to be careful with the probability of each branch. See:


Dear Expert,
Thank you very much for your explanation and the reply from the experts!I will combine lectures and teachers’ suggestions to write.