How to define a beam source of an energy spectrum

Dear experts:
I am doing some research on the design of radiation shielding materials for satellites. I simplified the satellite into a sphere and set its material and thickness. And I have tried several different beams with different energies. But now I want to define the specific energy spectrum of a certain space orbit (for example, AE8 spectrum) instead of a single energy beam for research, and I don’t know how to achieve it.
Is there any card or any advice to solve it?
Thanks.
Parry

Dear Parry,

In order to input your own energy spectrum, you can use the source_newgen.f user-written routine, which allows you to choose from several different sampling functions or to read from files.

You can find a lot of information on how to use the source routine here and here.

Regards,
Mihaela

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Dear Mihaela,

Thank you for your advice. It looks helpful to me and I would read this section in detail.

Regards,
Parry