Distributed microsphere as source

Dear Experts, I have a spherical geometry of diameter 30 cm filled with water. Now I want to model multiple microspheres which are uniformly distributed within the 30 cm dia sphere.

In the second step, I want to declare all of these distributed microspheres as radiation sources.

Is it possible in FLUKA. How to do this.

Any suggestions will be helpful for me.

Thanking you in advance.

Dear @ArghyaC,

I would suggest you to write your own source routine, I think it would be the simplest way to implement your source.
Have a look at the slides from the dedicated lecture.

Thank you very much. I will try.