Neutron Radiation Damage

Am new to Geant4 and I want to use Geant4 to simulate fast neutrons radiation damage on a material placed in a fission nuclear reactor core. specifically I want to be able to calculate displacements per atoms (dpa) and the vancancies created from recoils if it possible. How do I achieve this. I would not mind if you link me up with you to help me achieve this. I am a research student. Thank you