According to High Guard, large ships' crews suffer a degradation in performance for every 10% of their hull points they lose to radiation weapons (if unshielded). This is quite tidy for handling large crews abstractly. The question here is: how would you handle radiation damage to an individual crewmember? Would you have him/her take 2Dx100-500 RADs every time the ship took 10% of its hull points in damage? Or would you assign a certain probability of him/her being radiated each time the ship took a radiation hit?