In radiotherapy, the goal is to kill as many cancer cells in a localised area without killing normal cells right? So what possible reason would there be to use gamma irradiation over alpha irradiation?
Gamma is not as good at ionising and damaging cells and atoms that make them up as alpha is. it is also very good transmitting through hard AND soft surfaces so gamma irradiation results in much more collateral damage than alpha irradiation. Alpha particles are absorbed easily and cause more damage to cells.
So why are gamma waves used instead of alpha particles in radiotherapy?