Direct action of radiation is the dominant process for: (A) X-rays, (B) Neutrons and alpha paicles, (C) Electrons, (D) Gamma rays
Answer is B. Ionizing radiation acts by two methods: Direct and IndirectDirect action is radiation directly causing DNA damage; example: neutrons and alpha paiclesIndirect action is radiation causing free radical production which acts on DNA; example: photons and gamma raysReference: Khan Physics of Radiation therapy; 5th edition