<prompt> Radioactive energy is released from?ProtonElectronNeutronsAll  <response>: All REF: Vasudevan sree kumari 3e p. 402, CSDT 10th e p. 1256 Rays used in radiotherapyRadiodiagnosis are of two broad types as per linear energy transfer LET Low LET High LET x-rays a paicles y-rays Neutrons 3-rays Protons electrons Heavy ions 