High-intensity bundle of energy being emitted from some decaying nuclei beta particle 2. particle radiating from the nucleus of some atoms alpha particle 3. negative particle identical to an electron but radiating from a decaying nucleus gamma ray

Alpha particles, beta particles, and gamma rays are the three most general kinds of radiation discharged by radioactive or unstable isotopes. Gamma rays refer to the high-intensity bundle of energy being emitted from certain decaying nuclei.  

Beta particles refer to the negative particle similar to an electron but radiating from a decaying nucleus.  

Alpha particles refer to the particles radiating from the nucleus of certain atoms similar to a nucleus of a helium.