<P> In physics, radiation is the emission or transmission of energy in the form of waves or particles through space or through a material medium . This includes: </P> <Ul> <Li> electromagnetic radiation, such as radio waves, microwaves, visible light, x-rays, and gamma radiation (γ) </Li> <Li> particle radiation, such as alpha radiation (α), beta radiation (β), and neutron radiation (particles of non-zero rest energy) </Li> <Li> acoustic radiation, such as ultrasound, sound, and seismic waves (dependent on a physical transmission medium) </Li> <Li> gravitational radiation, radiation that takes the form of gravitational waves, or ripples in the curvature of spacetime . </Li> </Ul> <Li> electromagnetic radiation, such as radio waves, microwaves, visible light, x-rays, and gamma radiation (γ) </Li> <Li> particle radiation, such as alpha radiation (α), beta radiation (β), and neutron radiation (particles of non-zero rest energy) </Li>

Alpha particles vs beta particles vs gamma rays