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What is radiation?

What is radiation?
Radiation can be defined as
small (subatomic) particles with kinetic energy that are radiated or transmitted through space.
One form of radiation possesses properties of light, with most of the radiation around us having this quality.
E.g.: X rays and gamma rays, which are used in medicine
Other radiation possesses particle-like properties (so small, these particles cannot be seen with a microscope).
E.g.: alpha rays, beta rays (from radioactive materials), heavy particle radiation (used in treating cancer)
Whata is radiation?
X rays and gamma rays are short wavelength
electromagnetic waves (with properties equivalent to light).
All the various waves shown below are electromagnetic waves and related to light.
Electromagnetic waves (radiation) = flow of energy transmitted through space (Sohei Kondo)
When radiation's wavelength is shorter than the wavelength of ultraviolet light (with increased energy), it can pass through the human body (as is the case with X rays and gamma rays). Even clothing cannot deter such radiation.
Alpha, beta, and gamma rays are radiation emitted from atomic nuclei, but X rays result when high-speed electrons collide with metal.
Neutron radiation is made up of particle rays and represents one aspect of A-bomb radiation.

Radiation exists everywhere on Earth--in the air, the oceans, and even the ground.