Radiation was a byproduct of many natural and artificial substances. Deadly items that were of this nature were deemed radioactive. Radiation encompassed the entire electromagnetic spectrum, including gamma rays, ultraviolet, infrared, and microwave radiation. It was categorized into five phases, with Phase 5 being the deadliest.

Doses of radiation could produce genetic mutations in creatures, resulting in mutants and other ghastly beings such as Coruscani ogres.
Radiation is energy that comes from a source and travels through some material or through space. Light, heat and sound are types of radiation. The kind of radiation discussed in this presentation is called ionizing radiation because it can produce charged particles (ions) in matter.

Ionizing radiation is produced by unstable atoms. Unstable atoms differ from stable atoms because they have an excess of energy or mass or both.

Unstable atoms are said to be radioactive. In order to reach stability, these atoms give off, or emit, the excess energy or mass. These emissions are called radiation. The kinds of radiation are electromagnetic (like light) and particulate (i.e., mass given off with the energy of motion). Gamma radiation and X-rays are examples of electromagnetic radiation. Beta and alpha radiation are examples of particulate radiation. Ionizing radiation can also be produced by devices such as X-ray machines.

Radiation exposure occurs by diagnostic X-ray. Irradiation by machine-generated radiation occurs only when the machine is turned on.
X-ray machine

There is also natural background radiation exposure. It comes from cosmic rays and from naturally occurring radioactive materials contained in the earth and in living things.

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