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Electromagnetic spectrum displayed left to right by higher frequency, shorter wavelength to lower frequency, longer wave length. From left to right higher frequency examples are Cosmic radiation gamma radiation and X-rays (these are forms of ionising radiation); next moving toward lower frequency examples from left to right, ultraviolet radiation, visible light, infrared radiation, microwaves and radio waves (these are forms of non-ionising radiation). Pictorial examples of the types of electromagnetic spectrum are:

• Cosmic - radiation from Outer Space
• Gamma radiation - Nuclear Medicine treatment
• X-ray - medical X-ray
• Ultraviolet - radiation from the Sun
• Visible light - a Rainbow
• Infrared - radiant heater
• Micro Waves - a micro wave oven
• Radio waves - a radio broadcast