Radiation refers to the emission [sending out] of energy as electromagnetic waves [a form of energy that can travel through space and matter] or as moving subatomic particles [tiny particles that make up atoms], especially high-energy particles that can cause damage to living organisms or materials.
- The sun emits radiation in the form of light and heat.
- X-rays are a type of radiation that can pass through the body to create images of bones.
Very Simple Definition:
Radiation is a kind of energy that comes from different sources and can be harmful to living things. It can come in the form of light or heat, or even tiny particles.
- When you stand under the sun and feel its warmth, that is a kind of radiation.
- X-rays that doctors use to see inside your body are another type of radiation.