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Art: Radiation Overview 1 
This article presents an overview of radiation. We will briefly discuss the difference between ionizing and non-ionizing radiation, and give examples of commonly encountered radiation.

Radiation means the flow of some kind of energy. We usually think of this energy as moving outwards. It is often the case that as the energy moves spreading wider and wider.

A simple example of this radiating outward and spreading wider and wider is the ripple pattern that you see when you cast a stone into a pond.

There are many types of radiation. the sound from a Hi-Fi speaker is referred-to as sound waves. These sound waves are acoustic radiation.

Light from a light bulb is a radiation of photons. There are many examples.

In the broad area of electromagnetic radiation, we usually classify radiation as ionizing or non-ionizing.

Ionizing radiation is very high energy, and damages atoms and molecules that are in its path. Ionizing radiation typically strips away electrons, leaving the atoms or molecules as positively charged ions, hence the name of ionizing radiation. X-rays and cosmic rays are examples of ionizing radiation.

Non-ionizing radiation includes radio transmitters of all types, such as AM-FM broadcast stations, cell phones, cell phone relay stations (cell phone towers), handie-talkies, wireless Internet networks, and many more.

Non-ionizing radiation can move outward, equally in all directions or can be focused, by an antenna, to move only in specific directions. The so-called Dish antennas that point at satellites are an example of focused atnennas.