First of all, "radiation" is any energy that flows out from a source. There is radiation coming from your body if it is cool out: This type is called, "Heat".
There is another type of radiation coming from a candle: you can see it, and it is called, "Light".
X-ray machines radiate, well, 'X-rays'.
There is electrostatic radiation coming out of older TV sets: It's the same thing as when you touch something and get a little shock. It is not dangerous.
Atomic radiation, or nuclear radiation comes from radio-active sources like uranium and radium. This one is more dangerous than the others because it is usually very strong and can 'cook' you quickly, much like a microwave oven can cook flesh.
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