Difference between revisions 3859346 and 3859394 on simplewiki{{complex|date=September 2012}}
{{wikify|date=September 2012}}⏎
Radioactive substances emit energy in the form of radiations.There is a background of natural radiation everywhere in our environment. It comes from space i.e.,cosmic rays and from naturally occuring radioactive materials contained in the earth and in living things.In the natural environment,radiations are always being emmited from terrestrial sources and from the cosmic rays from space.But these emissions are of very low level.Since the beginning of life,every living being is exposed to the natural radiations.'''
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