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2015-02-28T23:51:46+05:30

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Radioactivity was discovered by becquerel which was serendipity in 1986.He observed a peuliar property of uranium salt affecting photographic plate even though when plate was packed  in a light proof  package.
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2015-03-01T09:17:11+05:30
Radioactivity is the spontaneous emission of alpha,beta or gamma rays.It is a nuclear phenomenon and is not affected by physical or chemical changes.
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