Difference between revisions of "Radioactivity"
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Latest revision as of 17:34, 16 February 2006
라듐, 우라늄, 코발트60같이 불안정한 원자핵이 스스로 붕괴하여 방사선을 방출하는 성질을 말한다.
- This page was last edited on 16 February 2006, at 17:34.
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