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Radioactive decay
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==Hazard warning signs== <gallery> file:Radioactive.svg|The trefoil symbol used to warn of presence of radioactive material or ionising radiation<!-- The [[Unicode]] encoding of this symbol is U+2622 ({{unicode|β’}}) --> File:Logo iso radiation.svg|2007 ISO radioactivity [[hazard symbol]] intended for IAEA Category 1, 2 and 3 sources defined as dangerous sources capable of death or serious injury<ref>[http://www.iaea.org/newscenter/news/2007/radiationsymbol.html IAEA news release Feb 2007]</ref> File:Dangclass7.svg|One of several dangerous goods transport classification signs for radioactive materials </gallery>
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