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keemilise elemendi isotoop, mis laguneb iseeneslikult; on radioaktiivne
mittestabiilne isotoop . Koolisõnastikud 2005–2010. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//kool_KV/mittestabiilne%20isotoop/1/est (07.08.2026)
