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keemilise elemendi isotoop, mis ei lagune tütarelementideks, ei oma poolestusaega ega ole radioaktiivne
stabiilne isotoop . Geoloogia terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//get/stabiilne%20isotoop/1/est (06.07.2026)
