radium
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elementradioactivityisotoperadiationuraniumthoriumpoloniumactinidealkaline-earth-metalnucleusprotonneutronelectrondecayhalf-lifeionizationphosphorescenceluminescenceglowfluorescencechemistryphysicsvalenceoreextractionrefiningradiotherapyoncologycancertumorbrachytherapyirradiationdosagetoxicitypoisoningmutationleadradonstableunstablecriticalityfissionfusionreactorshieldingdosimeterscintillationBecquerelSievertGrayhazardcontaminationwastedisposalglow-in-the-darkpaintluminousradioisotopetransmutationenergyphotonspectrumnucleosynthesismetallurgymineralogy