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radioactivity [radioactivities]▼(emission of ionizing radiation)noun[UK: ˌreɪ.dɪəʊæk.ˈtɪ.vɪ.ti] [US: ˌreɪ.dɪo.ʊæk.ˈtɪ.vɪ.ti]
radioactive▼(exhibiting radioactivity)adjective[UK: ˌreɪ.dɪəʊ.ˈæk.tɪv] [US: ˌreɪ.dɪo.ʊ.ˈæk.tɪv]
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