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boneseeker▼(element that has a tendency to accumulate in bones)noun
radioisotope [radioisotopes]▼(a radioactive isotope of an element)noun[UK: ˌreɪ.dɪəʊ.ˈaɪ.sə.təʊp] [US: ˌreɪ.dɪo.ʊ.ˈaɪ.sətoʊp]
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