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放射性同位元素 hōshasei-dōigenso
gen. radioisotope n; radioactive isotope Engineering and Science Technical Dictionary (James Friend)
放射性同位元素ラジオアイソトープ、 ラジオアイソトープ hōshasei-dōigenso
gen. RI River and Water Resources Glossary (Infrastructure Development Institute Japan)