放射性同位元素 ほうしゃせいどういげんそ Meanings Noun radioisotope; radioactive isotope See also: 放射性同位体 (ほうしゃせいどういたい). Kanji 放 release. Read as ホウ. 射 shoot. Read as シャ. 性 nature. Read as セイ. 同 same. Read as ドウ. 位 rank 元 source. Read as ゲン. 素 element. Read as ソ. Word lists Physics Jinuma: Japanese Dictionary · Word lists