a radioactive isotope of an element; produced either naturally or artificially
例句
用作名词 (n.)
Thus, the chondrules should have made a much greater contribution to radioisotope heating than the refractory inclusions did. 因此球粒提供的放射性同位素加热，应该比耐火包体多。
Absorption of exogenous calcium and sucrose and their deposit onto the cell walls in litchi pericarp were studied by using radioisotope tracer technique. 摘要利用放射性同位素示踪技术研究荔枝果皮对外源钙和蔗糖的吸收及细胞壁构建规律。
美
[ˌreɪdioʊ'aɪsətoʊp]
