isotopic indicator

英

美 [ˌaɪsəˈtɑpɪk ˈɪndɪkeɪtər]

n. 同位素指示剂

Isotopic composition, the percentages of the different isotopes of an element in a given sample of the element, is therefore particularly suitable as an indicator of the sources of the ore.
所谓同位素构成，是指在某一元素的特定样品中该元素不同同位素的百分比率。同位素构成因此特别适合于作为铜矿厂来源的示踪物。
The wide occurrences of fullerenes in the event strata suggest that fullerene can be one of the important geochemical indicators of strata events and fullerene with abnormal noble gas isotopic composition a direct indicator of extraterrestrial impact events.
事件地层中普遍存在富勒烯，表明天然富勒烯可以作为地层中发生过重大灾变事件的重要的地球化学指标，而具有异常稀有气体同位素组成的富勒烯则是地外撞击事件的最直接证据。
δ~ ( 18) O of lacustrine authigenic carbonates, i. e. δ~ ( 18) O_c is an important environmental isotopic indicator for the study of lake water isotopic balance and of climatic evolution.
湖泊自生碳酸盐δ18O（δ18Oc）是研究湖泊水体同位素平衡和气候变化的重要环境同位素指标。