isotope

noun

1. 同位素
   one of two or more forms of a chemical element which have the same number of protons but a different number of neutrons in their atoms. They have different physical properties (= characteristics) but the same chemical ones
   1. radioactive isotopes
      放射性同位素
   2. the many isotopes of carbon
      碳的诸多同位素

1. N-COUNT 同位素
   Isotopes are atoms that have the same number of protons and electrons but different numbers of neutrons and therefore have different physical properties.
   1. ...tritium, a radioactive isotope of hydrogen.
      氢的放射性同位素氚

1. The experiment involved irregular ion movement theory and isotope theory.
   这项实验涉及了不规则离子运动理论和同位素理论。
2. Stable Isotope Analysis of Elements in Kerogen
   干酪根中各种元素的稳定同位素分析
3. One way to tell if life is the source of the gas is by measuring isotope ratios.
   其中一个方法判断生活的来源是通过测量气体同位素比率。
4. Research and isotope reactor
   研究和制备同位素的反应堆
5. Isotope production reactor of general atomic
   通用原子公司培训研究和同位素生产堆
6. An isotope of hydrogen which has one neutron ( as opposed to zero neutrons in hydrogen).
   同位素代换的磷酸盐含一个中子的氢的同位素（氢含零个中子）。
7. The meteoric origin of geothermal water in study area is evidenced by its environmental isotope composition.
   环境同位素研究结果表明，研究区地热水为大气降水成因。
8. An obvious restraint in the use of isotope ratios results from the need to employ mass spectrometers.
   使用同位素比值法有着一个明显的局限因素，就是要用质谱仪进行分析。
9. A radioactive isotope of carbon.
   碳的一种放射性同位素。
10. Oxygen isotope studies of the Suzhou granite have been made based on drill-hole samples.
    本文根据钻孔样品对苏州花岗岩主侵入阶段岩石作了较详细的氧同位素研究。
11. Any radioactive isotope introduced into the body to study metabolism or other biological processes.
    为了研究新陈代谢或其他生物学过程而引入身体的放射性同位素。
12. Finally, relation between differential loss and gas pressure, neon isotope ratio was studied.
    最后计算了各种差损系数与气压和氖同位素比例的关系。
13. This approach underpins much of my research on energy and nutrient flux, and has involved both natural abundance and enriched isotope tracing techniques.
    该方法巩固了对于我在能量和营养流的研究，并结合了自然丰度和浓缩同位素跟踪技法。
14. This paper analysed the carbon and oxygen isotope composition of brachiopods fossils from the Devonian Period in Sichuan Province.
    本论文对来自四川龙门山泥盆纪的腕足化石进行碳、氧同位素分析。
15. As expected, the researchers found the xenon isotope produced by uranium fission in uranium minerals from this deposit.
    正如所预料的那样，研究人员发现氙同位素是由这些沉积矿床中的铀矿物裂变产生的。
16. This paper introduces a simple method for production of plant labeling with14C isotope in a closed chamber supplying14C-CO2.
    本文详细介绍了一种在密闭箱中采用14C同位素标记植物的装置和操作方法。
17. Protein isotope labeling is crucial for NMR studies of the three-dimensional structure and dynamics of proteins in solution.
    在运用核磁共振技术研究蛋白质溶液三维结构和动态特性中，蛋白质的同位素标记表达是研究的关键。
18. Each element has at least one isotope with unstable nuclei that can undergo radioactive decay.
    每个元素至少有一个同位素不稳定原子核可以进行放射性衰变。
19. Methods of Carbon Isotope Analysis for Atmospheric Carbonyl Compounds and the Study of the Organic Pollution;
    大气羰基化合物碳同位素及大气有机污染物研究碳氢化合物是有机化合物。
20. Helium isotope compositions of the mantle-derived xenoliths and megacrysts from the Cenozoic basalts in Hannuoba were measured.
    对该地区新生代玄武岩中幔源包体和高压巨晶的氦同位素进行了初步研究。
21. A radioactive, inert, gaseous isotope of radon, with a half-life of3.92 seconds.
    氡的一种放射性的，惰性的和气态的同位素，其半衰期为3。92秒。
22. Stable isotope ratio analysis is an effective method for the identification of fruit juice adulteration.
    稳定同位素分析法就是根据这种差异对掺假果汁进行准确鉴别的有效方法。
23. ( physics, chemistry) being or containing an isotope with greater than average atomic mass or weight.
    （物理学，化学）指原子质量或者原子量大于平均水平的同位素，或者含有这样的同位素。
24. Changes of nuclear mass and nuclear size cause isotope shifts.
    原子核质量和大小的不同引起同位素移动。
25. Carbon isotopes show a pattern, but it is somewhat more difficult to interpret than the oxygen isotope pattern.
    碳同位素显示的格局，但它是较为困难的解释比氧同位素模式。
26. These neutrons react with nitrogen nuclei, giving out a proton and producing the active carbon isotope 14.
    这些中子跟氮元素的核子产生反应，释放出一个质子并产生出活性碳同位素14。
27. The Application of Sulfur Isotope in the Cause of Geochemical Abnormality
    硫同位素在地球化学异常成因研究中的应用
28. A radioactive isotope that is used in a compound in order to trace the mechanism of a chemical reaction.
    使化合物中化学反应的机制显踪的放射性同位素。
29. Pb isotope analysis suggested that Pb mainly came from depth, related with volcanic activity in sea floor.
    铅同位素分析表明矿床铅来源主要为深源，与海底火山活动存在一定关系。
30. Application of stable carbon isotope technique in study of methane emission from rice field
    稳定性碳同位素方法在稻田甲烷研究中的应用

noun

1. one of two or more atoms with the same atomic number but with different numbers of neutrons