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Radioactive heat-producing element abundance in the crust of continental China estimated from terrestrial heat flow and the helium isotopic composition of underground fluids 应用大地热流和地下流体氦同位素组成资料计算中国大陆地壳生热元素丰度
helium isotopic composition 氦同位素组成
How could such a change in isotopic composition have come about? 同位素的组成有这样的变化，究竟是如何发生的？
The atmospheric helium isotope ratio: Is it changing? 大气氦同位素比率在变化吗?
According to the resul ts of carbon and helium isotopic analyses and gas component analysis,it is thoug ht that the natural gas produced in the region belongs to a typical biogenic met hane gas. 根据碳同位素与氦同位素以及气组成分析，表明该区所产天然气为典型的生物甲烷气。
It is important to avoid the use of uranium compounds of unspecified isotopic composition. 要避免使用那种非专用的同位素成份的铀化合物。
Another mystery is the isotopic composition of xenon found in minerals from the Oklo uranium deposit in Gabon, Africa. 另一个令人费解的问题就是在非洲加蓬的奥克洛铀矿床的矿物中所发现的氙同位素组成。
The whole-rock Pb isotopic composit ions of the North Dabie Complex(NDC),the South Dabie Complex(SDC)and the Cretaceous granites in the ea st Dabie Mountains are reported. 研究了大别山东部北大别变质杂岩、南大别变质杂岩和白垩纪花岗岩的全岩Pb同位素组成。
Stable isotopic composition of fossil ostracode is used as an ideal proxy for paleo-lake sedimentary environments. 摘要介形虫化石壳体被认为是反映古湖泊沉积环境的理想对象。
Title： Zircon age and Sr-Nd-Hf isotopic composition of migmatite in the eastern Tengchong block,western Yunnan. 关键词：滇西地区;基底;混合岩;锆石年龄;
The research also shows that there is not any change in the stable carbon isotopic composition in all these river systems caused by the quake. 本研究同时显示921地震并未对这些河川之稳定碳同位素组成造成影响。
A synthetic element produced in trace quantities by helium isotope bombardment of curium. 一种合成元素，由氦同位素轰击锔可得到微量的这种元素。
It quickly became clear, however, that the isotopic composition of meteorites differed not at all from that of the Earth itself. 然而事情很快清楚了，陨石中的同位素比例与地球自身没有什么不同。
The isotopic composition of hydrogen and oxygen in heavy water are analyzed by using a high-resolution mass spectrometer. 摘要用高分辨率质谱计分析了重水中氢与氧的同位素组成；
To analyze the isotopic composition of xenon requires a mass spectrometer, an instrument that can separate atoms according to their atomic weight. 要分析氙的同位素组成需要一台质谱仪，这是一种能将原子按照原子量分离的仪器。
Abstract The isotopic composition of hydrogen and oxygen in heavy water are analyzed by using a high-resolution mass spectrometer. 摘要用高分辨率质谱计分析了重水中氢与氧的同位素组成;
Carbon isotopic composition of modern soil and paleosol as a response to vegetation change on the Chinese Loess Plateau. 黄土高原现代土壤和古土壤有机碳同位素对植被的响应","Liu, WG;Ning, YF;An, ZS;Wu, ZH;
This article mainly studies the origin of ore-forming matter, by analyzing ores, strata and granites Pb isotopic composition. 本文通过对彩霞山铅锌矿床的矿石铅、岩浆岩石铅和围岩岩石铅的同位素组成分析，来探讨成矿物质的来源。
The results show that hydrogen and oxygen isotopic composition can be analyzed in the same time by using high-resolution mass spectrometer,little sample is used and the r... 结果表明,高分辨率质谱法分析重水,可同时分析其中的氢同位素和氧同位素,并且用样量小,结果可靠。
One possible method of measurement of isotopic composition and mass for plutonium is discussed and its feasibility in theory is demonstrated by the MCNP4B package in this paper. 摘要利用MCNP4B程序，通过一个实例探讨了钚的同位素成分及总质量测量的理论可行性。