自然界有350种天然同位素，其中70种有放射性。
Seventy of the 350 naturally occurring isotopes are radioactive.
科学家首次发现富含天然同位素的食品可以构建更抗衰老的机体成分。
Scientists have shown for the first time that food enriched with natural isotopes builds bodily components that are more resistant to the processes of ageing.
同位素是存在于元素的变体，天然存在，同位素与元素具有相同的化学性质，但由于所含的中子数不同而重量不同。
These are naturally occurring variants of elements,which share the same chemical properties but have different weights because their nuclei contain different numbers of neutrons.
放射性沉降物中含有非天然的重元素和同位素。
The fallout contained heavy elements and isotopes not found in nature.
同位素比率直接用于比较各种石油或天然气。
The isotope ratio is directly used for comparing oils or gases.
目的：利用天然稳定同位素技术，探讨抗性淀粉吸收代谢的特点及对血糖调节的影响。
Objective: The metabolic characteristics of resistant starch and its regulative effect on glucose response were studied by native stable isotope technique.
对天然锇同位素进行了离心分离。
Osmium isotopes in the natural isotopic mixture are separation by gas centrifuge technology.
氚作为一种天然的环境同位素可广泛应用于水文地质领域，由于实测资料的稀缺，极大地限制了氚的应用。
Tritium, as a natural environmental isotope, can be broadly applied in hydrogeology. The application of tritium is greatly limited by the scarcity observations.
铀（U）元素就是一个很好的例子。天然铀有两种同位素；较轻的负235可以裂变，较重的铀238则不会裂变。
The prime example is the element uranium (U), which occurs naturally as two isotopes-the lighter, fissionable U-235 and the heavier, non-fissionable U-238.
一种碳的天然放射性同位素，原子量为4，半衰期为5，780年，用于测定古代生物标本，地质标本或考古遗迹的标本的年代。
A naturally radioactive carbon isotope with atomic mass 4 and half-life 5,780 years, used in determining the age of ancient organic, geologic, or archaeological specimens.
因为它是稀有天然放射性同位素钾衰变而产生的，所以可以用来测定十万年以上的岩石年龄和采样。
Because a radioactive form of argon is produced by decay of a naturally occurring radioactive potassium isotope, it can be used to date rocks and samples more than 100,000 years old.
程序在有天然放射性同位素和裂变产物存在下也是可用的。
In the presence of naturally radioactive isotopes and fission product...
由天然气碳同位素特征，可以得出西部斜坡区存在着大量的油型气，它们主要分布在泰康隆起带上。
According to isotope characteristics of gas, this paper considered there is a lot of oil-type gas in Western Slope, they distribute on Taikang uplift zone.
温度和环境同位素示踪方法同属于天然示踪方法，且前者是后者的重要影响因素。
Both temperature analysis and environmental isotope tracer method are natural tracer method. Temperature is important influence factor to the distribution of environmental isotope.
同位素是存在于元素的变体，天然存在，同位素与元素具有相同的化学性质，但由于所含的中子数不同而重量不同。
These are naturally occurring variants of elements, which share the same chemical properties but have different weights because their nuclei contain different Numbers of neutrons.
文中还通过储层中的天然气与气源岩生成天然气之碳同位素特征的分析对比，对各类天然气的展布特征进行了探讨。
The malleabilities of various types of gas are discussed in this paper according to the carbon isotope characteristics of the gas in reservoir and gas from gas source rock.
基于该气田天然气的组成和碳同位素特征认为，该气田的天然气也不可能是生物气与下部热成因天然气混合的产物。
Based on the characteristics of carbon isotope and components of gas in this field, it is believed that the gas is unlikely a mixture of biogas and the lower thermogenesis natural gas.
天然气的组分和碳、氢同位素组成特征研究表明塔里木盆地已发现的天然气均为热解气。
Research on chemical components and isotope composition of carbon and hydrogen of natural gases from the Tarim basin shows that all discovered gases in this basin are thermogenic.
从CO2分布特征入手，利用其天然气碳同位素图版分析了松辽盆地南部CO2成因类型；
This paper analyzes the genesis of the CO2 of the southern part of Songliao Basin using carbon isotope chart of natural gas starting with the distribution characteristic of CO2.
本文利用轻烃(C_1—C_7)和碳同位素分析资抖，对滨海地区浅层天然气成因进行探讨。
This paper gives a discussion on the origin of natural gas in the shallow reservoir in Binhai area, by a study of light hydrocarbons (C_1-C_7) and carbon isotopes.
通过对我国陆相成因天然气碳、氢同位素研究，探讨其同位素组成特征及其意义，从而为各种成因类型天然气的勘探开发提供了有益的信息。
Studies of the C and H isotopic composition of natural gases of continental origin will provide valuable information on the prospecting and development of natural gases of different genetic types.
本文根据组分及甲烷同系物的碳氢同位素确定柴达木盆地东部第四系天然气为生物气类型；
The Quaternary natural gas in the east of Qaidam basin is determined to be biogenic gas through a studying of gas composition, carbon and hydrogen isotopes in methane.
根据天然气成分分析和CH4碳同位素资料，论证了该区天然气为浅层天然气。
According to analysis of natural gas ingredient and CH4 carbon isotope, it is proven that the natural gas of this area is superficial.
利用甲烷碳同位素资料将盆地中东部奥陶系天然气划分出四个运移场。
The natural gas in the Ordovician of the central-eastern part of the basin is divided into four migration fields by using the data of carbon isotopic ratio in methane.
在烃类天然气中，由于稀有气体的含量很微，所以其同位素组成的检测相对较困难。
The measurement of the noble gas isotopes in hydrocarbon natural gases is relatively difficult because their content is very low.
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。
According to the results of carbon and helium isotopic analyses and gas component analysis, it is thought that the natural gas produced in the region belongs to a typical biogenic methane gas.
无机成因天然气与生物成因天然气在地球化学特征上存在显著的差异，主要表现在化学成分和同位素组成特征。
There are some distinct geochemical differences between the organic and inorganic gases, mainly in chemical composition and the composition of isotopes.
图4塔里木盆地天然气乙烷碳同位素分布图fig。
The carbon isotope value distribution of ethane in the Tarim Basin.
天然气乙烷碳同位素与各层系烃源岩干酪根碳同位素值对比结果揭示普光气田天然气主要来自二叠系烃源层。
The carbon isotope correlation between ethane in the natural gases and source rock kerogens shows that the gases in the reservoirs were mainly derived from Permian strata.
本文依据各气田天然气的组分特征，将天然气划分为干气、湿气、凝析气和溶解气；依据同位素组成，将天然气归因为煤成气、油成气和二者的混合气。
According to the characteristics of natural gas composition in each gas field, the natural gas is classified as dry gas, wet gas, condensate gas and dissolved gas in this paper.
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