同位素

如何运用放射性同位素？

How to apply a radio isotope ?

利用C、N同位素组成的变化指示水体中营养状况的变化。

Carbon and nitrogen stable isotope are used as indicators of nutrient changes .

今天许多放射性同位素是用被称为回旋加速器的粒子加速器来制造的。

Today many radioisotopes are produced using the particle accelerator called a cyclotron .

要避免使用那种非专用的同位素成分的铀化合物。

It is important to avoid the use of uranium compounds of unspecified isotopic composition .

这些爆炸产生了大量被称作“碳-14”的同位素。

These explosions produced huge amounts of an isotope3 called Carbon-14 .

氚是最和缓的放射性同位素之一

Tritium is one of the mildest radioactive isotopes .

碳的诸多同位素

the many isotopes of carbon

便携式同位素源X射线荧光仪在合金分类中的应用

Application of portable fluorescence of isotope sources in the alloy classification

硅酸盐和金属氧化物矿物氧同位素组成的CO2激光氟化分析

Oxygen Isotope Analysis of Silicate and Metal Oxide Minerals by CO_2 Laser Fluorination

CO2全球循环及其同位素示踪研究

Co_2 global cycle and its isotopic tracing investigation

同位素核素骨显像检查，实验组与对照组差异有显著性意义（P＜005）。

There is a statistical difference between experimental and control group ( P < 0 . 05 ) in skeletal scintigraphy .

同位素源X射线荧光法对高放废液中铀的分析

Analysis of u in the high-level liquid waste by isotopic source exciting X-ray fluorescence spectrometry

偏最小二乘（PLS）在同位素X射线荧光多组分同时分析中的应用

Application of partial least-squares method in multicomponent analysis by portable radioisotope XRFS

Sr和Nd同位素资料表明，在岩浆形成过程中地壳物质带入未起重要作用。

Sr and Nd isotopic data indicate that crust involvement was not significant .

扬子地块东南缘沉积岩的Nd同位素研究

Nd Isotope Ratios of Sedimentary Rocks from the Southeastern Margin of Yangtze Block , China

Os用同位素稀释法测定。

Using . coli DNA polymerase I , E. Os was determined by isotope dilution-ICPMS .

采用本组建立的以饮水为奖励的大鼠空间变换（Spatialalternation）学习记忆模式，研究了空间学习训练后，脑内NOS活性的变化，NOS活性测定采用同位素标记法。

The changes of NOS activity in rat brain after a water-rewarded spatial alternation task .

通用同位素标准化程序及在Sr、Nd同位素分析上的应用

A general normalization program for isotopes and its application in SR and Nd isotopic analysis

用~（14）C同位素示踪法和气相色谱法研究了粉锈宁农药施用后在小麦和土壤中的残留降解规律。

~ ( 14 ) C tracer analysis and gas chromatography were used to study the residual and degradation characteristic of triadimefon in wheat and soil .

~（40）Ar-~（39）Ar同位素测年方法及其应用

~ ( 40 ) Ar - ~ ( 39 ) Ar isotopic dating method and application

南岭中段主要锡矿床He、Ar同位素组成及其意义

He and Ar Isotopic Components of Main Tin Deposits from Central Nanling Region and Its Signification

通过C（27）/C（29）甾烷和有机碳同位素来判断早古生代和前寒武纪的烃源岩的生物来源

Biological origin of Early Palaeozoic and Precambrian hydrocarbon source rocks based on c_ ( 27 ) / c_ ( 29 ) sterane ratio and organic carbon isotope

激光频率调制吸收光谱测量钻井气样中甲烷~（13）C/~（12）C同位素比

Measurement of Methane ~ ( 13 ) C / ~ ( 12 ) C Isotope Ratio of Slurry Gas from Oil Wells by Laser Frequency-Modulation Absorption Spectroscopy

土壤和沉积物中重金属积累及其Pb、S同位素示踪

Accumulation of heavy metals in soils and sediments and determination of pollutant source by Pb and S isotopic tracers

其地球化学特征表现在烃类的组成、C6&C7的轻烃组成及同位素组成等方面有着明显的不同。主体为高成熟的腐泥型气，与海相原油密切共生；

The geochemical characteristics of natural gas exhibit a great variations with respect to composition of hydrocarbon , C_6 & C_7 light hydrocarbon , isotope and so on .

目的：在TNF的研究中寻找一种取代同位素标记的检测亲和力的方法。

Objective : To find a method in the study of the affinity of TNF to substitute the iso-tope labelling technique .

华南火山岩及铀成矿相关的Sr，Nd，Pb同位素演化规律研究

Research on evolutionary laws of sr , nd , Pb isotopes of uranium metallization and volcanic rocks in South China

S、H、O、Pb同位素组成表明成矿物质和成矿流体来自岩浆热液。

S , H , O and Pb isotopes show that the ore-forming fluid and ( metallogenic ) material come from magmatic hydrothermal fluids .

相对论连续谱Hartree-Bogoliubov理论对Dy偶同位素链的研究

Even Dy Isotopes in Relativistic Continuum Hartree - Bogoliubov Theory

Sr和Nd同位素证据说明老地壳物质在岩浆形成中起了重要作用。

Sr and Nd isotopic evidence suggests that ancient crustal material has played an important role in the magma genesis .