天然放射性元素

自然伽玛测井（GammaRayLogging）利用伽玛辐射场，通过测量地层中天然放射性元素的自发衰变产生的伽玛射线来实现测井目的测井技术。

Gamma ray logging , which is based on gamma ray radiation field uses natural radioactivity of natural radioelement in stratum to accomplish the aim of logging .

中国黄土地区土壤中天然放射性元素的生物地球化学

Biogeochemistry of natural radioactive elements in soils of loess region in

利用月表天然放射性元素含量反演模型获取U、Th、K元素含量，绘制出这三种元素的全月含量分布图，并对元素含量反演结果的不确定性进行了初步分析。

Using the inversion model of absolute concentrations of natural radionuclides in lunar surface , the preliminary global distribution maps of Th , K and U are derived . The uncertainty of the inversion results is also analyzed .

印度洋海底钻孔样品中天然放射性元素的活化测定及其提供的古温度信息

Activation determination of natural radioactive elements in drill bore sediments of the Indian Ocean

在月球背面，天然放射性元素含量普遍表现为低值特征。

On the farside , these three elements generally show the features of low abundances .

矿碴、煤灰砖及其它建筑材料中天然放射性元素含量的中子活化分析及辐射安全分析

Determination of natural radioactive elements in slag , brick made from coal ash and other building material by INAA and their radiation save analysis

对西安市生活饮用水源黑河与灞河水体中天然放射性元素铀含量进行了调查。

The investigation results on natural uranium concentrations in drinking water sources , Hei River and Ba River , in Xi'an City are presented in this paper .

月表物质与宇宙射线的相互作用，以及月表天然放射性元素的衰变都会产生伽玛射线。

Gamma-rays are emitted by the interactions of cosmic ray with lunar surface materials , and the decay of natural radioactive elements ( U , Th , K ) .

它不仅可用于测定环境天然放射性元素浓度，而且在核事故应急处理、核污染监测中具有重要意义。

It can be used not only to determination of contents of natural radioactive elements in environments , but also to monitoring nuclear pollution and emergency treatment in nuclear accidents significantly .

自然伽玛能谱测井仪是一种提供地下岩层的天然放射性总量及放射性元素铀、钍、钾丰度的仪器。

Nature gamma ray pedigree petroleum well logging is an instrument which can measure the gross content of natural radioactive element and the percent of such element as uranium , thorium , potassium in the stratum .

氡无色无味，是自然界唯一的天然放射性惰性气体，是由天然放射性元素镭经过α衰变产生。

Radon , colorless and tasteless , is the only natural radioactive inert gas , produced by α decay of natural radioactive elements radium .