1.
thorium lead age
钍 铅法测得的年龄
2.
protactinium-231-thorium-230 dating
镤-231钍-230测年法
3.
A radioactive isotope of thorium with mass number228.
射钍钍的放射性同位，质量数为
4.
Determination of thorium in uranium ore concentrate by thorin photometric method
GB/T11848.11-1989铀矿石浓缩物中钍的测定钍试剂光度法
5.
Methods for chemical analysis of thorium nitrate--Determination of thorium content
GB/T16478.2-1996硝酸钍化学分析方法钍量的测定
6.
Determination of thorium dioxide in thorium-tungsten alloys--Weight method
GB/T3312-1982钨钍合金中二氧化钍的测定重量法
7.
fertile thorium 232.
能产生裂变物质的钍232
8.
Either of two decay products of thorium, mesothorium I, an isotope of radium, or mesothorium II, an isotope of actinium.
新钍钍的两种放射性生成物之一，即新钍1号，它是镭的同位素，或新钍2号，它是锕的同位素
9.
Methods for chemical analysis of thorium nitrate--Determination of lead content
GB/T16478.11-1996硝酸钍化学分析方法铅量的测定
10.
Research of Characteristic for Hg-Pb-Th Contents in Rare Earth Mine;
稀土矿中汞、铅、钍的含量特征研究
11.
a radioactive mineral consisting of thorium silicate; it is a source of thorium that is found in coarse granite.
一种放射性矿物，由硅酸钍组成，是钍的来源，见于粗糙的花岗岩中。
12.
Analytical method of thorium in water
GB/T11224-1989水中钍的分析方法
13.
Studies on the Adsorptive Stripping Voltammetry of Sc (Ⅲ)、Th(Ⅳ) complexs;
钪（Ⅲ）、钍（Ⅳ）络合物的吸附伏安法研究
14.
They recognized that in a thorium province Pb208 would present complications.
他们承认，含钍区内的Pb208会产生干扰。
15.
The daughter nuclides of radon and thoron tend to become attached.
氡和钍射气的子体易被气溶胶吸附。
16.
Synthesis and Characterization of Uranium, Thorium and Raer Earth Complexes of Schiff Base;
铀、钍、稀土希夫碱配合物的合成与表征
17.
U,Cu,Pb,Zn and Tu in 1:50000 regional geochemistry sample by scattering background internal standard method
散射背景内标法测定1:5万区域地球化学调查样品中铀、铜、铅、锌、钍
18.
Methods for chemical analysis of thorium nitrate--Determination of chlorine content
GB/T16478.5-1996硝酸钍化学分析方法氯量的测定