放射性元素

"For the invention and development of the cyclotron and for results obtained with it, especially with regard to artificial radioactive elements"

"对回旋加速器的发明和发展，并以此获得有关人工放射性元素的研究成果"

A highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium.

一种极不稳定的放射性元素，铀和钍腐烂的产物。

Fluosilicic acid,which is the byproduct from phosphate fertilizer factory,reacts with ammonium hydrocarbonate to obtain ammonium fluosilicate,then reacts with ammonium carbonate to form settled SiO 2,after filtration,water washing,drying and calcining,high purity SiO 2 with less than 10×10 -6 metal impurity and less than 10×10 -9 uranium and thorium respectively is made.

由磷肥厂副产氟硅酸同碳铵反应得氟硅酸铵，再和碳铵反应生成SiO2 沉淀，经过滤、水洗、干燥、煅烧得高纯SiO2 ，其金属杂质总含量小于 10× 10 -6，含放射性元素铀和钍各小于 10× 10 -9，通过实验获得了适宜的工艺条件，反应温度 70℃～ 80℃，反应时间 1 5h～ 2 0h ，配料比n(NH4HCO3 )∶n(NH4 2 SiF6 =4 4。

While the uranyl ion and the hydronium ion tend to dissolve in water, the effect of ancient underground water leads to the redistribution and movement of the elements of uranium and kalium, the ratio of thorium to uranium and kalium are changed.

为了需求古地下水的运移规律及对寻找矿床的作用，利用放射性元素钍稳定性的特点，建立了钍归一化判断的数学模型。

An agent, such as ultraviolet light or a radioactive element, that can induce or increase the frequency of mutation in an organism.

诱变剂有机体中的一种可诱发或者增加突变的次数的因子，如紫外线或放射性元素

"For his discovery, by means of his mass spectrograph, of isotopes, in a large number of non-radioactive elements, and for his enunciation of the whole-number rule"

1922年弗朗西斯·阿斯顿英国"使用质谱仪发现了大量非放射性元素的同位素，并且阐明了整数法则"

Petrographically and mineralogically similar rocks quite often have different concentrations of radioactive elements.

岩石学矿物学上类似的岩石，其放射性元素丰度却往往有所不同。

He won a 922 Nobel Prize for developments that led to the discovery of isotopes in nonradioactive elements.

他因在非放射性元素的同位素的发现过程中取得重大进展而获922年诺贝尔奖

He won a1922Nobel Prize for developments that led to the discovery of isotope s in nonradioactive elements.

他因在非放射性元素的同位素的发现过程中取得重大进展而获1922年诺贝尔奖

In July 1898, Madame Curie and her husband got a great success that they discovered the radioactive element, polonium.

1898年7月，居里夫人和她的丈夫获得了很大的成功—他们发现了放射性元素钋。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了