铀

The concentration of neptunium and plutonium is extremely low in environmental samples. Additionally such samples have a complex matrix composition, which is to be taken into account for a proper analysis.

环境样品基体复杂，铀、镎和钚等锕系元素含量非常低，在复杂的生态条件下，这些核素常常具有复杂多变的化学形态，要准确测定其含量，必须要有灵敏可靠的检测方法。

Since 1980s, ICP-MS has been used overseas for the determination of uranium, thorium, neptunium, and plutonium in environmental samples. ICP-MS is one of the most suitable analysis techniques for the measurement of the long-lived radionuclides.

自八十年代以来，国外对ICP-MS测量环境样品中的铀、钍、镎和钚的研究表明，ICP-MS在测量长寿命放射性核素方面是最有发展前景的测量技术之一。

She assumptions Road: Emilio segre should have found the first transuranic element neptunium, if he is not a lack of adequate knowledge of chemical and rare earth elements to make mistakes to 23,993 words; Similarly, Enrico Fermi should have been found in fission, if his team The chemical separation technology is not quite so appropriate.

她假设道：Emilio segre本应当发现第一个超铀元素镎，如果他不是缺少足够的化学知识而把23993错认作稀土元素的话；与此相似，Enrico Fermi本应该发现裂变，如果他的研究小组的化学分离技术不是这样不甚适当的话。

Within the range of 1 X 10-8~9.72 10-10 g/ml, the concentration of Np and intensity to the fluorescence of Tiron-Tb present relations of linearity, the detection limit for Np is 0.127ng/ml, nearly 1000 times high of uranium does not interfere the determination of the neptunium.

在1×10~(-8)～9.72×10~(-10)g／ml范围内，Np的浓度与Tiron-Tb的相对荧光强度呈线性关系，方法检出限：1.27×10~(-10)g／ml，将近1000倍的铀存在时不产生干扰。

Neptunium is a very poisonous long-lived transuranium element.

镎是一个极毒的超铀元素，寿命长T_(12=2.14×10~6a。

Measurements were also completed for neutron flux distribution and average fission fraction of 235U isotope in depleted uranium sphere.

测量了14MeV中子通量分布和贫化铀球中~(235)U同位素的平均裂变数。

A yellow salt obtained by the reaction of uranium salts with nitric acid.

一种黄色的盐，由铀盐与硝酸反应产生。

The monitoring results of radioactive and nonradioactive harmful materials in the environment surrounding a uranium tailing pool are reported.

本文报道了铀水冶尾矿库环境中的放射性和非放射性有害物质的监测结果。

The determination method of 237 Np in the large amount of uranium by γ spectrum is developed.

研究建立了γ谱法直接测定大量铀溶液中2 3 7Np的方法。

One of the methods to set free the energy locked in such substances as uranium is known as nuclear fission.

一种把储存在象铀这样的物质里面的能量释放出来的方法被称为核裂变。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。