查询词典 uranium-actinium

Only two, neptunium (93) and plutonium (94), occur in nature, and only as traces in uranium ores as a result of neutron irradiation.

自然界里只有錼(93)和钸(94)两种超铀元素，而且只以痕量存在于铀的矿物中，是受中子辐照后的产物。

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。

By analyzing radionuclides such as uranium, neptunium and plutonium in environmental samples, which were collected in the immediate environment of a nuclear process or nuclear site, researchers can detect evidence of the corresponding nuclear activities.

随着核能的开发应用，为评价放射性废物对环境的影响及确定放射性废物安全处置方案，长寿命放射性核素的环境行为越来越受到各国环境科学工作者的关注。

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。

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。

Do you know a ton of uranium 235 heavy nuclear fission can produce many energy?

你知道一吨浓缩铀235的重核裂变能产生多少能量吗？

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。