放射性元素

A radioactive transuranic element synthesized by bombarding ''.

一种放射性超铀元素，用碳离子轰击''。

A radioactive transuranic element produced by bombarding plutonium with neutrons.

一种放射性超铀元素，用中子轰击钚时产生。

A radioactive transuranic metallic element; produced by bombarding plutonium with helium nuclei.

一种放射性超铀元素，在用氦核子轰击钚时发现。

A radioactive transuranic element synthesized by bombarding einsteinium with alpha particles.

一种放射性超铀元素，用α粒子轰击锿而合成。

A radioactive transuranic metallic element produced by bombarding plutonium with neutrons.

一种放射性超铀元素，用中子轰击钚时产生。

A short - lived , radioactive synthetic transuranic element produced from californium and having

铹一种寿命期短的、人工合成的放射性超铀元素，从锎中生成，有质量从255到260的同位素，半衰期从几秒钟到三分钟；原子序数

Superscript 525 Californium is the only one man-made radiosotope emitted neutrons which can be used clinically for brachytherapy.

(上标 252)鉲是唯一放射中子的人造放射性同位元素，在临床上用作短距离放疗。

Element synthesized from californium.

一种放射性超铀元素，由锎合成。

As hydrogen atoms and catalyst atoms are normally found bound together as molecules or are bound in other compositions of matter, BlackLight has invented a solid fuel that uses conventional chemical reactions to generate the catalyst and atomic hydrogen at high reactant densities that in turn controllably achieves very high power densities.

通过分离出该进程中的能量产物，用外界元素中电解水。使用水作为燃料，不可见光发电机的可用成本是不昂贵的，而且，他不会带来空气污染或者放射性废物，还具有商业使用价值的氢成分作为氢产物。

Ca is widely abundant in nature and its rodioisotope 41 Ca is a cosmogenic nuclide with a half\|life of 10 5 years. However, the 41 Ca/ 40 Ca ratio in natural samples is very low and can only be measure d by accelerator mass spectrometry. The application of 41 Ca is ve ry i mportant not only in the life science but also in geological dating, global envi ronment change studies and astrophysics.

1 引言Ca在自然界中广泛存在，它不仅是人体中含量最丰富的元素之一[1] ，也是众多其他物质的组成部分。41Ca(半衰期为 1.0 3× 10 5a)属于Ca的放射性同位素中的一种，其衰变方式为轨道电子俘获，只发射3.3keV的X射线，天然样品中41Ca 40 Ca的值很小。

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。