查询词典 sealed radioactive source

Each element has at least one isotope with unstable nuclei that can undergo radioactive decay .

每个元素至少有一个同位素不稳定原子核可以进行放射性衰变。

Tp the time required for one-half of the atoms in a group of radioactive atoms to decay.

放射性药物radiopharmaceuticals是指药物的本身含有放射性核素，用于人体疾病的诊断与治疗的特殊药物。

Scientists now believe it is a combination of radioactive decay and tidal heating [ 59 ] [ 60 ] , as tidal heating alone is not enough to explain the heat.

科学家现在相信，这是放射性衰变和潮汐热 [59] [60]的组合，如潮汐热不足以解释热量。

Such superheavy elements are usually very radioactive and decay away almost instantly.

这种超重元素通常是具有非常强的放射性，并且几乎立即会发生衰变。

Chemistry also uses calculus in determining reaction rates and radioactive decay.

化学也使用演算在确定反应速率和放射性衰变。

From their work emerged the picture of radioactive decay that is still valid-a violently disruptive explosion of a single atom.

根据他们的工作，展现出至今仍然成立的关于放射性衰变的图象--单个原子的强烈的分裂性爆炸。

I am convinced that only a few psychopaths would wish to return to the daily dread of radioactive disintegration.

" - 108我深信，只有少数精神病患者希望恢复到每天害怕放射性解体"-1 08

The spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation.

伴随有离子射线释放的一种放射性物质自发的瓦解过程。

The most probable explanation of radioactive disintegration is to be found in terms of the modern ideas concerning the structure of matter.

必须根据物质结构的现代观点才能更好地阐明放射性裂变现象。

Practically every atom had its origin in the tiny violence of a radioactive disintegration some time within the past few billion years.

实际上每个原子都来源于过去几十亿年中某一时刻放射性分裂的微小激变。

Nowadays, most of research are to build a transmutative Petri Nets through adding controlling place sets, controlling arc sets and controlling policy to the basic Petri Nets, while the Controlled Petri Nets could be used to argue many controlling theory problems conveniently and to induce many logically and physically supervisory and solve the Event Feedback Controlling Problems and State Feedback Controlling Problem in DEDS supervisory theory.

目前大多数的研究表现为在变形后的受控Petri网基础上，利用各种方法求得各种逻辑型、结构型控制器，解决DEDS监控理论中的事件反馈控制问题与状态反馈控制问题。

On one hand, there are discussions with the works council and union about extension of short time working up to the end of September.

一方面，有讨论，工程理事会和联盟关于延长工作时间短至9月底。