caesium

简明释义

英[ˈsiːziəm]美[ˈsiːziəm]

n. 铯（等于 cesium）

英英释义

单词用法

同义词

反义词

例句

1.Thee Caesium-137 may be buried in a scrap yard under tonnes of metal, and local officials believe it could have been melted down.

这块丢失的铯-137可能埋在一个废置场，压在几吨废金属下面；当地官员认为这块材料可能已经被熔化了。 。

2.Radionuclides or isotopes for medical or industrial purposes, such as Cobalt 60, Caesium 131 and lodine 132.

放射性核素或核素用于医疗或工业目的，例如：钴60、铯131和碘132。

3.The main radionuclides representing health risk are radioactive caesium and radioactive iodine.

意味着健康威胁的主要的放射性核素包括放射性铯和放射性碘。

4.Thus, in 1967, SI adopted a more precise definition based on the frequency of the radiation a caesium atom emits when it flips between two energy states.

所以，在1967年，SI采用了一个更为精确的制定办法，该办法基于一个铯原子在两个能级之间跃迁时的辐射频率。

5.Meanwhile, these methods have been modified and improved by newly developed caesium magnetometers and by proton-procession magnetometers.

同时，磁法也由于铯磁力仪和质子旋进式磁力仪的发明而得以改进。

6.It is cool and filter the precipitated caesium dichloroiodide .

这是冷却，滤出沉淀的二氯碘化铯。

7.The results show that the efficiency approaches to that of the caesium thermionic energy converter.

结果表明其效率与铯热离子换能器相近。

8.Previous releases of radioactive iodine and caesium had shown that material from the core of at least one reactor has been released.

之前放射性的碘、铯的释放表明至少一个反应堆堆芯已被释放。

9.In laboratories, caesium is often used in experiments involving atomic interactions.

在实验室中，铯常用于涉及原子相互作用的实验。

10.The discovery of caesium has revolutionized the field of time measurement.

铯的发现彻底改变了时间测量领域。

11.The atomic clock uses a frequency standard based on the vibrations of caesium.

原子钟使用基于铯振动的频率标准。

12.Scientists are studying the properties of caesium for use in quantum computing.

科学家正在研究铯的特性，以便在量子计算中使用。

13.The caesium fountain clock is one of the most accurate timekeeping devices.

铯喷泉钟是最精确的计时设备之一。

作文

The element caesium (or 铯 in Chinese) is a fascinating and essential part of modern science. Discovered in 1860 by the German chemist Robert Bunsen and his colleague Gustav Kirchhoff, caesium has become a significant element in various fields, particularly in atomic clocks, which are crucial for global positioning systems (GPS) and telecommunications. Caesium is a soft, silvery-golden alkali metal that is highly reactive and has the atomic number 55. Its name is derived from the Latin word 'caesius,' meaning 'sky blue,' which refers to the bright blue lines in its spectrum.One of the most remarkable properties of caesium is its role in timekeeping. Atomic clocks that utilize caesium can measure time with incredible precision, making them the standard for defining the second. The International System of Units (SI) defines the second based on the vibrations of caesium atoms. Specifically, one second is defined as the duration of 9,192,631,770 cycles of radiation corresponding to the transition between two hyperfine levels of the ground state of caesium-133 atoms. This definition underscores the importance of caesium in our understanding of time and its measurement.In addition to its use in atomic clocks, caesium has applications in various fields, including geology and medicine. For example, caesium is used in oil drilling to create a dense fluid that helps to stabilize the wellbore. In medicine, radioactive isotopes of caesium, such as caesium-137, are utilized in cancer treatment through a process known as brachytherapy, where radioactive sources are placed close to or within tumor tissues.However, caesium also poses certain risks. Its high reactivity means that it must be handled with care, as it can react violently with water, producing hydrogen gas and heat. This reaction can lead to explosions if not managed properly. Additionally, the radioactive isotopes of caesium can pose health risks if they are not contained and disposed of safely. The incident at the Chernobyl nuclear power plant in 1986 released a significant amount of caesium-137 into the environment, leading to long-term contamination and health issues for the surrounding population.Despite these risks, the benefits of caesium in technology and medicine are undeniable. As we continue to explore the potential of this element, it is essential to balance its applications with safety measures to mitigate any hazards associated with its use. The ongoing research into caesium and its compounds may lead to new innovations and discoveries that could further enhance our lives. In conclusion, caesium is more than just a chemical element; it is a key player in the advancement of science and technology, shaping our understanding of time, improving medical treatments, and contributing to various industrial processes.

元素caesium（在中文中为铯）是现代科学中一个迷人且重要的部分。它于1860年由德国化学家罗伯特·本生和他的同事古斯塔夫·基尔霍夫发现，caesium已成为多个领域的重要元素，特别是在原子钟中，这对于全球定位系统（GPS）和电信至关重要。Caesium是一种软的、银金色的碱金属，反应性极强，原子序数为55。它的名称源自拉丁词'caesius'，意为'天蓝色'，这指的是其光谱中的明亮蓝色线条。Caesium最显著的特性之一是它在计时中的作用。利用caesium的原子钟可以以惊人的精度测量时间，使其成为定义秒的标准。国际单位制（SI）根据caesium原子的振动定义秒。具体而言，一秒被定义为对应于caesium-133原子基态两个超精细能级之间跃迁的辐射周期的9,192,631,770个周期的持续时间。这个定义强调了caesium在我们对时间及其测量的理解中的重要性。除了在原子钟中的应用外，caesium还广泛应用于地质和医学等多个领域。例如，caesium在石油钻探中用于制造一种密度大的流体，帮助稳定井壁。在医学上，放射性同位素caesium-137被用于癌症治疗，通过一种称为近距离放射治疗的过程，将放射源放置在肿瘤组织附近或内部。然而，caesium也存在一定的风险。它的高反应性意味着必须小心处理，因为它可能会与水发生剧烈反应，产生氢气和热量。如果不妥善管理，这种反应可能导致爆炸。此外，放射性同位素caesium如果没有安全处理和处置，也可能对健康构成风险。1986年切尔诺贝利核电站事故释放了大量caesium-137进入环境，导致长期污染和周围居民的健康问题。尽管存在这些风险，caesium在技术和医学中的益处是不可否认的。随着我们继续探索这种元素的潜力，平衡其应用与安全措施以减轻任何相关危害是至关重要的。对caesium及其化合物的持续研究可能会带来新的创新和发现，从而进一步改善我们的生活。总之，caesium不仅仅是一个化学元素；它是科学和技术进步的重要参与者，塑造了我们对时间的理解，改善了医疗治疗，并为各种工业过程做出了贡献。