Cesium CAS 7440-46-2

Fission products
The long-lived cesium-137 is a fission product of uranium-235. Half-life 30.17 years, can radiate β rays and γ rays, used as a β and γ radiation source, used in industry, agriculture and medical treatment. With the time spent in storage of radioactive waste from nuclear fuel, the proportion of γ rays radiated by it increases and is the main object of storage. [4]
Ion rockets
To explore the universe, there must be a new, fast means of transportation. Ordinary rockets and spacecraft cannot reach such a speed, and can only rush out of the Earth-Moon system at most; Only the “ion rocket” that can more than 100,000 kilometers per hour can meet the requirements. [5] [3]
The outermost electrons of cesium atoms are unstable, and they are excited to radiate out and become charged cesium ions, so they are the ideal “fuel” for spaceflight ion rocket engines. The working principle of cesium ion rocket: after the engine starts, a large amount of cesium vapor is generated, and the cesium vapor is “processed” by the ionizer to become a charged cesium ion, and then accelerated to one hundred and fifty kilometers per second under the action of the magnetic field, which is sprayed out from the nozzle, and at the same time gives the ion rocket a strong thrust to push the rocket height forward. [5] [3]
Calculations have shown that using this cesium ion as a propellant for cosmic rockets produces a thrust hundreds of times higher per unit weight than the liquid or solid fuel used. This cesium ion rocket can travel in space for a year or two or more! [5] [3]
atomic clock
The outermost electrons of the cesium atom rotate around the nucleus at a speed that is always precise in a few billionths of a second, with much greater stability than the Rotation of the Earth around the axis. Taking advantage of this feature of the cesium atom, a new type of clock, the cesium atomic clock, was made, which specified that one second was the time required for the cesium atom to “vibrate” 9192631770 times (that is, the 9192631770 times equal to the two ultra-fine electron transitions of the cesium atom). This is the latest definition of “seconds”. [5] [3]
Using cesium atomic clocks, one can measure a billionth of a second of time with great precision, far more and than any before existing table in the world, and beyond the astronomical time that has been based on the Rotation of the Earth for many years. With clocks such as cesium atomic clocks, it is possible for humans to engage in more elaborate scientific research and production practices, such as the explosion of atomic and hydrogen bombs, the launch of rockets and missiles, and space navigation, etc., to put in place precise control, of course, can also be used for long-distance flight and navigation. An atomic clock made of cesium can measure a moment of one billionth of a second, it has been going on for 300,000 years, and the error is not more than 1s, and the accuracy is quite high. Besides, cesium is used in medicine, missiles, spacecraft and various high-tech industries.