Fission products
Long-lived
cesium-137 is a fission product of uranium-235 . Half-life of 30.17 years , radiation β -rays and γ -rays, β and γ radiation source used for industry, agriculture and health . As the nuclear fuel radioactive waste storage time , the radiation increase in the proportion of γ -rays ; was the main target of storage .
Ion rocket
In order to explore the universe , there must be a new, flying very fast transport. General rocket , the spacecraft will reach this speed, maximum out of the Earth-Moon system ; Only hourly able to fly hundreds of thousands kilometers of "ion rocket " in order to meet the requirements.
Cesium atoms outermost electron is very unstable and can easily be stimulated emission out , becomes positively charged cesium ions , it is ideal Astronautical ion rocket engine "fuel ." Cesium ion rocket works like this: After starting the engine , resulting in a large number of cesium vapor , cesium vapor through the ionizer of the " processing" , becomes positively charged cesium ions , and then accelerated under the action of a magnetic field to each second one hundred and fifty kilometers , ejected from the nozzle , while giving a strong impetus ion rocket , the rocket height forward.
Calculations show that , with this cesium ions for space rocket propellant , the thrust generated by unit weight than using liquid or solid fuel a hundred times higher . The cesium ions in the universe, space travel may rocket in 2012 or even longer !
Atomic Clock
Cesium atoms outermost electron around the nucleus rotation speed , always extremely accurate in the tens of billionths of a second of time completes a full revolution , more stable than the Earth around its axis is much higher. The use of this feature of cesium atoms , people made a new kind of bell - cesium atomic clock, cesium atoms is required one second "vibration " 9192601770 times ( which is equivalent to two hyperfine cesium atom electron Warp 9192601770 times ) the desired time. This is the " second " the latest definitions.
A cesium atomic clock , one can very accurately measure the nanosecond time accuracy and stability far more than the world ever had any kind of form, but also over many years has been to make the Earth's rotation benchmark astronomical time . With such a class as cesium atomic clocks , humans are more likely to engage in scientific research and production practice fine , such as the atomic bomb and hydrogen bomb explosions , rockets and missile launch and astronautics , etc., to implement highly accurate control , of course, can also be used for remote flying and sailing . Made with a cesium atomic clock , can accurately measure the nanosecond the moment, it took thirty years continuously , the error does not exceed 1s, accuracy is very high , in addition , cesium in medicine , missiles , spacecraft and various high-tech industries are widely used .
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Metal oxide materials
