Caesium - Wikipedia
A release of 40 TBq of caesium and strontium is, however, serious (when compared Dating Cave Ice Deposits In case of areas affected by both fallout events, the presence of Am can help distinguish between the time markers, as this . the presence of long-standing radionuclides (e.g. cesium and cesium Properties, sources and uses of the element cesium. The official definition of a second is the time it takes for the cesium atom to The idea for using cesium- brachytherapy seeds as a treatment for cancer dates back to. Chemical Names: Cesium; Caesium; Cesium, isotope of mass ; Modify Date: ; Create Date: .. the difference in the biological half-time of cesium at a confidence level of 90% was not significant Radioactive isotopes of cesium such as cesium and cesium are produced by.
It has a density of nearly twice that of water, and is very ductile. Just the facts Atomic number number of protons in the nucleus: Cs Atomic weight average mass of the atom: There are also at least 39 artificial isotopes created in a lab. Cs percent of natural abundance Electron configuration and elemental properties of cesium.
Facts About Cesium
It was discovered in by German chemists Robert Bunsen and Gustav Kirchhoff when they were analyzing the spectrum of mineral water, according to WebElements. The first practical applications of cesium were realized in the s, according to the USGS.
Cesium was used in vacuum tubes to remove traces of remaining oxygen due to its ready nature to bond with it, and as a coating on heated cathodes to increase the electric current. In later decades, more uses for cesium arose, including photoelectric cells, spectrometers and catalysts for organic reactions.
The high cost of cesium and the growing popularity of similar and cheaper technologies using other alkali metals reduced the use of cesium to a handful of applications. Cesium is an alkali metal, along with lithium, sodium, potassium, rubidium and francium.
Alkali metals are highly reactive, have one electron in their outer shell, and do not occur freely in nature, according to ChemicalElements. These metals are also very malleable, ductile and good heat and electrical conductors.
Cesium is incredibly accurate at timekeeping and is used in atomic clocks. The official definition of a second is the time it takes for the cesium atom to vibrate 9,, times between energy levels.
Cesium-based atomic clocks lose one second per million years.
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- Isotopes of caesium
Cesium is one of four metals that are liquid at or near room temperature; the others are mercury melting point of minus According to Chemicoolthe abundance of cesium in Earth's crust is about 3 parts per million by weight, and in the solar system 8 parts per billion by weight. Cesium is highly reactive and combines readily with other elements, especially oxygen and other gases, and nonmetals, according to Encyclopedia Britannica.
Because cesium reacts violently with water, it is treated as a hazardous material and is often kept under a layer of kerosene or mineral oil or in a vacuum to prevent it from reacting and igniting due to the moisture in the air.
This procedure has been used by researchers to check the authenticity of certain rare wines, most notably the purported " Jefferson bottles ". This led to four confirmed deaths and several serious injuries from radiation contamination. It is believed that the capsule, originally a part of a measurement device, was lost in the late s and ended up mixed with gravel used to construct the building in Over 9 years, two families lived in the apartment.
Cesium CS | Cs - PubChem
By the time the capsule was discovered, 6 residents of the building had died from leukemia and 17 more had received varying doses of radiation. They were eventually traced back to training sources abandoned, forgotten, and unlabeled after the dissolution of the Soviet Union.
One was a Cs pellet in a pocket of a shared jacket which put out abouttimes the level of background radiation at 1 meter distance.
This caused some caesium from a measuring instrument to be included with eight truckloads of scrap metal on its way to a steel millwhere the radioactive caesium was melted down into the steel. The samples were moved out of a secure location to be used for education. When the samples were supposed to be returned the university was unable to find them.
An investigation by the agency traced the source to a building from which STUK and a radioactive waste treatment company operate.