Getter metals cesium

Cesium was first produced ia the metallic state by electrolysis of a molten mixture of cesium and barium cyanides (2). Subsequentiy the more common thermochemical—reduction techniques were developed (3,4). There were essentially no iadustrial uses for cesium until 1926, when it was used for a few years as a getter and as an effective agent ia reduciag the electron work function on coated tungsten filaments ia radio tubes. Development of photoelectric cells a few years later resulted ia a small but steady consumption of cesium and other appHcations for cesium ia photosensing elements followed. 

Both cesium and its compounds find practical nses. Cesium metal can be used as a getter to remove oxygen in phototubes. It is used in atomic clocks that are accurate to within five seconds per every three hxmdred years. (A second is defined as 9,192,631,770 oscillations of a Cs-133 atom.) Csl and CsF are used in scintillation counters to monitor ionizing radiation. CsCl is used to create density gradients for the separation and purification of DNA via ultracentrifugation, see also Alkali Metals Bunsen, Robert. 

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