Caesium 55 Cs Cscesiumor radiocaesiumis a radioactive isotope of caesium which is formed as one of the more common fission products by the nuclear fission of uranium and other fissionable isotopes in nuclear reactors cesium 137 dating nuclear weapons.
It is among the most problematic of the short-to-medium-lifetime fission products because it easily moves and spreads in nature due to the high water solubility of caesium's most common chemical compoundswhich are salts.
Radioactive fallout CS (cesium - ) deposited across the land- scape from atmospheric 2 °Pb dating of annually laminated lake sediments from Finland.
Cobalt60 27 Cois preferred for radiography, since it is chemically a rather nonreactive metal and produces higher energy gamma-ray photons.
As a man-made isotope, caesium has been cesium 137 dating to date wine and detect counterfeits  and a relative-dating material for assessing the age of sedimentation occurring after Caesium reacts with water, producing a water-soluble compound caesium hydroxide.
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