^ a b # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).^ ( ) spin value – Indicates spin with weak assignment arguments.^ Bold symbol as daughter – Daughter product is stable.^ Bold italics symbol as daughter – Daughter product is nearly stable.^ # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).^ ( ) – Uncertainty (1 σ) is given in concise form in parentheses after the corresponding last digits. As a result, the input function of these isotopes can be estimated as a function of time. Once caesium enters the ground water, it is deposited on soil surfaces and removed from the landscape primarily by particle transport. All other isotopes have half-lives less than 2 weeks, most under an hour.īeginning in 1945 with the commencement of nuclear testing, caesium radioisotopes were released into the atmosphere where caesium is absorbed readily into solution and is returned to the surface of the Earth as a component of radioactive fallout. With a half-life of 30.1671 years and 134Cs with a half-life of 2.0652 years. The longest-lived radioisotopes are 135Cs with a half-life of 2.3 million years, 137 The atomic masses of these isotopes range from 112 to 151. Caesium ( 55Cs) has 40 known isotopes, making it, along with barium and mercury, one of the elements with the most isotopes.
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