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Caesium (55 Cs) has 41 known isotopes, the atomic masses of these isotopes range from 112 to 152. Only one isotope, 133 Cs, is stable. The longest-lived radioisotopes are 135 Cs with a half-life of 1.33 million years, 137 Cs with a half-life of 30.1671 years and 134 Cs with a half-life of 2.0652 years. All other isotopes have half-lives less ...
The radioactive 135 Cs has a very long half-life of about 2.3 million years, the longest of all radioactive isotopes of caesium. 137 Cs and 134 Cs have half-lives of 30 and two years, respectively. 137 Cs decomposes to a short-lived 137m Ba by beta decay, and then to nonradioactive barium, while 134 Cs transforms into 134 Ba directly. The ...
This is a list of radioactive nuclides (sometimes also called isotopes), ordered by half-life from shortest to longest, in seconds, minutes, hours, days and years. Current methods make it difficult to measure half-lives between approximately 10 −19 and 10 −10 seconds.
Caesium-134 is found in spent nuclear fuel but is not produced by nuclear weapon explosions, as it is only formed by neutron capture on stable Cs-133, which is only produced by beta decay of Xe-133 with a half-life of 3 days. Cs-134 has a half-life of 2 years and may be a major source of gamma radiation in the first 20 years after discharge.
After entering the body, caesium gets more or less uniformly distributed throughout the body, with the highest concentrations in soft tissue. [17]: 114 However, unlike group 2 radionuclides like radium and strontium-90, caesium does not bioaccumulate and is excreted relatively quickly. The biological half-life of caesium is about 70 days. [18]
[65] Iodine-131 has a half-life of 8 days while caesium-137 has a half-life of over 30 years. The IAEA has developed a method that weighs the "radiological equivalence" for different elements. [ 73 ] TEPCO has published estimates using a simple-sum methodology, [ 74 ] [ 75 ] As of 25 April 2012 [update] TEPCO has not released a total water and ...
The IFC said the seawater and marine life would be fine and that no additional impact studies were needed. World Bank Group President Jim Yong Kim signed off on the IFC’s response without comment. Since then, human-rights groups and other NGOs around the world have targeted Kim with letters protesting his rejection of his own watchdog unit ...
Nonradioactive 133 Cs capturing a neutron and becoming 134 Cs, which is radioactive with a half-life of 2 years Many of the fission products with mass 147 or greater such as 147 Pm , 149 Sm , 151 Sm , and 155 Eu have significant cross sections for neutron capture, so that one heavy fission product atom can undergo multiple successive neutron ...