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Caesium-137 (137 55 Cs ), cesium-137 (US), [ 7 ] or radiocaesium , is a radioactive isotope of caesium that is formed as one of the more common fission products by the nuclear fission of uranium-235 and other fissionable isotopes in nuclear reactors and nuclear weapons .
Caesium-137 does not emit gamma radiation directly, all observed radiation is due to the daughter isotope barium-137m. 137 Cs has a very low rate of neutron capture and cannot yet be feasibly disposed of in this way unless advances in neutron beam collimation (not otherwise achievable by magnetic fields), uniquely available only from within ...
137 curium-248m: 146 neptunium-219: 150 astatine-212m2: 152 polonium-214: 164.3 radon-207m: 181 bismuth-207m: 182 darmstadtium-270: 205 berkelium-250m2: 213 darmstadtium-269: 230 lead-178: 230 copernicium-277: 240 thorium-217: 240 darmstadtium-273: 240 berkelium-249m: 300 astatine-216: 300 bismuth-187m1: 320 nihonium-278: 340 hassium-265m: 360 ...
Caesium-137 has been used in hydrologic studies analogous to those with tritium. As a daughter product of fission bomb testing from the 1950s through the mid-1980s, caesium-137 was released into the atmosphere, where it was absorbed readily into solution. Known year-to-year variation within that period allows correlation with soil and sediment ...
Caesium-137 is one such radionuclide. It has a half-life of 30 years, and decays by beta decay without gamma ray emission to a metastable state of barium-137 (137m Ba). Barium-137m has a half-life of a 2.6 minutes and is responsible for all of the gamma ray emission in this decay sequence. The ground state of barium-137 is stable.
A mining company dropped a tiny capsule of caesium-137 somewhere along an 870-mile stretch of Western Australia’s Great Northern Highway. The plan is to find it before someone gets hurt, Liam ...
OSLO (Reuters) -Norway said on Wednesday that elevated levels of radioactive caesium (Cs-137) it had detected near the Arctic border with Russia were likely due to a forest fire near Chornobyl in ...
Sometime between 10 and 16 January 2023, a radioactive capsule containing caesium-137 was lost from a truck in Western Australia.The capsule was being transported 1,400 kilometres (870 mi) from Rio Tinto's Gudai-Darri iron ore mine near Newman to a depot in the Perth suburb of Malaga.