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The leading-order Feynman diagrams for electron capture decay. An electron interacts with an up quark in the nucleus via a W boson to create a down quark and electron neutrino . Two diagrams comprise the leading (second) order, though as a virtual particle , the type (and charge) of the W-boson is indistinguishable.
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The electron capture detector is used for detecting electron-absorbing components (high electronegativity) such as halogenated compounds in the output stream of a gas chromatograph. The ECD uses a radioactive beta particle (electron) emitter in conjunction with a so-called makeup gas flowing through the detector chamber.
The electron capture produces a tellurium-125 nucleus in an excited state with a half-life of 1.6 ns, which undergoes gamma decay emitting a gamma photon or an internal conversion electron at 35.5 keV. A second electron relaxation cascade follows the gamma decay before the nuclide comes to rest.
Resonance electron capture [3] is also known as nondissociative EC. The compound captures an electron to form a radical anion. [4] The energy of the electrons are about 0 eV. The electrons can be created in the Electron Ionization source with moderating gas such as H 2, CH 4, i-C 4 H 10, NH 3, N 2, and Ar. [5] After the ion captures the electron, the complex formed can stabilize during ...
Iodine-123 (123 I) is a radioactive isotope of iodine used in nuclear medicine imaging, including single-photon emission computed tomography (SPECT) or SPECT/CT exams. The isotope's half-life is 13.2232 hours; [1] the decay by electron capture to tellurium-123 emits gamma radiation with a predominant energy of 159 keV (this is the gamma primarily used for imaging).
Fourteen isotopes have been experimentally observed undergoing two-neutrino double beta decay (β – β –) or double electron capture (εε). [11] The table below contains nuclides with the latest experimentally measured half-lives, as of December 2016, except for 124 Xe (for which double electron capture was first observed in 2019). Where ...
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