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Electron capture is always an alternative decay mode for radioactive isotopes that do have sufficient energy to decay by positron emission. Electron capture is sometimes included as a type of beta decay, [1] because the basic nuclear process, mediated by the weak force, is the
K/L capture; Isomeric. Gamma γ ... electron. 2× ; neutron. s; r; proton. p; rp ... These equations need to be refined such that the notation is defined as has been ...
In about 89.28% of events, it decays to calcium-40 (40 Ca) with emission of a beta particle (β −, an electron) with a maximum energy of 1.31 MeV and an antineutrino. In about 10.72% of events, it decays to argon-40 (40 Ar) by electron capture (EC), with the emission of a neutrino and then a 1.460 MeV gamma ray.
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 ...
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.
The analogous calculation for electron capture must take into account the binding energy of the electrons. This is because the atom will be left in an excited state after capturing the electron, and the binding energy of the captured innermost electron is significant. Using the generic equation for electron capture A Z X + e − → A Z−1 X ...
During the formation of neutron stars, or in radioactive isotopes capable of electron capture, neutrons are created by electron capture: p + e − → n + ν e. This is similar to the inverse beta reaction in that a proton is changed to a neutron, but is induced by the capture of an electron instead of an antineutrino.
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).