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Iodine-135 is an isotope of iodine with a half-life of 6.6 hours. It is an important isotope from the viewpoint of nuclear reactor physics . It is produced in relatively large amounts as a fission product , and decays to xenon-135 , which is a nuclear poison with the largest known thermal neutron cross section , which is a cause of multiple ...
Iodine pit behavior is not observed in reactors with neutron flux density below 5×10 16 neutrons m −2 s −1, as the 135 Xe is primarily removed by decay instead of neutron capture. As the core reactivity reserve is usually limited to 10% of Dk/k, thermal power reactors tend to use neutron flux at most about 5×10 13 neutrons m −2 s −1 ...
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1.19 francium-212: 20.0 1.20 curium-237: 20 1.2 carbon-11: 20.334 1.2200 plutonium-233: 20.9 1.25 thorium-233: 21.83 1.310 francium-223: 22.00 1.320 americium-247: 23.0 1.38 uranium-239: 23.45 1.407 radon-212: 23.9 1.43 radon-223: 24.3 1.46 radon-208: 24.35 1.461 protactinium-235: 24.44 1.466 bismuth-199m1: 24.70 1.482 bismuth-212m1: 25.0 1.50 ...
However, only the decay of 125 Xe leads to a radioiodine: 125 I. The other xenon radioisotopes decay either to stable xenon, or to various caesium isotopes, some of them radioactive (a.o., the long-lived 135 Cs (t ½ = 1.33 Ma) and 137 Cs (t ½ = 30 a)). Long irradiation times are disadvantageous.
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).
Because 95% of the xenon-135 production is from iodine-135 decay, which has a 6- to 7-hour half-life, the production of xenon-135 remains constant; at this point, the xenon-135 concentration reaches a minimum. The concentration then increases to the equilibrium for the new power level in the same time, roughly 40 to 50 hours.
Interatomic Coulombic decay (ICD) [1] is a general, fundamental property of atoms and molecules that have neighbors. Interatomic (intermolecular) Coulombic decay is a very efficient interatomic (intermolecular) relaxation process of an electronically excited atom or molecule embedded in an environment.