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Metastable isomeric transition is the only nuclear decay mode that approaches pure gamma emission. 99m Tc's half-life of 6.0058 hours is considerably longer (by 14 orders of magnitude, at least) than most nuclear isomers, though not unique.
A nuclear isomer is a metastable state of an atomic nucleus, in which one or more nucleons (protons or neutrons) occupy excited state levels (higher energy levels). ). "Metastable" describes nuclei whose excited states have half-lives 100 to 1000 times longer than the half-lives of the excited nuclear states that decay with a "prompt" half life (ordinarily on the order of 10
A Tc-99m pertechnetate solution is being eluted from Mo-99 molybdate bound to a chromatographic substrate. A technetium-99m generator, or colloquially a technetium cow or moly cow, is a device used to extract the metastable isotope 99m Tc of technetium from a decaying sample of molybdenum-99.
The decay scheme of a radioactive substance is a graphical presentation of all the transitions occurring in a decay, and of their relationships. Examples are shown below. It is useful to think of the decay scheme as placed in a coordinate system, where the vertical axis is energy, increasing from bottom to top, and the horizontal axis is the proton number, increasing from left to right.
Its low-energy isomeric transition, which yields a gamma-ray at ~140.5 keV, is ideal for imaging using Single Photon Emission Computed Tomography (SPECT). Several technetium isotopes, such as 94m Tc, 95 Tc, and 96 Tc, which are produced via (p,n) reactions using a cyclotron on molybdenum targets, have also been identified as potential Positron ...
Technetium-99 (99 Tc) is an isotope of technetium that decays with a half-life of 211,000 years to stable ruthenium-99, emitting beta particles, but no gamma rays.It is the most significant long-lived fission product of uranium fission, producing the largest fraction of the total long-lived radiation emissions of nuclear waste.
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Internal conversion is favored whenever the energy available for a gamma transition is small, and it is also the primary mode of de-excitation for 0 + →0 + (i.e. E0) transitions. The 0 + →0 + transitions occur where an excited nucleus has zero-spin and positive parity , and decays to a ground state which also has zero-spin and positive ...