nuclear isomer वाक्य
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- However, radioactivity of this nuclear isomer has never been observed, and only a lower limit on its half life of 2.0 ?10 16 years has been set.
- Nuclear isomers are members of a set of nuclides with equal proton number and equal mass number ( thus making them by definition the same isotope ), but different states of excitation.
- Tc-99m's half life of 6.0058 hours is considerably longer ( by 14 orders of magnitude, at least ) than most nuclear isomers, though not unique.
- All atoms of a given element are not necessarily identical, however, as the number of neutrons may vary to form different isotopes, and energy levels may differ forming different nuclear isomers.
- There are also 17 nuclear isomers, with half lives of up to 154 days . Tellurium ( 106 Te to 110 Te ) is among the lightest elements known to undergo alpha decay.
- The ground state of 180 Ta has a half life of only 8 hours . 180m Ta is the only naturally occurring nuclear isomer ( excluding radiogenic and cosmogenic short-living nuclides ).
- The most long-lived non-ground state nuclear isomer is the nuclide tantalum-180m ( ), which has a half-life in excess of 1, 000 trillion years.
- The longer lives of nuclear isomers ( metastable states ) are often due to the larger degree of nuclear spin change which must be involved in their gamma emission to reach the ground state.
- One isotope, 229 Th, has a nuclear isomer ( or metastable state ) with a remarkably low excitation energy, recently measured to be 7.6 ?0.5 eV.
- *Nuclear isomers " may " be increased or decreased in energy by absorption of photons of the right frequency, or internal transitions with electron potential differences of the right frequency.
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