| metastable | 1. Of uncertain stability; in a condition to pass into another phase when slightly disturbed; e.g., water, when cooled below the freezing point may remain liquid but will at once congeal if a piece of ice is added. 2. Denoting the excited condition of the nucleus of a radionuclide isomer that reaches a lower energy state by the process of isomeric transition decay without changing its atomic number or weight; e.g., 99m99mTc → 9999Tc + g. Origin: meta-+ L. Stabilis, stable (05 Mar 2000) |
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| nuclide | <physics> A species of atom characterised by the constitution of its nucleus, which is specified by the number of protons (Z), number of neutrons (N) and energy content or, alternatively, by the atomic number (Z), mass number (A = N + Z) and atomic mass, to be regarded as a distinct nuclide, an atom must be capable of existing for a measurable time, thus, nuclear isomers are separate nuclides, whereas promptly decaying excited nuclear states and unstable intermediates in nuclear reactions are not. (16 Dec 1997) |
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보험코드 | 성분/함량 | 구분/보험급여 |
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보험코드 | 성분/함량 | 구분/보험급여 |
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