| 单词 | 衰变 |
| 释义 | 〔einsteinium〕A synthetic transuranic element first produced by neutron irradiation of uranium in a thermonuclear explosion and now usually produced in the laboratory by irradiating plutonium and other elements. Its longest-lived isotope is Es 254 with a half-life of 276 days. Atomic number 99; melting point 860°C. See table at element 锿：一种人工合成超铀元素，在一次热核子反应的铀中子辐射中首次产生。 现在通常通过在实验室里辐照钚和其它元素而产生，其最不易衰变的同位素是Es254， 它的半衰期为276天，原子序数99；熔点860°C 参见 element〔rutherford〕A unit expressing the rate of decay of radioactive material, equal to one million disintegrations per second.卢瑟福：反应放射性材料衰变率的单位，等于每秒一百万次衰变〔becquerel〕The International System unit of radioactivity, equal to one nuclear decay or other nuclear transformation per second.贝克：辐射能的国际度量衡单位，等于每秒1核衰变或其它核转变〔geochronometry〕Measurement of geologic time, as through isotopic radioactive decay.地质年代测定：通过放射性同位素衰变来测定地质年代〔radiation〕A stream of particles or electromagnetic waves emitted by the atoms and molecules of a radioactive substance as a result of nuclear decay.核衰变产生的微粒或电磁波：放射物的原子或分子由于核衰变放出的一束微粒或电磁波〔unstable〕Decaying with relatively short lifetime. Used of subatomic particles.衰变的：具有相对较短的寿命而衰变，常用于亚原子粒子 |
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