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- radioactive decay period 放射性衰变周期
- The immediate product of the radioactive decay of an element. 继承元素某种元素放射性衰变的直接产物
- To disintegrate or diminish by radioactive decay. 衰变由于放射性衰变而解体或缩小
- Measurement of geologic time,as through isotopic radioactive decay. 地质年代测定是通过放射性同位素衰变来测定的。
- Rutherford first identified the action of probability in radioactive decay. 卢瑟福首先认识到几率在放射性衰变中的作用。
- Any of several radioactive gases that are isotopes of radon and are products of radioactive decay. 射气几种氡的同位素的放射性气体，是放射性物质衰变的产物
- 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
- Rutherford first identified the action of probability in radioactive decay . 卢瑟福首先认识到几率在放射性衰变中的作用。
- Radioactive decay is still a major concern for the people in this area. 放射性衰变仍是这一领域人们的一个主要顾虑。
- However, some of the minerals contain xenon isotopes unlike those usually produced by radioactive decay of uranium. 然而，有些含氙同位素的矿物并非如此，是由铀的放射性衰变产生的。
- The time required for half the nuclei in a sample of a specific isotopic species to undergo radioactive decay. 半衰期放射性样品的原子核经历一半放射性衰变所需要的时间
- The design shall take into account the radioactive decay of the fission and activation products. 核反应堆的设计应考虑到裂变和活化产物的放射性衰变。
- It had been used for practical ends, to identify elements and to unravel radioactive decay chains. 已将其用于实践的目的，去鉴别元素和阐明放射性衰变系。
- GD can be excited by light from 300 nm to 400 nm, and emit 450-500 nm light. The decay period was above 12 hours. 30O~4 50llln紫外光能有效激发玻璃GD，发射450一520lun的蓝光，余辉时间长达12小时.
- Variations from place to place are due to factors such as rainfall, evaporation, biological activity and radioactive decay. 由于受降雨、蒸发、生物活动以及放射性衰变等因素的影响，不同的海区海水盐度也不同。
- This isotope forms by the radioactive decay of potassium 40, which is sequestered in the rocks deep in Titan's core. 氩40是钾40放射性衰变后所产生，而钾40位在泰坦核心深处的岩石内。
- Alpha particles are positively charged helium nuclei obtained from natural radioactive decay. 粒子是从天然放射性蜕变得到的带正电的氦核。
- Chemistry also uses calculus in determining reaction rates and radioactive decay. 化学也使用演算在确定反应速率和放射性衰变。
- Variations from place to place are due to factors such as rainfall,evaporation,biological activity and radioactive decay. 由于受降雨、蒸发、生物活动以及放射性衰变等因素的影响，不同的海区海水盐度也不同。
- From their work emerged the picture of radioactive decay that is still valid-a violently disruptive explosion of a single atom. 根据他们的工作，展现出至今仍然成立的关于放射性衰变的图象--单个原子的强烈的分裂性爆炸。
