isotope

• The large number of radioactive isotopes among the heavy elements fit into three series .
  重元素中的大量放射性同位素分属于三个系列。
• A detailed search for the isotopes of all the elements required a more precise technique .
  仔细寻找所有元素的同位素需要更精密的技术。
• The inferno spewed a deadly plume of radioactive isotopes into the atmosphere .
  这个象炼狱般的地方将一缕致死的放射性同位素喷入大气层。
• The decisive evidence for isotopes came from two quite different experiments in 1913 .
  对同位素的决定性证明来自1913年两个相当不同的实验。
• The radium isotopes are absorbed to an appreciable extent through the human and animal gut .
  镭的同位素通过人和动物的肠子时有很大部分被吸收。
• Extensive research has shown that fractional atomic masses always mean mixture of isotopes .
  进一步的研究揭示出：部分原子质量常是同位素的混合物。
• Today, most cyclotrons are used either for instructional purpose or for isotope production .
  今天大多数回旋加速器是用在教学上，或者用于同位素生产。
• Indirect ionization by neutrons can also result from fission of plutonium or uranium isotopes .
  通过使钚或铀同位素裂变，中于也能产生间接的电离作用。
• The interval is two mass units because these isotopes of the elements differ by two neutrons .
  因为这些元素的同位素相差两个中子，所以其间隔为两个质量单位。
• It is seen that the points representing stable isotopes define a rather narrow stability region .
  可以看到，表示稳定同位素的那些点，构成一个很窄的稳定性区域。