放射性

• For underwater bursts at certain depths, the radioactive cloud may not be formed .
  当在水下某一深度爆炸时，放射性云团也许不会形成。
• A radioactive atom could transmute itself into an entirely different kind of atom .
  放射性原子本身能嬗变为性质完全不同的另一种原子。
• The radioactivity of a sample is defined to be the number of disintegrations per unit time .
  样品的放射性定义为每单位时间的蜕变数目。
• At the surface, radioactivity of the conglomerates is locally as high as 30 x background .
  在地表，砾岩的局部地段的放射性高达30倍本底值。
• The transmutation of the elements was no longer the privilege of the radioactive substances alone .
  元素的衍变不再是放射性物质独具的特点。
• The aeroradiometric method suffers like others, in particular conditions of terrain .
  航空放射性方法与其它方法一样，受地形特殊条件的影响。
• 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。
• If high-level radioactive wastes are deposited underground, high temperatures may develop .
  如果把高强度放射性废料埋在地下，就可能产生高温。
• This contributed to the second phase of development of airborne radiometric survey techniques .
  这就开始了航空放射性测量技术发展的第二阶段。
• The burst of development in airborne radiometric survey methods reached a technique standard .
  航空放射性普查方法大规模发展达到了一个技术标准。