放射性

• By that time, the radioactive cloud had thinned out to such an extent that it was no longer visible .
  那时，放射性云已稀释到再也看不见的程度了。
• Subsequent discoveries were made by geological mapping and low-level airborne radiometric surveys .
  地质填图和低空放射性航测又继续探明了一批矿点。
• Since the pioneer days of the curies, many more radioactive substances have been discovered .
  自居里夫妇的开创性时代以来，已经发现许多其他放射性物质。
• 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。
• Since radioactive iodine decays rapidly, virtually all radiation ceases within a few weeks .
  由于放射性碘能迅速破坏，因而实际上几星期内放射性就全部结束了。
• The storage of radioactive waste in the subsurface is a possible solution of their ultimate disposal .
  放射性废料的地下贮存是彻底处理它们的一种可行解决办法。
• The closed system of bomb plus water bath has a constant volume and is thermally insulated .
  放射性物质容器弹和水槽组成的封闭体系具有恒定体积，而且是绝热的。
• The radioactive cloud reaches a height of several miles before spreading out abruptly into a mushroom shape .
  放射性云在上升达几英里高度后才猛然散开成蘑菇状。