Sentence Examples


  • Hard on this came the recognition of the fact that freely charged positive and negative ions are always present in the atmosphere, and that a radioactive emanation can be collected.
  • Wilson (36) that a vessel in which freshly fallen rain or snow has been evaporated to dryness shows radioactive properties lasting for a few hours.
  • In 1901 Elster and Geitel found that a radioactive emanation is present in the atmosphere.
  • Mache (62) thinks that the ionization observed in the atmosphere may be wholly accounted for by the radioactive emanation.
  • Helium is relatively abundant in many minerals, all of which are radioactive, and contain uranium or thorium as important constituents.

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