Alpha ionization damage as a cause of low helium ratios

摘要: The possibility has been investigated that helium atoms escape from the crystal structures of minerals only as these become damaged by intense alpha-particle ionization. zircon and sphene found to be almost zero for cases low alpha bombardment, increases progressively until all is lost in where samples have suffered a bombardment 1016 α/mg. zircons granites are well up range activity this damage will important so it concluded one principal causes high loss granitic rocks concentration radioactive elements consequently into centers which great enough escape.