cleveite การใช้

• Cleve and Abraham Langlet succeeded in isolating helium from cleveite at about the same time.
• It was first detected as an unknown yellow Swedish chemists, Per Teodor Cleve and Nils Abraham Langlet, who found helium emanating from the uranium ore cleveite.
• Cleveite was the first known terrestrial source of helium, which is created over time by alpha decay of the uranium and accumulates trapped ( occluded ) within the mineral.
• In 1895, while working with Cleve in Uppsala, he made the independent discovery of the element helium ( in the same year discovered by William Ramsay ) in the mineral cleveite.
• By dissolving the radioactive ore cleveite in acid, William Ramsay was able to collect a gas trapped within the rock, which had an atomic weight of 4, and the same spectral lines which Lockyer had observed : helium.
• Helium is found in large amounts in minerals of uranium and thorium, including cleveite, pitchblende, carnotite and monazite, because they emit alpha particles ( helium nuclei, He 2 + ) to which electrons immediately combine as soon as the particle is stopped by the rock.