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.