The Occurrence of in Natural Sources of Helium
Phys. Rev. 74, 1590 – Published 1 December, 1948
DOI: https://doi.org/10.1103/PhysRev.74.1590
Abstract
An investigation of the / abundance ratio in helium extracted from the atmosphere, gas wells and a number of minerals has been made. Wide variations in this ratio are observed indicating that a more comprehensive program would be well worth while. is observed in all sources of helium except radioactive minerals. This suggests the possibility of a primordial source as well as more recent sources for this isotope.