In general, EELS can provide elemental data on light elements in materials. However, in most cases, it is not possible to detect He and H elements with EELS technique.
There are still some special cases, in which He elements are detectable with EELS. In these cases, the plasma peak of solid in the TEM specimen does not fully overlap the peak formed by He K edge (25 eV). Helium had been detected as a gas in environment cells or as bubbles in solids, for instance, He element had been detected under certain conditions, e.g., in nanometer-sized He bubbles in irradiated Ni alloys .
 McGibbon, A.J. (1991) The application of PEELS on a STEM to the problem ofinert gas bubbles in solids. In F.J Humphreys, Ed., Proceedings of the Institute of Physics Electron Microscopy and Analysis Group conference, p. 109-1 12. Institute of Physics Conference Series no 1 19, Institute of Physics, Bristol.