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. 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.