The current activities in detecting neutrinos as carriers of information from far out in our Universe prompt us to look back on the research activities a century ago that led to the discovery of these weakly interacting particles. One of the leading researchers was Lise Meitner, who observed electrons with well-defined energy, besides the continuous energy spectrum emitted in β decay. These electron lines are well understood as radiationless nuclear transitions competing with γ-ray emission. It is proposed to name the electrons resulting out of this so-called internal conversion process after Lise Meitner and Charles D. Ellis. The equivalent process within the electronic (atomic) shell is the Auger effect, competing with X-ray emission. In this context, the radioactive decay of UX1 or ²³⁴Th, well studied a century ago by Lise Meitner and Charles Ellis, is re-visited, and the mono-energetic electrons are ascribed entirely to the internal conversion process.

当前检测中微子作为来自遥远宇宙的信息载体的活动促使我们回顾一个世纪前的研究活动，这些活动导致了这些弱相互作用粒子的发现。主要研究人员之一是 Lise Meitner，他观察到具有明确能量的电子，以及 β 衰变中发射的连续能谱。这些电子线被很好地理解为与 γ 射线发射竞争的无辐射核跃迁。建议将这种所谓的内部转换过程产生的电子命名为 Lise Meitner 和 Charles D. Ellis。电子（原子）壳内的等效过程是俄歇效应，与 X 射线发射竞争。^{在此背景下，Lise Meitner 和 Charles Ellis 在一个世纪前对 UX1 或234} Th的放射性衰变进行了深入研究，并将单能电子完全归因于内部转换过程。