Electron energy loss spectroscopy (EELS) was applied to detect and analyze quantitatively helium (He) and tritium (3H) enclosed inside bubbles in irradiated beryllium. Both gases were formed in beryllium under neutron irradiation as a consequence of neutron-induced transmutation reactions. They were detected for the first time as pronounced peaks at 13.0 eV for 3H and 22.4 eV for He in EELS spectra collected from flat hexagonal bubbles. An adhesion of 3H or formation of thin beryllium hydride layers on the internal basal surfaces was observed. The number densities of both gases were estimated using electron scattering cross-section and intensities obtained from EELS spectra. The number density values estimated for various bubbles fluctuate from 4 to 15 at/nm3 for He and from 4 to 10 molecules/nm3 for 3H2. Lower gas number density was measured inside large bubbles. The observed higher density of tritium at inner walls of bubbles seems to confirm very recent ab initio calculations of the interaction of hydrogen isotopes with beryllium surfaces.

中文翻译：

---

首次同时检测铍中气泡中的氦和tri。

电子能量损失谱法（EELS）用于检测和定量分析辐照铍中气泡内部的氦气（He）和tri（3H）。由于中子诱发的trans变反应，两种气体均在中子辐照下在铍中形成。在从平坦六边形气泡收集的EELS光谱中，它们首次被检测为3H的13.0 eV和He的22.4 eV的明显峰。观察到3H的粘附或在内部基面上形成了氢化铍铍薄层。使用电子散射截面和从EELS光谱获得的强度估算两种气体的数量密度。估计的各种气泡的数密度值对于He而言为4至15 at / nm3，对于3H2为4至10分子/ nm3。在大气泡内部测得较低的气体数密度。在气泡内壁上观察到的较高的seems密度似乎证实了氢同位素与铍表面相互作用的从头算。