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在β谱学的研究中,经常需要薄而均匀的放射源。为此目的,我们设计了一套真空蒸发制源装置,并用它制出了In~(110),Au~(198)和Sm~(153)的放射源。为了说明问题,我们分别用液滴蒸发和真空蒸发法制备了In~(114)的放射源,用双磁镜和双聚焦β谱仪测量了它们的内转换能谱,并对它们的结果进行了比较。可以看到,真空蒸发法制备源的优点是明显的。此外,也给出了双聚焦β谱仪测量的Sm~(153)69.67千电子伏γ射线的K,L_Ⅰ,L_Ⅱ和L_Ⅲ转换电子线以及Au~(198)411.84千电子伏γ射线的K转换电子线。
In the study of beta spectroscopy, it is often necessary to have a thin and uniform source of radiation. For this purpose, we designed a vacuum evaporation source device and used it to make radioactive sources of In ~ (110), Au ~ (198) and Sm ~ (153). To illustrate the problem, we prepared In ~ (114) radioactive sources by droplet evaporation and vacuum evaporation, respectively, and measured their internal conversion energy spectra by double-mirror and bifocal β spectrometer. Their results A It can be seen that the advantages of vacuum evaporation to make the source are obvious. In addition, the K, L_I, L_II and L_III converted electrons of Sm ~ (153) 69.67 KV γ-rays and the K-transition of Au ~ (198) 411.84 keV γ-rays measured by the dual- Electronic wire.