Pommé S, García-Toraño E, Marouli M, Crespo M T, Jobbágy V, Van Ammel R, Paepen J, Stroh H
European Commission, Joint Research Centre, Institute for Reference Materials and Measurements, Retieseweg 111, B-2440 Geel, Belgium.
Laboratorio de Metrología de Radiaciones Ionizantes, CIEMAT, Avda. Complutense 22, 28040 Madrid, Spain.
Appl Radiat Isot. 2014 May;87:315-9. doi: 10.1016/j.apradiso.2013.11.075. Epub 2013 Dec 1.
The alpha-particle emission probabilities associated with the three main alpha transitions of (238)U were measured by high-resolution alpha-particle spectrometry. Highly enriched (238)U material was used and its isotopic composition characterised by mass spectrometry. Source production through electrodeposition was optimised to reconcile conflicting demands for good spectral resolution and statistical precision. Measurements were performed at IRMM and CIEMAT for 1-2 years in three different set-ups. A new magnet system was put into use to largely eliminate true coincidence effects with low-energy conversion electrons. Finally the accuracy and precision of the relative emission probabilities for the three transitions - 77.01 (10)%, 22.92 (10)% and 0.068 (10)%, respectively - have been improved significantly.
通过高分辨率α粒子光谱法测量了与（238）U的三个主要α跃迁相关的α粒子发射概率。使用了高浓缩的（238）U材料，并通过质谱法对其同位素组成进行了表征。通过电沉积进行源制备，以优化对良好光谱分辨率和统计精度的相互冲突的要求。在IRMM和CIEMAT使用三种不同的装置进行了1至2年的测量。采用了一种新的磁体系统，以在很大程度上消除与低能转换电子的真符合效应。最后，三个跃迁的相对发射概率的准确度和精密度分别显著提高，分别为77.01（10）%、22.92（10）%和0.068（10）%。
