Improvements in the characterization of actinide targets by low solid-angle counting

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• 作者：David M. Gilliam (1)
  Andrew T. Yue (1) (2)
  
• 关键词：Characterization ; Alpha ; particle assay ; Actinide ; Efficiency ; Alpha ; particle counting
• 刊名：Journal of Radioanalytical and Nuclear Chemistry
• 出版年：2014
• 出版时间：February 2014
• 年：2014
• 卷：299
• 期：2
• 页码：1061-1065
• 全文大小：347 KB
• 作者单位：David M. Gilliam (1)
  Andrew T. Yue (1) (2)
  
  1. Neutron Physics Group, Radiation and Biomolecular Physics Division, National Institute of Standards and Technology, Gaithersburg, MD, 20899-8463, USA
  2. Institute for Research in Electronics and Applied Physics, Energy Research Facility, University of Maryland, Bldg. #223 Paint Branch Drive, College Park, MD, 20742-3511, USA
  
• ISSN：1588-2780

文摘

In a paper presented in the Proceedings of the 19th World Conference of the INTDS, 1998, the results of a blind comparison between groups at NIST and the IRMM showed excellent agreement in characterization of actinide targets by alpha-particle counting with low solid-angle geometry. At that time the most accurate NIST results estimated an uncertainty of 0.03?% for the solid-angle determination. The NIST Neutron Physics Group now has improved the accuracy of its solid-angle determination by about a factor of 4, based on an improved aperture design, improved metrology, and comparisons among independent metrology techniques at NIST. Applications of this improved technology are expected to include improved NIST measurements of the free neutron lifetime and a recalibration of the NIST standard for neutron emission rate, NBS-I.