Turkoglu Danyal J, Heather Chen-Mayer H
Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899 USA. He is now with USNC-Tech, Seattle, WA 98199 USA.
Materials Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899 USA.
IEEE Trans Nucl Sci. 2021 Jul;68(7). doi: 10.1109/tns.2021.3080682.
A linear fast neutron beam chopper has been deployed at a prompt gamma activation analysis instrument, enabling in-beam activation analysis of short-lived neutron capture products without the need for sample transfer. This article describes the design and operation of the chopper system and measurement results from test samples containing Se-77 and Yb-175m . The chopper timing was optimized for a specific isotope in each measurement, demonstrating an advantage of the programmable system. The linear response of the total gated counts in the decay phase to the incremented Se and Yb masses demonstrates the suitability of the system for quantitative analysis. Theoretical calculations based on the experimental parameters were in good agreement with the observed results. An example that illustrates the separation of overlapping energy peaks by the use of time-stamped list mode data acquisition is shown in a sample containing Yb-175m and Dy-165 .
一台线性快中子束斩波器已部署在一台瞬发伽马活化分析仪器上，无需样品转移就能对短寿命中子俘获产物进行束内活化分析。本文介绍了斩波器系统的设计与运行以及含有硒 - 77和镱 - 175m的测试样品的测量结果。在每次测量中，针对特定同位素对斩波器定时进行了优化，展示了该可编程系统的优势。衰变阶段总门控计数对硒和镱质量增加的线性响应表明该系统适用于定量分析。基于实验参数的理论计算与观测结果吻合良好。在一个含有镱 - 175m和镝 - 165的样品中展示了一个通过使用带时间戳的列表模式数据采集来分离重叠能量峰的示例。
