Introduction of the prompt γ-ray neutron activation analysis system at CARR and the first pilot experiment on boron-containing high-temperature alloys

IF 1.6 3区工程技术 Q3 CHEMISTRY, INORGANIC & NUCLEAR

Applied Radiation and Isotopes Pub Date : 2024-08-17 DOI:10.1016/j.apradiso.2024.111476

Chanjuan Tang, Yonggang Yao, Caijin Xiao, Shouzhi Zhao

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Abstract

A prompt γ-ray neutron activation analysis system has recently been developed at China advanced research reactor (CARR), the 60 MW research reactor in China Institute of Atomic Energy (CIAE). The system is set at the cold neutron beam guide with a thermal equivalent neutron flux at the sample position of 1.0×10⁹ n·cm^-2·s^-1 with the power of 30 MW, and it is mainly composed of a neutron beam collimator, a sample chamber, a beam stopper, neutron and γ-ray shieldings and a detection system. The detection system can realize three modes of measurement: single, Compton suppression, and pair modes. The detection efficiency was calibrated up to 11 MeV using a set of radionuclides and the (n, γ) reactions of N and Cl. Boron, one of the most important elements in high-temperature alloy material studies, was analyzed in this work, as the first pilot experiment of the CARR-PGNAA system. The analytical sensitivity of 2000 cps/mg-B was obtained. The results verified the feasibility of the CARR-PGNAA system to measure boron in high-temperature alloys, and laid a foundation for the accurate quantification of boron in the next step.

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在 CARR 引进瞬发 γ 射线中子活化分析系统，并首次对含硼高温合金进行试验性实验。

中国原子能科学研究院（CIAE）最近在其60 MW研究堆--中国先进研究堆（CARR）上开发了一套γ射线中子活化瞬时分析系统。该系统设置在冷中子束导向装置上，样品位置的热等效中子通量为 1.0×109 n-cm-2-s-1，功率为 30 MW，主要由中子束准直器、样品室、束挡板、中子和γ射线屏蔽以及探测系统组成。探测系统可实现三种测量模式：单一模式、康普顿抑制模式和成对模式。利用一组放射性核素以及 N 和 Cl 的（n，γ）反应校准了高达 11 MeV 的探测效率。硼是高温合金材料研究中最重要的元素之一，这项工作作为 CARR-PGNAA 系统的首次试点实验对硼进行了分析。分析灵敏度为 2000 cps/mg-B。结果验证了 CARR-PGNAA 系统测量高温合金中硼元素的可行性，为下一步硼元素的精确定量奠定了基础。

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来源期刊

Applied Radiation and Isotopes 工程技术-核科学技术

CiteScore

3.00

自引率

12.50%

发文量

406

审稿时长

13.5 months

期刊介绍： Applied Radiation and Isotopes provides a high quality medium for the publication of substantial, original and scientific and technological papers on the development and peaceful application of nuclear, radiation and radionuclide techniques in chemistry, physics, biochemistry, biology, medicine, security, engineering and in the earth, planetary and environmental sciences, all including dosimetry. Nuclear techniques are defined in the broadest sense and both experimental and theoretical papers are welcome. They include the development and use of α- and β-particles, X-rays and γ-rays, neutrons and other nuclear particles and radiations from all sources, including radionuclides, synchrotron sources, cyclotrons and reactors and from the natural environment. The journal aims to publish papers with significance to an international audience, containing substantial novelty and scientific impact. The Editors reserve the rights to reject, with or without external review, papers that do not meet these criteria. Papers dealing with radiation processing, i.e., where radiation is used to bring about a biological, chemical or physical change in a material, should be directed to our sister journal Radiation Physics and Chemistry.