239Pu同位素的小型化AMS高效高灵敏测量方法研究OA
High-Efficiency and High-Sensitivity Measurement Method of 239Pu Isotopes with Miniaturized AMS
超痕量重核素 Pu在核环保、核天体物理、地质研究等领域都有重要的应用.加速器质谱技术(AMS)探测限低,测量灵敏度高,能有效克服同量异位素和分子离子干扰,是测量239Pu、242Pu等 Pu同位素的最适合方法.本研究基于中国原子能科学研究院(CIAE)的 300 kV AMS系统开展 Pu的测量方法研究,主要包括离子源负离子的引出、系统高效传输、本底排除与粒子鉴别技术,最终建立 Pu的高效传输和高灵敏测量方法.结果表明:对标准样品测量结果与标称值符合且具有很好的测量稳定性.
As an ultra-trace heavy nuclides,Pu have important applications in fields such as nuclear environmental protection,nuclear astrophysics,and geological research.Accelerator mass spectrometry(AMS),with its low detection limits,high measurement sensitivity,and effective capability to overcome interferences from isobars and molecular ions,is the most suitable method for measuring Pu isotopes such as 239Pu and 242Pu.This work,based on the 300 kV AMS system at the China Institute of Atomic Energy(CIAE),conducted research on Pu measurement methods.The study primarily included investigations into negative ion extraction from the ion source,high-efficiency system transmission,background exclusion,and particle identification techniques.Ultimately,a high-efficiency transmission and high-sensitivity measurement method for Pu was established.Measurement results of standard samples were consistent with their nominal values and demonstrated excellent stability,with a detection limit of 2×106 atoms(0.8 fg)for 239Pu.
龚杰;何明;王龙;赵庆章;张文慧;胡畔;姚振宇
中核清原环境技术工程有限责任公司,北京 100037中国原子能科学研究院,北京 102413中核清原环境技术工程有限责任公司,北京 100037中国原子能科学研究院,北京 102413中国原子能科学研究院,北京 102413中国原子能科学研究院,北京 102413中核环保有限公司,北京 100045
能源科技
AMS小型化Pu高效率高灵敏
AMSminiaturizationPuhigh efficiencyhigh sensitivity
《同位素》 2026 (3)
239-246,8
国家财政部稳定支持研究项目(WDJC-2019-04)国家自然科学基金项目(11875326)国防基础项目
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