小型1<sup>4</sup>C加速器质谱仪实验条件研究

赵振池; 覃永富; 李嘉浩; 卢慧金; 陈丽莎; 蓝海会; 李琪; 谢彦岑; 李昭梅; 刘明吉; 魏思雨; 亓明丽; 包轶文; 何明; 姜山; 沈洪涛

doi:10.7538/zpxb.2019.0067

小型1⁴C加速器质谱仪实验条件研究

1.
广西师范大学物理科学与技术学院,广西桂林541004
2.
中国原子能科学研究院,北京102413

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出版历程
- 刊出日期: 2020-09-19

Study on Experimental Conditions of Compact ¹⁴C Accelerator Mass Spectrometer

1.
College of Physics and Technology,Guangxi Normal University, Guilin 541004, China
2.
China Institute of Atomic Energy, Beijing 102413, China

摘要

摘要: 本文基于小型化¹⁴C专用加速器质谱仪（GXNU-AMS）进行了系统介绍及实验条件研究，包括束流引出调试、剥离气体与电荷态的确定、束流传输调试及本底排除调试。该仪器由中国原子能科学研究院与广西师范大学合作研制，在广西师范大学进行安装调试。仪器采用单极静电加速，最大工作电压为230 kV。仪器的测量精度为0.5%，测量灵敏度为¹⁴C/¹²C≈1.0×10^-14（测量本底4万年），可满足生命科学、考古学等领域的测量要求。
- 小型化 /
- ¹⁴C /
- 加速器质谱仪 /
- 精度
Abstract: GXNU-AMS, a compact ¹⁴C accelerator mass spectrometer, jointly developed by the Chinese Institute of Atomic Energy and Guangxi Normal University, and it was installed and commissioned in Guangxi Normal University. Without the traditional mode of SF₆ pressure tank, the terminal of the system was designed as an open insulated high voltage platform, which reduces the construction size of the traditional accelerator to be about 2×2.5 square meters. Helium gas stripping was used to eliminate the interference of molecular ions, and the maximum operating voltage was 230 kV. At present, the measurement accuracy of the instrument is 0.5%, and the measurement sensitivity is ¹⁴C/¹²C≈1.0×10^-14 (measurement background is 40 000 years), which can meet the measurement requirements in the fields of life sciences and archaeology. In this paper, the experimental conditions and reliability of GXNU-AMS were studied. The pre-accelerator voltage and the main accelerator voltage were set to be 30 kV and 200 kV, respectively, the pressure of stripping gas was set to be 5.1×10^-3 Pa, and the charge state ⁺C was chosen after accelerated. The PMC value of the self-made standard sample was consistent with the values of international OXⅡ standard sample. The experiment results showed that the system can be operated with high measurement accuracy and good stability, which layed a good foundation for further research on this facility. This work is helpful for the construction of more compact and lower cost desktop AMS equipment for meeting the growing demand for scientific research and sample measurement.
- compact /
- ¹⁴C /
- accelerator mass spectrometer /
- accuracy

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参考文献(16)

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