加速器质谱测量<sup>60</sup>Fe方法的模拟研究

加速器质谱测量⁶⁰Fe方法的模拟研究

摘要: 长寿命的放射性核素⁶⁰Fe在天体物理学等许多研究领域中有重要科学意义。利用高能量的HI-13串列加速器质谱（AMS）系统和高性能的Q3D磁谱仪，初步研究了⁶⁰Fe的测量方法。通过优化测量条件，利用⁵⁸Fe和⁵⁸Ni分别模拟⁶⁰Fe和⁶⁰Ni，获得了仪器压低同量异位素的能力。结果表明，通过ΔE-Q3D系统结合四阳极气体电离室技术，将Ni的干扰压低了10¹¹。化学方法压低Ni的干扰为10⁴。可以预测⁶⁰Fe/Fe的探测灵敏度为10^-15。

Abstract: The long-lived radionuclide ⁶⁰Fe has scientific significance in many research fields, such as astrophysics. A high-energy HI-13 tandem accelerator mass spectrometry (AMS) system and a high-performance Q3D magnetic spectrometer were used to initially study the ⁶⁰Fe measurement method. By optimizing the measurement conditions, using ⁵⁸Fe and ⁵⁸Ni to simulate ⁶⁰Fe and ⁶⁰Ni, the ability of the instrument to depress isobarics was obtained. The results showed that the interference of Ni was reduced by 10¹¹ through the ΔE-Q3D system combined with the four-anode gas ionization chamber technology. The chemical method depresses the interference of Ni by 10⁴. It can be predicted that the detection sensitivity of ⁶⁰Fe/Fe is 10^-15.