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arXiv 2411.04483physics.ins-detnucl-ex
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加速器质谱仪上低气压GEM基时间投影室的最新结果

Recent results on the low-pressure GEM-based TPC at an Accelerator Mass Spectrometer

A. Bondar, V. Parkhomchuk, A. Petrozhitsky, T. Shakirova, A. Sokolov

AI总结:

针对加速器质谱中硼铍同量异位素分离难题,提出基于低气压GEM-TPC同时测量离子径迹射程与能量的新方法,实验与SRIM模拟表明分离度超过5σ,可服务于新生代地质定年。

摘要:

加速器质谱技术使得测量稀有长寿命同位素成为可能,例如$^{10}$Be、$^{14}$C、$^{26}$Al、$^{36}$Cl、$^{41}$Ca和$^{129}$I。这些同位素的含量可低至总元素含量的10$^{-15}$量级。由布德克核物理研究所(BINP AMS)开发的加速器质谱仪成功测量了$^{14}$C相对于$^{12}$C的浓度。然而,存在将$^{10}$B同量异位素背景与$^{10}$Be分离的问题。铍-10用于对时间尺度从1千年到1千万年的地质对象进行定年。\n为解决这一问题,我们提出了一种新的离子识别技术,该技术基于在带有气体电子倍增器(GEM)读出装置的低气压时间投影室(TPC)中同时测量离子径迹射程和离子能量。我们开发了带有专用薄氮化硅窗的TPC,以实现离子的高效通过。首先,使用α粒子源在50托压力的异丁烷中研究了低气压TPC的特性。\n在这项工作中,我们在BINP AMS设备上搭建了低气压TPC,并成功测量了含有$^{14}$C样品中离子的径迹射程和能量。在下一阶段,我们计划对含有$^{10}$Be的样品进行测量。然而,利用已获得的结果和SRIM模拟,我们已经表明同量异位素硼和铍离子可以被分离超过5个标准差。该技术拟应用于AMS中,用于地质对象的定年,即新生代地质年代学。

英文摘要:

The Accelerator Mass Spectrometry technique makes it possible to measure rare long-lived isotopes such as $^{10}$Be, $^{14}$C, $^{26}$Al, $^{36}$Cl, $^{41}$Ca and $^{129}$I. The content of these isotopes can be at the level of 10$^{-15}$ of the total element content. The Accelerator Mass Spectrometer developed by Budker Institute of Nuclear Physics (BINP AMS) successfully measures the concentration of $^{14}$C relative $^{12}$C. However, there is a problem of separating the $^{10}$B isobaric background from $^{10}$Be. Beryllium-10 is used to date geological objects on a time scale from 1 thousand years to 10 million years. To solve this problem we have proposed a new technique for ion identification based on measuring both ion track ranges and ion energies in a low-pressure Time-Projection Chamber (TPC) with Gas Electron Multiplier (GEM) readout. We have developed the TPC with a dedicated thin silicon nitride window for an efficient passage of ions. To begin with, the characteristic of the low-pressure TPC were studied in isobutane at a pressure of 50 torr using alpha particle sources. In this work, we set up the low-pressure TPC on BINP AMS facility and successfully measured track ranges and energies of ions from samples containing $^{14}$C. At the next stage, we are going to carry out measurements with samples containing $^{10}$Be. However, using the obtained results and SRIM simulation we have already shown that the isobaric boron and beryllium ions can be separated by more than 5 sigma. This technique is proposed to be applied in AMS for dating geological objects, namely for geochronology of Cenozoic era.

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