Abstract

A new ion identification method for accelerator mass spectrometry on the basis of measuring ion track ranges is proposed. A low pressure time projection chamber (TPC) with charge readout by means of a thick gas electron multiplier (THGEM) was developed for testing this method. Tracks of alpha particles from various radioactive sources were successfully recorded by this TPC. In particular, their track ranges were measured to a high precision of about 2\(\%\). A simulation was performed, and it was shown that track range measurements would permit efficiently separating isobaric boron and beryllium ions (at a level of ten standard deviations). It is expected that this method will be used in the accelerator mass spectrometry facility in Novosibirsk for dating geological objects—in particular, for the geochronology of Cenozoic era.

中文翻译：

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基于低压时间投射腔的离子质谱检测器用于加速器质谱的开发

摘要

提出了一种新的基于加速器质谱的离子识别方法。为了测试该方法，开发了一种低压定时投射室（TPC），该电荷投射室通过厚气体电子倍增器（THGEM）读取电荷。该TPC已成功记录了来自各种放射源的α粒子的轨迹。特别是，它们的跟踪范围的测量精度约为2 \（\％\）。进行了仿真，结果表明，测距范围的测量将可以有效分离等压硼和铍离子（十个标准偏差的水平）。预计该方法将在新西伯利亚的加速器质谱仪中用于对地质物体进行测年，尤其是对新生代的地球年代学。