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在筑波大学的12UD串列加速器上开发了一套改进的129Ⅰ加速器质谱(AMS)测量方法,包括在120°磁铁后安装了一副自行设计制作有静电偏转板,有效改善了对127Ⅰ束流和129Ⅰ计数的测量;采用97MoO2分子导航束稳定加速器端电压,加速器的端电压能稳定在几天内不超过0.1%,结合二次剥离,取得了满意的测量效果。用该方法测得AgI试剂样品的本底水平为7.83×10-13。对129Ⅰ/127Ⅰ比值范围为(4.92~0.28)×10-10的一系列样品的测量不确定度在7%以下,准确度较前有所提高。
An improved 129I accelerator mass spectrometry (AMS) measurement method was developed at the 12UD tandem accelerator at the University of Tsukuba. This included the installation of a self-designed electrostatic deflector on the 120 ° magnet to effectively improve the 127 I beam current and 129I count measurement; 97MoO2 molecular navigation beam to stabilize the end of the accelerator voltage, the accelerator terminal voltage can be stable within a few days does not exceed 0.1%, combined with the second stripping, and achieved satisfactory measurement results. The background level of the AgI reagent sample measured by this method was 7.83 × 10-13. For the series of samples with ratio of 129Ⅰ / 127Ⅰ (4.92-0.28) × 10-10, the uncertainty of measurement is below 7%, and the accuracy is higher than before.