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基于加速器质谱测量的41Ca植物示踪样品制备方法研究

Preparation of Plant 41Ca Tracer Samples for Accelerator Mass Spectrometry

    摘要
  • 摘要: 基于加速器质谱测量方法研究41Ca植物示踪样品的制备。41Ca是宇宙成因核素，半衰期较长，且对植物的代谢具有重要的作用。加速器质谱应用长寿命核素，检测方法具有灵敏度高、放射性剂量小、精度高、测量区间大、示踪周期长等优点。离子源引出束流是衡量加速器质谱灵敏度的重要参数，而较高束流强度的引出束流可以提高加速器质谱的灵敏度。为了获得较高的束流强度，本工作系统研究了41Ca植物示踪样品的湿法、干法、以及湿法和干法相结合的二次氟化法，以建立41Ca植物示踪样品制备流程，确定最高束流强度引出时的最优化41Ca植物示踪样品制备参数，为41Ca植物示踪样品广泛应用提供实验基础。

     

    Abstract: Calcium plays an important role in the metabolism of plants and animals. In this paper, the preparation method of plant 41Ca for accelerator mass spectrometry (AMS) measurement was developed for the first time in China. AMS, with its advantages of high sensitivity, small dose of radioactivity, high accuracy, large measuring range, and long tracer cycle, can be used to measure cosmogenic nuclide 41Ca, which has long half-life. The intensity of the beam in ion source is an important parameter for the sensitivity of AMS measurement. The high beam current can improve the sensitivity of AMS. The preparation methods of plant samples of 41Ca tracer were systematically studied to obtain high beam current using wet, dry and a combining method with wet and dry re-fluoride. A reliable preparation procedure of plant samples for 41Ca tracer and its optimization parameters were determined by testing beam currents of various samples and lay a foundation for the 41Ca-AMS technology at plant tracer applications.

     

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