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21.
介绍了用于HI-13串列加速器质谱(AMS)测量的182Hf实验室参考标准的研制. 通过180Hf的连续热中子俘获产生182Hf, 用热电离质谱对初始参考标准的同位素比进行了精确测量. 取一定量的初始参考标准, 加入已知量的稳定同位素(180Hf)作为稀释剂, 通过逐级稀释的方法, 最终得到同位素比从10-6—10-10的一系列参考标准. 并对该系列参考标准进行了AMS测量, 结果显示182Hf/180Hf的测量值与标称值呈良好的线性关系, 说明该AMS系统可以准确测量同位素比在10-6—10-10范围内的样品. 相似文献
22.
In order to improve the accuracy of accelerator mass spectrometry (AMS) measurement for 182Hf/180Hf, a series of measurements have been taken in the AMS laboratory at the China Institute of Atomic Energy (CIAE). The major ones include the instantaneous monitoring of 180HfF5- current, testing the stability of transmission, the alternate measurements of an unknown sample and standard, and the origin identification and minimization of background 182W. The experimental details and the improvement in the measurement accuracy, as well as some useful suggestions for better satisfying the requirements of certain practical applications, are presented in this paper. 相似文献