Abstract:
In order to improve the accuracy of AMS measurement for
182Hf/
180Hf, a series of improvement and innovations of measurement technique and method were taken, such as chemical synthesis of
182Hf free samples, technique of monitoring off-axis current simultaneously, testing the stability of accelerator system, performing the alternate measurement, modified deduction method of
182W, testing the measurement method with simulated samples and real rock samples, and testing the reliability of measurement results. The experimental results show that the relative uncertainty is about 12% for the simulated samples to the order of 1×10
-10(
182Hf/
180Hf), which satisfies the requirement of measurements for real rock samples. The reason of big uncertainty with the rock sample mainly lies in the high content of W in the rock sample.
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