∑HfF5- current monitoring with off-axis Faraday cup in AMS measurement of 182Hf at CIAE

In order to reduce the systematic uncertainties caused by the sequential injection in AMS measurement of 182Hf,a technique for instantaneous monitoring of off-axis ∑HfF5- current was developed in the AMS laboratory at China Institute of Atomic Energy (CIAE).The stability and reliability of this method have been experimentally verified.As a result,the accuracy for AMS measurement of 182Hf was significantly improved.