AMS Measurement of ³⁶Cl with a Q3D magnetic spectrometer at CIAE

The ratio of ³⁶Cl/Cl can determine the exposure age of surface rocks and monitor the secular equilibrium of ³⁶Cl of sedimentary and igneous rock in groundwater. Due to the uncertainty effects of different chemical separation processes for removing ³⁶S, there is a high degree of uncertainty in ³⁶Cl Accelerator Mass Spectrometry (AMS) measurements if the ratio of ³⁶Cl/Cl is lower than 10-14 A ³⁶Cl AMS higher sensitivity measurement has been set up by using a ΔE-Q3D method at the China Institute of Atomic Energy (CIAE). The performances of ΔE-Q3D method for 36Cl-AMS measurement had been systemically studied. The experimental results show that the ΔE-Q3D method has a higher isobar suppression factor. Taking advantage of direct removing ³⁶S, the sample preparation can be simplified and the uncertainty effects of different chemical separation processes can be reduced in 36Cl AMS measurements.