1. State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences (IEECAS) Xi'an China
2. Shaanxi Key Laboratory of Accelerator Mass Spectrometry Technology and Application Xi'an AMS Center of IEECAS Xi'an China
3. University of Chinese Academy of Sciences Beijing China
4. Xi'an Institute for Innovative Earth Environment Research Xi'an China
5. Institute of Global Environmental Change Xi'an Jiaotong University Xi'an China