1. China Institute for Radiation Protection, 102 Xuefu Street, 030006 Taiyuan, China
2. Collaborative Innovation Center of Radiation Medicine, Jiangsu Higher Education Institutions, 215006 Suzhou, China
3. Laboratory of Ion Beam Physics, ETH Zurich, 8093 Zurich, Switzerland
4. State Key Laboratory of Baiyunobo Rare Earth Resources Researches and Comprehensive Utilization, Baotou Research Institute of Rare Earths, 36 Huanghe Street, Baotou, Inner Mongolia 014030, China