1. Institute of Bismuth Science & School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, P. R. China
2. Department of Research and Development & Department of Nuclear Medicine, Shanghai Proton and Heavy Ion Center, Fudan University Cancer Hospital, Shanghai 201321, P. R. China
3. Shanghai Key Laboratory of Radiation Oncology (20dz2261000), Shanghai 201321, P. R. China
4. Shanghai Engineering Research Center of Proton and Heavy Ion Radiation Therapy, Shanghai 201321, P. R. China
5. Department of Nuclear Medicine, Fudan University Shanghai Cancer Center, Shanghai 200032, P. R. China