1. Institute of Nuclear Physics and Chemistry (INPC), China Academy of Engineering Physics (CAEP), Mianyang 621999, P. R. China
2. Key Laboratory of Nuclear Medicine and Molecular Imaging of Sichuan Province, Mianyang 621999, P. R. China
3. West China Hospital of Sichuan University Cleaning and Disinfection Supply Center, Chengdu, Sichuan 610041, P. R. China
4. Collaborative Innovation Center of Radiation Medicine of Jiangsu, Higher Education Institutions, Suzhou 215123, P. R. China
5. Department of Nuclear Medicine, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, P. R. China