1. 1. Particle Therapy Co-Operative Group—Particle therapy facilities in clinical operation (last update: September, 2020), https://www.ptcog.ch/. Accessed Oct. 31 2020.
2. 2. Firestone, R. B.: Table of Isotopes, 8th ed., John Wiley and Sons, Inc., New York (1996).
3. 3. Matsumura, H., Toyoda, A., Masumoto, K., Yoshida, G., Yagishita, T., Nakabayashi, T., Sasaki, H., Matsumura, K., Yamaya, Y., Miyazaki, Y.: In-situ Determination of Residual Specific Activity in Activated Concrete Walls of a PET-cyclotron Room, J. Phys.: Conf. Series, 1046, 012016 (2018).
4. 4. Matsumura, H., Yoshida, G., Toyoda, A., Masumoto, K., Nakamura, H., Miura, T., Nishikawa, K., Bessho, K., Sasa, K., Moriguchi, T., Nobuhara, F., Nagashima, Y.: Nondestructive High-Sensitivity Measurement Method for Activation Estimation in Accelerator Room Concrete, Radiation Protection, 40, 677-682 (2020).
5. 5. Jermann, M.: Particle Therapy Statistics in 2014, Int. J. Particle Ther., 2, 50-54 (2015).