5L.Gonzàlez, E.Vanó, C.A. cordeiro, et al. Preliminary Safety E valuation of A Cyclotron Facility for Positron Emission Tomogra phy Imaging. European Journal of Nuclear Medicine, 1999,26(8):894～899.
6Bhaskar Mukherjee. Optimisation of The Radiation Shielding of Medical Cyclotrons Using A Genetic Algorithm. Safety Division(B550),Australian Nuclear Science and Technology Organisation(ANSTO), PMB 1, Menai, NSW 2234.
