title: Neutron yield and induced radioactivity: a study of 235-MeV proton and 3-GeV electron accelerators.
abstract: This study evaluated the magnitude of potential neutron yield and induced radioactivity of two new accelerators in Taiwan: a 235-MeV proton cyclotron for radiation therapy and a 3-GeV electron synchrotron serving as the injector for the Taiwan Photon Source. From a nuclear interaction point of view, neutron production from targets bombarded with high-energy particles is intrinsically related to the resulting target activation. Two multi-particle interaction and transport codes, FLUKA and MCNPX, were used in this study. To ensure prediction quality, much effort was devoted to the associated benchmark calculations. Comparisons of the accelerators' results for three target materials (copper, stainless steel and tissue) are presented. Although the proton-induced neutron yields were higher than those induced by electrons, the maximal neutron production rates of both accelerators were comparable according to their respective beam outputs during typical operation. Activation products in the targets of the two accelerators were unexpectedly similar because the primary reaction channels for proton- and electron-induced activation are (p,pn) and (γ,n), respectively. The resulting residual activities and remnant dose rates as a function of time were examined and discussed.
authors: Institute of Nuclear Engineering and Science, National Tsing Hua University, 101 Sec. 2, Kung Fu Road, Hsinchu 300, Taiwan, R.O.C.
authors: Yung-Cheng
authors: YC
authors: Hsu
authors: Institute of Nuclear Engineering and Science, National Tsing Hua University, 101 Sec. 2, Kung Fu Road, Hsinchu 300, Taiwan, R.O.C.
authors: Bo-Lun
authors: BL
authors: Lai
authors: Institute of Nuclear Engineering and Science, National Tsing Hua University, 101 Sec. 2, Kung Fu Road, Hsinchu 300, Taiwan, R.O.C Department of Engineering and System Science, National Tsing Hua University, 101 Sec. 2, Kung Fu Road, Hsinchu 300, Taiwan, R.O.C rjsheu@mx.nthu.edu.tw.
authors: Rong-Jiun
authors: RJ
authors: Sheu
mesh_terms: D000465:Algorithms; D002138:Calibration; D003198:Computer Simulation; D017357:Cyclotrons; D004583:Electrons; D004867:Equipment Design; D009010:Monte Carlo Method; D009502:Neutrons; D010315:Particle Accelerators; D011522:Protons; D011829:Radiation Dosage; D011851:Radioactivity; D011874:Radiometry / Q000379:methods*; D015203:Reproducibility of Results; D017356:Synchrotrons; D013624:Taiwan
chemical_list: D011522:Protons