title: Propagation characteristics of neutrons leaking from the accelerator facilities.
abstract: In this study spatial and time distribution of neutrons leaking from Hokkaido University 45 MeV Electron Linac facility have measured and compared with the Monte Carlo simulations. The neutron transport processes inside and outside the facility building has been simulated using MCNP. The neutrons have measured by BF3 counters and 3He counters with polyethylene moderators up to the distance of 330 m from the facility. The spatial distribution of ambient dose equivalent converted from the counts has been compared with the simulation. The distribution estimated from the counts by the BF3 counter has been shown fairly good agreement with the calculation. The spatial distribution of counts obtained at the 45 MeV Electron Linac facility has been compared with that obtained at the Fusion Neutronics Source (FNS) facility of JAERI. The difference between the propagation characteristics of neutrons leaking from those facilities has been discussed.
authors.affiliation: Division of Quantum Energy Engineering, Graduate School of Engineering, Hokkaido University, Kita-13, Nishi-8, Kita-Ku, Sapporo, 060-8628, Japan.
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Kitaichi
authors.forename: Sadashi
authors.initials: S
authors.lastname: Sawamura
authors.forename: Masashi
authors.initials: M
authors.lastname: Wakisaka
authors.forename: Junichi H
authors.initials: JH
authors.lastname: Kaneko
authors.forename: Kentaro
authors.initials: K
authors.lastname: Ochiai
authors.forename: Takeo
authors.initials: T
authors.lastname: Nishitani
authors.forename: Teruko
authors.initials: T
authors.lastname: Sawamura
mesh_terms: D000465:Algorithms; D001822:Body Burden; D004784:Environmental Monitoring / Q000295:instrumentation / Q000379:methods; D019544:Equipment Failure Analysis / Q000379:methods; D006801:Humans; D009010:Monte Carlo Method; D009502:Neutrons; D016273:Occupational Exposure / Q000032:analysis*; D010315:Particle Accelerators; D011785:Quality Assurance, Health Care / Q000379:methods; D011829:Radiation Dosage; D011835:Radiation Protection / Q000295:instrumentation / Q000379:methods*; D011874:Radiometry / Q000295:instrumentation / Q000379:methods*; D012062:Relative Biological Effectiveness; D015203:Reproducibility of Results; D018570:Risk Assessment / Q000379:methods*; D012307:Risk Factors; D017751:Safety Management / Q000379:methods; D012680:Sensitivity and Specificity