title: Shielding experiment of heavy-ion produced neutrons using a tissue-equivalent proportional counter.
abstract: A shielding experiment was performed at the HIMAC (Heavy Ion Medical Accelerator in Chiba), of National Institute of Radiological Sciences (NIRS), to measure neutron dose using a spherical TEPC (tissue-equivalent proportional counter) of 12.55 cm inner diameter. Neutrons are produced from a 5 cm thick stopping length Cu target bombarded by 400 MeV/nucleon C6+ ions and penetrate concrete or iron shields of various thicknesses at 0 degree to the beam direction. From this shielding experiment. y-distribution, mean lineal energy, absorbed dose, dose equivalent and mean-quality factor were obtained behind the shield as a function of shield thickness. The neutron dose attenuation lengths were also obtained as 126 g cm(-2) for concrete and 211 g cm(-2) for iron. The measured results were compared with the calculated results using the MARS Monte Carlo code.
authors.affiliation: Department of Quantum Science and Energy Engineering, Tohoku University, Aramaki, Aoba, Sendai, 980-8579 Japan.
authors.forename: T
authors.initials: T
authors.lastname: Nunomiya
authors.forename: S
authors.initials: S
authors.lastname: Yonai
authors.forename: M
authors.initials: M
authors.lastname: Takada
authors.forename: A
authors.initials: A
authors.lastname: Fukumura
authors.forename: T
authors.initials: T
authors.lastname: Nakamura
mesh_terms: D002138:Calibration; D002247:Carbon Isotopes; D003300:Copper; D020450:Heavy Ions; D007477:Ions; D007501:Iron; D018499:Linear Energy Transfer; D015233:Models, Statistical; D009010:Monte Carlo Method; D009502:Neutrons; D017785:Photons; D011522:Protons; D011835:Radiation Protection; D011874:Radiometry
chemical_list: D002247:Carbon Isotopes; D007477:Ions; D011522:Protons; D003300:Copper; D007501:Iron