@misc{oai:repo.qst.go.jp:00063972,
 author = {Takada, Masashi and et.al and 高田 真志},
 month = {Aug},
 note = {MON-MAR01-4 #209 - Contributed Talk - Monday 1:00 PM - Pecos I
Neutron exposure Accelerator System for Biological Effect Experiments (NASBEE)
Masashi Takada, Mitsuru Suda, Takuya Hagiwara, Tsuyoshi Hamano
National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba Chiba 263-8555, Japan
Biological studies for neutrons have been performed using the Neutron exposure Accelerator System for Biological Effect Experiments (NASBEE) in National Institute of Radiological Sciences (NIRS), Chiba, Japan. Neutron biological data are necessary for radiation protections around high-energy accelerators, particle therapy and in aircraft. NIRS have focused to obtain the relative biological effects (RBEs) of several cancers of mice and rats. NASBEE provides the neutron beams produced from the d(4 MeV)-Be reactions at 500 micro-A on the target, cooled by flowing water. The neutron energy spectrum is measured from thermal energy up to 9 MeV and has a shoulder around 2 MeV. Two irradiation rooms can be used: one is normal neutron irradiation rooms for cell and physical irradiation and the other is for specific pathogen-free irradiation. We characterized the neutron irradiation field by measuring absorbed doses using neutron ion chambers, microdosimetric lineal energy distribution using low pressure proportional counters, energy spectra and spatial distributions. The neutron dose rates were measured to be 7.62 mGy/hr. The microdosimetric distributions are closely related to the biological effects of radiations and provides neutron RBEs, 3.5. Photon absorbed doses are contaminated to be 18% in the neutron beams. The neutron doses are within +-5% in the 120 mm in diameter. We are making neutron irradiation system to observe local neutron effect of rats (rat lungs)., 21st International Conference on the Application of Accelerators in Research and Industry},
 title = {Neutron Exposure Accelerator System for Biological Effect Experiments (NASBEE)},
 year = {2010}
}