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Report No.

Measurement of neutron yields from a water phantom bombarded by 290 MeV/u carbon ions

Shigyo, Nobuhiro*; Uozumi, Yusuke*; Uehara, Haruhiko*; Nishizawa, Tomoya*; Hirabayashi, Keiichi*; Satoh, Daiki   ; Sanami, Toshiya*; Koba, Yusuke*; Takada, Masashi*; Matsufuji, Naruhiro*

Heavy ion cancer therapy has been increased by reason of its clinical advantages. During the treatment, the secondary particles such as neutron and $$gamma$$-ray are produced by nuclear reactions of a heavy ion incidence on a nucleus in a patient body. Estimation of the secondary neutrons yields data is essential for assessment of radiation safety on both of workers and public in treatment facilities. Neutron energy spectra from a water phantom simulating the patient body were obtained at GSI only for forward directions. We measured the neutron yields from carbon ion incident on a water phantom in wide angular range from 15$$^{circ}$$ to 90$$^{circ}$$ with the therapeutic ion energy.



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