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Shigyo, Nobuhiro*; Uozumi, Yusuke*; Uehara, Haruhiko*; Nishizawa, Tomoya*; Mizuno, Takafumi*; Takamiya, Masanori*; Hashiguchi, Taro*; Satoh, Daiki; Sanami, Toshiya*; Koba, Yusuke*; et al.
Nuclear Data Sheets, 119, p.303 - 306, 2014/05
Times Cited Count：0 Percentile：0.02(Physics, Nuclear)Heavy ion cancer therapy has been increased by reason of its clinical advantages. During the treatment, the secondary particles such as neutron and 
-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. We have measured the neutron yields from carbon ion incidence on carbon, nitrogen and oxygen targets in wide angular range from 15
to 90 with 100- and 290-MeV/u.
Shigyo, Nobuhiro*; Uozumi, Yusuke*; Uehara, Haruhiko*; Nishizawa, Tomoya*; Hirabayashi, Keiichi*; Satoh, Daiki; Sanami, Toshiya*; Koba, Yusuke*; Takada, Masashi*; Matsufuji, Naruhiro*
Progress in Nuclear Science and Technology (Internet), 4, p.709 - 712, 2014/04
Heavy ion cancer therapy has been increased by reason of its clinical advantages. During the treatment, the secondary particles such as neutron and -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 to 90 with the therapeutic ion energy.
Shigyo, Nobuhiro*; Uozumi, Yusuke*; Uehara, Haruhiko*; Nishizawa, Tomoya*; Mizuno, Takafumi*; Satoh, Daiki; Sanami, Toshiya*; Koba, Yusuke*; Takada, Masashi*; Matsufuji, Naruhiro*
JAEA-Conf 2013-002, p.137 - 142, 2013/10
Heavy ion cancer therapy has been increased by reason of its clinical advantages. During the treatment, the secondary particles such as neutron and -ray are produced by nuclear reactions of a heavy ion incidence on a nucleus in a patient body. Estimation of double differential cross sections of secondary neutron is important to risk assessment of extra dose to organs in the vicinity of the irradiated tumor. Accurate data in neutron energy around 1 MeV is required because neutron in the energy region has large relative biological effectiveness. Neutron double differential cross sections by inducing 290 MeV/u carbon ion to bio-elements have been obtained experimentally. In order to have knowledge of neutron production by deceleration carbon in a human body, we measured the neutron yields from carbon ion incidence on a carbon target of neutron energy below 1 MeV in wide angular range from 15 to 90 with 100 MeV/u.
Uozumi, Yusuke*; Shigyo, Nobuhiro*; Uehara, Haruhiko*; Nishizawa, Tomoya*; Mizuno, Takafumi*; Satoh, Daiki; Sanami, Toshiya*; Koba, Yusuke*; Takada, Masashi*; Matsufuji, Naruhiro*; et al.
HIMAC-140, p.234 - 235, 2013/08
In the heavy-ion radiotherapy, considerable discussion has been attracted regarding the potential for second cancer induction by secondary neutrons produced from the primary heavy-ion fragmentation. We have started new measurements at 100 MeV/u to investigate the neutron production by heavy ions decelerating in a patient body.
Uozumi, Yusuke*; Shigyo, Nobuhiro*; Kajimoto, Tsuyoshi*; Hirabayashi, Keiichi*; Uehara, Haruhiko*; Nishizawa, Tomoya*; Satoh, Daiki; Sanami, Toshiya*; Koba, Yusuke*; Takada, Masashi*; et al.
HIMAC-138, p.237 - 238, 2012/08
In the heavy-ion radiotherapy, considerable discussion has been attracted regarding the potential for second cancer induction by secondary neutrons produced from the primary heavy-ion fragmentation. It is important to measure energy-angle double-differential cross sections (DDXs) of neutron- and photon-productions in heavy-ion nuclear reactions. Since it is notoriously hard to measure the spectral cross sections of neutrons in an energy range of around 1 MeV where the RBE value reaches at its maximum. In the project by last year, experiments were carried out at the synchrotron HIMAC of NIRS, Japan. The beams were 
C and 
O of 290 MeV/u and bombarded a carbon target. In measurements of neutrons and photons were used liquid scintillator detectors of 5" and 2". We have succeeded to lower the neutron energy threshold down to 0.6 MeV. The present results for neutron productions are in reasonable agreements with PHITS. Since our goal in technical aspects has been fulfilled, measurements will be continued for other reactions.
Shigyo, Nobuhiro*; Uozumi, Yusuke*; Uehara, Haruhiko*; Nishizawa, Tomoya*; Hirabayashi, Keiichi*; Satoh, Daiki; Sanami, Toshiya*; Koba, Yusuke*; Takada, Masashi*; Matsufuji, Naruhiro*
no journal, ,
Heavy ion cancer therapy has been increased by reason of its clinical advantages. During the treatment, the secondary particles such as neutron and -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
to 90 with the therapeutic ion energy.
Shigyo, Nobuhiro*; Nishizawa, Tomoya*; Ishibashi, Kenji*; Iwamoto, Yosuke; Matsuda, Norihiro; Sakamoto, Yukio*; Hagiwara, Masayuki*
no journal, ,
In this study, we measured TTNY of 10 MeV deuteron incidence on a thick tungsten target. The thickness of a tungsten target was 0.15 mm, in which a 10 MeV deuteron completely stopped. The target was put in a vacuum chamber in order to avoid energy loss of deuteron in the air. A 20 mm thick aluminum flange was set downstream of the target at 0 as a beam stopper for other thin target experiments. Two NE213 scintillators with 5.08 cm thickness and 5.08 cm diameter were adopted as neutron detectors. Measurement directions were 0, 15, 30 and 60. Flight paths between the target and detectors were from 2.0 to 5.0 m depending on available area in the room. Calculation results by PHITS with QMD model and TALYS with An-Cai deuteron optical potential are also given. Both calculations reproduce trend of experimental data, however, overestimate at 15, 30 and 60.
Ne beamIwamoto, Yosuke; Matsuda, Norihiro; Sakamoto, Yukio*; Hagiwara, Masayuki*; Sanami, Toshiya*; Shigyo, Nobuhiro*; Nishizawa, Tomoya*
no journal, ,
We describe the measurements of neutron and charged particle production double differential cross sections (DDXs) from 15-
m-thick 
Be and 1-m-thick 
Fe targets bombarded with 13 MeV/nucleon Ne and comparisons between the experimental data and calculation results. The target was installed in a vacuum chamber. For the neutron measurement, the NE213 organic liquid scintillators were placed at a distance of 2.0 m from the target. For charged particle measurements, the telescope detectors composed of three Si strip detectors (SSDs) with different thickness were placed in a vacuum chamber. For neutrons, the calculated results generally overestimated the measured data due to the emission of many neutrons following the decay of excited fragments with high energies. For tritons, calculated results at 30 give good agreement with the experimental data, while that at 90 gives large underestimation.
