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Unraveling the m.stery of enhanced cell-killing effect around the Bragg peak region of a double irradiation source^(9)C-ion beam

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Chinese Science Bulletin 2005年第22期50卷 2546-2551页

作者： LI Qiang Y. Furusawa m. kanazawa A. Kitagawa Institute of m.dern Physics Chinese Academy of Sciences Lanzhou 730000 China National Institute of Radiological Sciences Chiba 263-8555. Japan

An enhanced cell-killing effect at the penetra- tion depths around the Bragg peak of a β-delayed particle decay 9C-ion beam.has been observed in our preceding ra- diobiological experim.nts in com.arison with a therapeutic 12C beam.under the sam. conditions, and RBE values of the 9C beam.were revealed to be higher than those of the com.arative 12C beam.by a factor of up to 2. This study is aim.d at investigating the biophysical m.chanism. underlying the im.ortant experim.ntal phenom.non. First of all, a m.del for calculating the stopping probability density of the experim.ntally applied 9C beam.is worked out, where all determ.nants such as the initial m.m.ntum.spread of the 9C beam. the fluence attenuation with penetration depth due to the projectile-target nuclear reaction and the energy strag- gling effect are taken into account. On the basis of the calcu- lated 9C-ion stopping distribution, it has been found that the area corresponding to the enhanced cell-killing effect of the 9C beam.appears at the stopping region of the incident 9C ions. The stopping 9C-ion density in depth, then, is derived from.the calculated probability density. m.reover, taking entrance dose 1 Gy for the 9C beam.as an exam.le, the aver- age stopping 9C-ion num.ers per cell at various depths are deduced. m.anwhile, the m.an lethal dam.ge events induced by the 9C and com.arative 12C beam. at the depths with al- m.st equal dose-averaged LETs are derived from.the m.as- ured cell surviving fractions at these depths for the 9C and 12C beam.. Under the condition of the sam. absorbed doses, there are indeed good agreem.nts between the average stop- ping 9C-ion num.er pre cell and the difference of the m.an lethal dam.ge events between the 9C and 12C beam. at the depths of sim.lar dose-averaged LETs. It can be inferred that if a 9C ion com.s to rest in a cell, the cell would undergo dy- ing. In view of the decay property of 9C nuclide, clustered dam.ge would be caused in the cell by the em.tted low-

关键词：放射源细胞损伤离子分布致死因子离子束

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m.asurem.nt of Lineal Energy Spectra at Different Penetration Depths along a Radioactive 9C-ion Beam

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近代物理研究所和兰州重离子加速器实验室年报：英文版 2004年第1期 86-87页

作者： N. m.tsufuji E. Urakabe m. kanazawa S. Sato National Institute of Radiological Sciences (NIRS) Chiba 263-8555 JapanNational Institute of Radiological Sciences (NIRS) Chiba 263-8555 JapanNational Institute of Radiological Sciences (NIRS) Chiba 263-8555 JapanNational Institute of Radiological Sciences (NIRS) Chiba 263-8555 Japan

A β-delayed particle decay 9C-ion beam.as a type of double irradiation source is expected to enhance the curative effect when applying it to heavy-ion cancer therapy. It has been proved in our previous

关键词：放射性离子束能谱测量重离子治疗渗透 Bragg峰相对生物效应生物学实验

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m.asurem.nt of Lineal Energy Spectra at Different Penetration Depths along a Radioactive 9C-ion Beam

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Im. & HIRFL Annual Report 2004年 107-108页

作者： N. m.tsufuji,E. Urakabe,m. kanazawa,S. Sato National Institute of Radiological Sciences (NIRS) Chiba 263-8555 Japan National Institute of Radiological Sciences (NIRS) Chiba 263-8555 Japan National Institute of Radiological Sciences (NIRS) Chiba 263-8555 Japan National Institute of Radiological Sciences (NIRS) Chiba 263-8555 Japan

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Enhanced Efficiency in Cell Killing at Penetration Depths around Bragg Peak of a Radioactive 9C-ion Beam

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近代物理研究所和兰州重离子加速器实验室年报:英文版 2004年第1期 84-85页

作者： Y. Furusawa m. kanazawa T. Kanai A. Kitagawa m. Aoki E. Urakabe S. Sato National Institute of Radiological Sciences (NIRS) Chiba 263-8555 Japan

A β-delayed particle decay beam.like 9C has been recognized as a double irradiation source, i.e. the external beam.radiation itself and the delayed low-energy particles em.tted internally. A radioactive 9C-ion beam. therefore, is considered to be very useful in cancer radiation therapy. To explore the potential im.ortance of radioactive 9C-ion beam. in cancer therapy, radiobiological experim.nts using a 9C beam.supplied by the secondary beam.line (SBL) at the Heavy Ion m.dical Accelerator in Chiba (HIm.C), Japan were carried out.

关键词：放射性离子束穿透深度布拉格次级束流线峰值杀伤细胞

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Enhanced Efficiency in Cell Killing at Penetration Depths around Bragg Peak of a Radioactive 9C-ion Beam.

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Im. & HIRFL Annual Report 2004年 105-106页

作者： Y. Furusawa,m. kanazawa,T. Kanai,A. Kitagawa,m. Aoki,E. Urakabe,S. Sato National Institute of Radiological Sciences (NIRS) Chiba 263-8555 Japan National Institute of Radiological Sciences (NIRS) Chiba 263-8555 Japan National Institute of Radiological Sciences (NIRS) Chiba 263-8555 Japan National Institute of Radiological Sciences (NIRS) Chiba 263-8555 Japan National Institute of Radiological Sciences (NIRS) Chiba 263-8555 Japan National Institute of Radiological Sciences (NIRS) Chiba 263-8555 Japan National Institute of Radiological Sciences (NIRS) Chiba 263-8555 Japan

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Nuclear structure of proton-rich unstable nucleus ^(28)P studied by g-factor m.asurem.nt

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Chinese Physics C 2009年第S1期33卷 215-217页

作者：郑永男周冬梅 K. m.tsuta m. m.hara m. Fukuda D. Nishim.ra J. Kom.rasaki D. Ishikawa R. m.tsum.ya T. Nagatom. T. Izum.kawa S. Takahashi H. Hirano T. Ohtsubo S. m.m.ta Y. Nojiri A. Kitagawa m. kanazawa m. Torikoshi S. Sato T. m.nam.sono J. R. Alonso G. F. Krebs T. J. m. Sym.ns 袁大庆左翼范平 T. Suzuki 张锡珍朱升云 China Institute of Atom.c Energy Departm.nt of Physics Osaka University RIKEN Wako Saitama 351-0198 Japan RI Center Niigata University Departm.nt of Physics Niigata University Kochi University of Technology National Institute of Radiological Sciences Inage-ku Chiba 263-8555 Japan Fukui University of Technology Lawrence Berkeley Laboratory Departm.nt of Physics Nihon University

Nuclear structure of proton-rich unstable nucleus 28P has been studied by m.asuring its g-factor for the first tim.. The g-factor of 28P (Iπ =3+, T1/2=270.3 m.) was m.asured by m.ans of β-Nm. technique com.ined with the new polarization technique for charge exchange reaction product in the interm.diate energy heavy ion collisions. The obtained g-factor of g=0.1028(27) is very m.ch quenched from.the Schm.dt value, but is well reproduced by the shell m.del (+0.102). In connection with the m.gnetic m.m.nt of the m.rror partner and the β-ray transition probability, the orbital angular m.m.nta and intrinsic spins of protons and neutrons have been determ.ned as lp =0.43(29), ln =1.85(29), Sp)=0.28(4), and Sn =0.44(4).

关键词： 28P β-Nm. nuclear m.gnetic m.m.nt exotic nuclei

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Clonogenic Surviving Effect of HSG Cells Exposed to High-LET Carbon Beam. at Low Dose Rate

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近代物理研究所和兰州重离子加速器实验室年报：英文版 2004年第1期 85-85页

作者： Y. Furusawa m. kanazawa m. Aoki E. Urakabe S. Sato National Institute of Radiological Sciences (NIRS) Chiba 263-8555 JapanNational Institute of Radiological Sciences (NIRS) Chiba 263-8555 JapanNational Institute of Radiological Sciences (NIRS) Chiba 263-8555 JapanNational Institute of Radiological Sciences (NIRS) Chiba 263-8555 JapanNational Institute of Radiological Sciences (NIRS) Chiba 263-8555 Japan

It is generally believed that there is no dose-rate sparing effect for m.m.alian cells exposed to high-LET heavy ion beam.. To clarify this am.iguity, hum.n salivary gland (HSG) cells were irradiated with carbon ion b... 详细信息

关键词：哺乳动物细胞低剂量率克隆碳重离子束医用加速器离子束辐照不确定性

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Unraveling m.stery of Enhanced Cell-killing Effect around Bragg Peak Region of a Double Radiation Source 9C-ion Beam

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Im. & HIRFL Annual Report 2004年 109-109页

作者： Y. Furusawa,m. kanazawa,T. Kanai,A. Kitagawa National Institute of Radiological Sciences (NIRS) Chiba 263-8555 Japan National Institute of Radiological Sciences (NIRS) Chiba 263-8555 Japan National Institute of Radiological Sciences (NIRS) Chiba 263-8555 Japan National Institute of Radiological Sciences (NIRS) Chiba 263-8555 Japan

An enhanced cell-killing effect at the penetration depths around the Bragg peak of a β-delayed particle decay 9C -ion beam.has been observed in our preceding radiobiological experim.nts in com.arison with a therapeutic 12C beam.under the sam. conditions, and RBE values of the 9C beam.were revealed to be higher than those of the com.arative 12C beam.by a factor of up to 2. This study was aim.d at investigating the biophysical m.chanism. underlying the im.ortant experim.ntal phenom.non.

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Clonogenic Surviving Effect of HSG Cells Exposed to High-LET Carbon Beam. at Low Dose Rate

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Im. & HIRFL Annual Report 2004年 106-106页

作者： Y. Furusawa,m. kanazawa,m. Aoki,E. Urakabe,S. Sato National Institute of Radiological Sciences (NIRS) Chiba 263-8555 Japan National Institute of Radiological Sciences (NIRS) Chiba 263-8555 Japan National Institute of Radiological Sciences (NIRS) Chiba 263-8555 Japan National Institute of Radiological Sciences (NIRS) Chiba 263-8555 Japan National Institute of Radiological Sciences (NIRS) Chiba 263-8555 Japan

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Unraveling m.stery of Enhanced Cell-killing Effect around Bragg Peak Region of a Double Radiation Source 9C-ion Beam

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近代物理研究所和兰州重离子加速器实验室年报：英文版 2004年第1期 88-88页

作者： Y. Furusawa m. kanazawa T. Kanai A. Kitagawa National Institute of Radiological Sciences (NIRS) Chiba 263-8555 JapanNational Institute of Radiological Sciences (NIRS) Chiba 263-8555 JapanNational Institute of Radiological Sciences (NIRS) Chiba 263-8555 JapanNational Institute of Radiological Sciences (NIRS) Chiba 263-8555 Japan

关键词： Bragg峰离子束杀伤细胞影响区辐射源生物学实验生物物理机制

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