New concept for neutron dosimetry in ion beam radiotherapy: Feasibility study
In ion beam radiotherapy (IBRT), the secondary neutrons contribute to whole-body exposure, potentially increasing the risk of radiation-induced cancer. The energy range of neutrons generated in the IBRT treatment room spreads from thermal to a few hundred MeV, with those between 0.1 and a few hundre...
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Published in | Radiation physics and chemistry (Oxford, England : 1993) Vol. 223; p. 112014 |
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Format | Journal Article |
Language | English |
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01.10.2024
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Abstract | In ion beam radiotherapy (IBRT), the secondary neutrons contribute to whole-body exposure, potentially increasing the risk of radiation-induced cancer. The energy range of neutrons generated in the IBRT treatment room spreads from thermal to a few hundred MeV, with those between 0.1 and a few hundred MeV playing a crucial role in the ambient dose equivalent. This study introduces a novel approach for measuring the ambient dose equivalent that focuses on the neutron energy spectrum in the IBRT treatment room. Distinguished by the use of a hydrogen-filled proportional counter and a single moderator, this new method overcomes the weakness of the traditional Bonner Sphere Spectrometer by reducing the complexity and time required for measurements. By deriving the neutron energy spectrum, the neutron ambient dose equivalent can be accurately calculated. Our validation demonstrated that the neutron ambient dose equivalents derived using our method closely agree with the actual values, with discrepancies within 4%, underscoring the feasibility of this innovative approach to neutron dosimetry in the IBRT treatment room.
•A new concept for the experimental determination of neutron H*(10) is proposed.•The H*(10) is determined based on the energy spectrum through a single measurement.•This method overcomes the weakness of the conventional measurement method.•Our validation showed that this method reproduces the actual values well.•These findings affirm the practicality of the method in the IBRT treatment room. |
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AbstractList | In ion beam radiotherapy (IBRT), the secondary neutrons contribute to whole-body exposure, potentially increasing the risk of radiation-induced cancer. The energy range of neutrons generated in the IBRT treatment room spreads from thermal to a few hundred MeV, with those between 0.1 and a few hundred MeV playing a crucial role in the ambient dose equivalent. This study introduces a novel approach for measuring the ambient dose equivalent that focuses on the neutron energy spectrum in the IBRT treatment room. Distinguished by the use of a hydrogen-filled proportional counter and a single moderator, this new method overcomes the weakness of the traditional Bonner Sphere Spectrometer by reducing the complexity and time required for measurements. By deriving the neutron energy spectrum, the neutron ambient dose equivalent can be accurately calculated. Our validation demonstrated that the neutron ambient dose equivalents derived using our method closely agree with the actual values, with discrepancies within 4%, underscoring the feasibility of this innovative approach to neutron dosimetry in the IBRT treatment room.
•A new concept for the experimental determination of neutron H*(10) is proposed.•The H*(10) is determined based on the energy spectrum through a single measurement.•This method overcomes the weakness of the conventional measurement method.•Our validation showed that this method reproduces the actual values well.•These findings affirm the practicality of the method in the IBRT treatment room. |
ArticleNumber | 112014 |
Author | Aoki, Katsumi Yonai, Shunsuke |
Author_xml | – sequence: 1 givenname: Katsumi orcidid: 0009-0007-1918-2253 surname: Aoki fullname: Aoki, Katsumi email: katsumi.aoki@riken.jp – sequence: 2 givenname: Shunsuke surname: Yonai fullname: Yonai, Shunsuke |
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Keywords | Neutron energy spectrum Carbon-ion radiotherapy Secondary neutron Neutron dosimetry Hydrogen-filled proportional counter |
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