Photoneutron Flux Measurement via Neutron Activation Analysis in a Radiotherapy Bunker with an 18 MV Linear Accelerator
In cancer treatment, high energy X-rays are used which are produced by linear accelerators (LINACs). If the energy of these beams is over 8 MeV, photonuclear reactions occur between the bremsstrahlung photons and the metallic parts of the LINAC. As a result of these interactions, neutrons are also p...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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EDP Sciences
2017-01-01
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| Series: | EPJ Web of Conferences |
| Online Access: | https://doi.org/10.1051/epjconf/201715307006 |
| _version_ | 1818583334114033664 |
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| author | Çeçen Yiğit Gülümser Tuğçe Yazgan Çağrı Dapo Haris Üstün Mahmut Boztosun Ismail |
| author_facet | Çeçen Yiğit Gülümser Tuğçe Yazgan Çağrı Dapo Haris Üstün Mahmut Boztosun Ismail |
| author_sort | Çeçen Yiğit |
| collection | DOAJ |
| description | In cancer treatment, high energy X-rays are used which are produced by linear accelerators (LINACs). If the energy of these beams is over 8 MeV, photonuclear reactions occur between the bremsstrahlung photons and the metallic parts of the LINAC. As a result of these interactions, neutrons are also produced as secondary radiation products (γ,n) which are called photoneutrons. The study aims to map the photoneutron flux distribution within the LINAC bunker via neutron activation analysis (NAA) using indium-cadmium foils. Irradiations made at different gantry angles (0°, 90°, 180° and 270°) with a total of 91 positions in the Philips SLI-25 linear accelerator treatment room and location-based distribution of thermal neutron flux was obtained. Gamma spectrum analysis was carried out with high purity germanium (HPGe) detector. Results of the analysis showed that the maximum neutron flux in the room occurred at just above of the LINAC head (1.2x105 neutrons/cm2.s) which is compatible with an americium-beryllium (Am-Be) neutron source. There was a 90% decrease of flux at the walls and at the start of the maze with respect to the maximum neutron flux. And, just in front of the LINAC door, inside the room, neutron flux was measured less than 1% of the maximum. |
| first_indexed | 2024-12-16T08:03:37Z |
| format | Article |
| id | doaj.art-2b7d57fedc774f8eab3db97a34da1aa2 |
| institution | Directory Open Access Journal |
| issn | 2100-014X |
| language | English |
| last_indexed | 2024-12-16T08:03:37Z |
| publishDate | 2017-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | EPJ Web of Conferences |
| spelling | doaj.art-2b7d57fedc774f8eab3db97a34da1aa22022-12-21T22:38:33ZengEDP SciencesEPJ Web of Conferences2100-014X2017-01-011530700610.1051/epjconf/201715307006epjconf_icrs2017_07006Photoneutron Flux Measurement via Neutron Activation Analysis in a Radiotherapy Bunker with an 18 MV Linear AcceleratorÇeçen YiğitGülümser TuğçeYazgan ÇağrıDapo Haris0Üstün Mahmut1Boztosun Ismail2Akdeniz University, Nuclear Sciences Application and Research CenterAkdeniz University, Nuclear Sciences Application and Research CenterAkdeniz University, Nuclear Sciences Application and Research CenterIn cancer treatment, high energy X-rays are used which are produced by linear accelerators (LINACs). If the energy of these beams is over 8 MeV, photonuclear reactions occur between the bremsstrahlung photons and the metallic parts of the LINAC. As a result of these interactions, neutrons are also produced as secondary radiation products (γ,n) which are called photoneutrons. The study aims to map the photoneutron flux distribution within the LINAC bunker via neutron activation analysis (NAA) using indium-cadmium foils. Irradiations made at different gantry angles (0°, 90°, 180° and 270°) with a total of 91 positions in the Philips SLI-25 linear accelerator treatment room and location-based distribution of thermal neutron flux was obtained. Gamma spectrum analysis was carried out with high purity germanium (HPGe) detector. Results of the analysis showed that the maximum neutron flux in the room occurred at just above of the LINAC head (1.2x105 neutrons/cm2.s) which is compatible with an americium-beryllium (Am-Be) neutron source. There was a 90% decrease of flux at the walls and at the start of the maze with respect to the maximum neutron flux. And, just in front of the LINAC door, inside the room, neutron flux was measured less than 1% of the maximum.https://doi.org/10.1051/epjconf/201715307006 |
| spellingShingle | Çeçen Yiğit Gülümser Tuğçe Yazgan Çağrı Dapo Haris Üstün Mahmut Boztosun Ismail Photoneutron Flux Measurement via Neutron Activation Analysis in a Radiotherapy Bunker with an 18 MV Linear Accelerator EPJ Web of Conferences |
| title | Photoneutron Flux Measurement via Neutron Activation Analysis in a Radiotherapy Bunker with an 18 MV Linear Accelerator |
| title_full | Photoneutron Flux Measurement via Neutron Activation Analysis in a Radiotherapy Bunker with an 18 MV Linear Accelerator |
| title_fullStr | Photoneutron Flux Measurement via Neutron Activation Analysis in a Radiotherapy Bunker with an 18 MV Linear Accelerator |
| title_full_unstemmed | Photoneutron Flux Measurement via Neutron Activation Analysis in a Radiotherapy Bunker with an 18 MV Linear Accelerator |
| title_short | Photoneutron Flux Measurement via Neutron Activation Analysis in a Radiotherapy Bunker with an 18 MV Linear Accelerator |
| title_sort | photoneutron flux measurement via neutron activation analysis in a radiotherapy bunker with an 18 mv linear accelerator |
| url | https://doi.org/10.1051/epjconf/201715307006 |
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