An MCNP-based model for the evaluation of the photoneutron dose in high energy medical electron accelerators |
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| Institution: | 1. Greek Atomic Energy Commission, Aghia Paraskevi, 153 10 Attiki (Greece);2. Institute of Nuclear Technology and Radiation Protection, NCSR «Demokritos, Aghia Parasaskevi, 153 10 Attiki (Greece);3. Department of Medical Physics, Saint Savvas Hospital, 171 Alexandras Ave., 115 22 Athens (Greece);4. Department of Radiology, Areteion Hospital, University of Athens, 76 Vas. Sofias Ave., 115 28 Athens (Greece);1. Clinical and Molecular Osteoporosis Research Unit, Department of Clinical Sciences, Lund University, Malmö, Sweden;2. Department of Orthopaedics, Skane University Hospital, Malmö, Sweden;1. UNED, Madrid, Spain;2. CIEMAT, Madrid, Spain;1. Nuclear Medicine Department, University Hospital of Salamanca, Spain;2. Medical Physics Department, University Hospital of Salamanca, Spain;3. Institute of Biomedical Research of Salamanca, Spain;1. Department of Health Sciences, Faculty of Life Sciences, Kumamoto University, 4-24-1 Kuhonji, Kumamoto, Japan;2. Graduate School of Health Sciences, Kumamoto University, 4-24-1 Kuhonji, Kumamoto, Japan;3. Kumamoto University Hospital, 1-1-1 Honjo, Kumamoto, Japan;4. Saiseikai Kumamoto Hospital, 5-3-1 Chikami, Kumamoto, Japan;5. National Hospital Organization Kyusyu Medical Center, 1-8-1 Jigyohama, Fukuoka, Japan;6. Kumamoto Chuo Hospital, 1-5-1 Tainoshima, Kumamoto, Japan |
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| Abstract: | The development of a computational model for the treatment head of a medical electron accelerator (Elekta/Philips SL-18) by the Monte Carlo code mcnp-4C2 is discussed. The model includes the major components of the accelerator head and a pmma phantom representing the patient body. Calculations were performed for a 14 MeV electron beam impinging on the accelerator target and a 10 cm×10 cm beam area at the isocentre. The model was used in order to predict the neutron ambient dose equivalent at the isocentre level and moreover the neutron absorbed dose distribution within the phantom. Calculations were validated against experimental measurements performed by gold foil activation detectors. The results of this study indicated that the equivalent dose at tissues or organs adjacent to the treatment field due to photoneutrons could be up to 10% of the total peripheral dose, for the specific accelerator characteristics examined. Therefore, photoneutrons should be taken into account when accurate dose calculations are required to sensitive tissues that are adjacent to the therapeutic X-ray beam. The method described can be extended to other accelerators and collimation configurations as well, upon specification of treatment head component dimensions, composition and nominal accelerating potential. |
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