Evaluation of neutron production in new accelerators for radiotherapy |
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Authors: | SA Martínez R Barquero JM Gómez-Ros AM Lallena C Andrés R Tortosa |
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Institution: | 1. Dpto. de Física, Universidad Pedagógica y Tecnológica de Colombia, Colombia;2. H. Universitario Río Hortega Valladolid. Dpto. Radiología, Univ. Valladolid, Spain;3. CIEMAT, Av. Complutense 22, E-28040 Madrid, Spain;4. Univ. de Granada, Dpto. de Física Atómica Molecular y Nuclear, 18071 Granada, Spain |
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Abstract: | Ambient dose equivalent, H*(10), and personal dose equivalent, Hp(10), were calculated in different points located inside two different treatment rooms. 15-MV Varian and 15-MV Elekta accelerators were used in these studies. The geometry of both accelerators heads and treatment rooms were built up to perform the Monte Carlo simulations. The patient was also simulated using an ICRU phantom. Calculations were done using the MCNPX code. Ambient dose equivalents rates from neutrons range between 1.2 and 419 mSv/h in the Elekta treatment room and between 0.96 and 1140 mSv/h in the Varian treatment room, depending on the location. These values suggest a larger neutron production in the Varian than in the Elekta accelerator. |
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