Neutron spectrum and doses in a 18 MV LINAC |
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Authors: | Hector Rene Vega-Carrillo Berenice Hernández-Almaraz Victor Martin Hernández-Dávila and Arturo Ortíz-Hernández |
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Institution: | (1) Unidad Academica de Estudios Nucleares de la Universidad Autonoma de Zacatecas, Apdo. Postal 336, 98000 Zacatecas, Zac, Mexico |
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Abstract: | Bonner sphere spectrometer with TLDs pairs has been utilized to measure the neutron spectrum 100 cm from isocenter of a 18
MV LINAC, simultaneously the ambient dose equivalent due to neutrons and photons was measured in the control room area with
neutron and gamma-ray area monitors. Measurements were carried out when the LINAC was delivering a dose of 600 MU at the isocentre
that was located at 5 cm depth of a head phantom. Undesired neutron field in the treatment room produce activation reactions
with nuclei in different materials of LINAC, couch, air, and phantom. To determine the dose due to decay of activation nuclei
the ambient dose due to gamma-rays was measured inside the treatment room immediately after dose was delivered. Measured spectrum
has two peaks, one between 0.1–1 MeV and other in the thermal region, the ambient dose equivalent in the control room are
3.1 and 0.93 μSv h−1 for photons and neutrons, respectively. In the treatment room the ambient dose equivalent due to photons produced during
decay of activation nuclei varies from 6 to 26.1 μSv h−1. |
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