Evaluation of neutron spectra and different fluences inside a radiotherapy room with a modified simple geometry of LINAC head

The photoneutron spectra and ambient dose equivalent were determined in a radiotherapy room with a 15 MV linear accelerator using Monte Carlo simulation. A modified simple geometry of the accelerator’s head was modeled by different simulations. Then, by putting it in a radiotherapy room, the photone...

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Bibliographic Details
Published in:Physica scripta 2022-10, Vol.97 (10), p.105304
Main Authors: As-habi, Mahdieh, Khabaz, Rahim, Khoshbin-khoshnazar, Alireza
Format: Article
Language:English
Subjects:
ambient dose equivalent
LINAC
modified geometry of head
photoneutron spectra
scattered fluence
thermal fluence
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Summary:The photoneutron spectra and ambient dose equivalent were determined in a radiotherapy room with a 15 MV linear accelerator using Monte Carlo simulation. A modified simple geometry of the accelerator’s head was modeled by different simulations. Then, by putting it in a radiotherapy room, the photoneutron spectra at different distances from the isocenter and in the maze were determined. The source term spectrum is due to evaporation, and knock-on neutrons. In the presence of the walls, as the distance from isocenter is increased, evaporation and knock-on neutrons are reduced; however, epithermal and thermal neutrons tend to remain constant. The walls also play an influential role in increasing the photoneutron ambient dose equivalent. Subsequently, by placing this modified accelerator’s head in the radiotherapy room, the coefficients of scattered and thermal fluences were also estimated.
ISSN:0031-8949
1402-4896
DOI:10.1088/1402-4896/ac8ef2