Investigation of photoneutron production by Siemens artiste linac: A Monte Carlo Study
| Autor: | Navid Khaledi, Moloud Dabaghi, Farhad Samiei, Dariush Sardari, Xufei Wang, Gholamreza Jahanfarnia, Foad Goli Ahmadabad, Mohsen Kheradmand Saadi |
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| Rok vydání: | 2018 |
| Předmět: |
Radiation
Materials science Equivalent dose Monte Carlo method Photon energy 010403 inorganic & nuclear chemistry 01 natural sciences Fluence Linear particle accelerator Neutron temperature 030218 nuclear medicine & medical imaging 0104 chemical sciences Nuclear physics 03 medical and health sciences 0302 clinical medicine Neutron Skyshine |
| Zdroj: | Radiation Physics and Chemistry. 153:98-103 |
| ISSN: | 0969-806X |
| Popis: | In radiotherapy with electron or photon beams, if the produced photon energy is higher than ~7 MeV, neutrons may be produced through photoneutron interaction, exposing not only the patient but the personnel outside the room, by passing through the walls or skyshine. This exposure to photoneutron induced doses can be detrimental to people's health. In this study, deposited energy and fluences at different points inside and outside the room have been examined by the MCNP code for a Siemens Artiste in a bunker. Different thicknesses of the roof have been investigated for examining the skyshine. In addition, two layouts of room door were compared in term of ambient dose equivalent (ADE) leakage. The deposited energy and fluence distributions were obtained in the head of linac and the bunker. In the main hall of the room the fast neutrons were prevailing, but within the maze and at the corners, the neutron spectrum has been shifted into thermal and epithermal neutrons ( The findings had a good coincidence with literatures, despite the differences in the room size and linacs models. These characteristics make also possible to calculate the deposited energy distribution and particle spectra for other settings. In addition, the optimum roof thickness calculating can lead to economic and practical effectiveness. |
| Databáze: | OpenAIRE |
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