MCNP5 evaluation of photoneutron production from the Alexandria University 15 MV Elekta Precise medical LINAC.

Autor: Abou-Taleb WM; Physics and Chemistry Department, Faculty of Education, Alexandria University, Alexandria, Egypt. Electronic address: aboutalebw@yahoo.com., Hassan MH; Nuclear and Radiation Engineering Department, Alexandria University, Egypt. Electronic address: mohamed.hassan@alexu.edu.eg., El Mallah EA; Physics Department, Faculty of Science, Alexandria University, Alexandria, Egypt. Electronic address: ekramelmallah@hotmail.com., Kotb SM; Physics and Chemistry Department, Faculty of Education, Alexandria University, Alexandria, Egypt. Electronic address: shery_physics@yahoo.com.
Jazyk: angličtina
Zdroj: Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine [Appl Radiat Isot] 2018 May; Vol. 135, pp. 184-191.
DOI: 10.1016/j.apradiso.2018.01.036
Abstrakt: Photoneutron production, and the dose equivalent, in the head assembly of the 15 MV Elekta Precise medical linac; operating in the faculty of Medicine at Alexandria University were estimated with the MCNP5 code. Photoneutron spectra were calculated in air and inside a water phantom to different depths as a function of the radiation field sizes. The maximum neutron fluence is 3.346×10 -9 n/cm 2 -e for a 30×30 cm 2 field size to 2-4 cm-depth in the phantom. The dose equivalent due to fast neutron increases as the field size increases, being a maximum of 0.912 ± 0.05 mSv/Gy at depth between 2 and 4 cm in the water phantom for 40×40 cm 2 field size. Photoneutron fluence and dose equivalent are larger to 100 cm from the isocenter than to 35 cm from the treatment room wall.
(Copyright © 2018 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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