Determination of water equivalent ratio for some dosimetric materials in proton therapy using MNCPX simulation tool

doi:10.1007/s41365-019-0544-z

Nuclear Science and Techniques ›› 2019, Vol. 30 ›› Issue (2): 31 doi: 10.1007/s41365-019-0544-z

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Determination of water equivalent ratio for some dosimetric materials in proton therapy using MNCPX simulation tool

Reza Bagheri¹ • Alireza Khorrami Moghaddam² • Bakhtiar Azadbakht³ • Mahmoud Reza Akbari⁴ • Seyed Pezhman Shirmardi¹

¹ Radiation Application Research School, Nuclear Science and Technology Research Institute, Tehran, Iran
² Radiology Department, Allied Faculty, Mazandaran University of Medical Sciences (MazUMS), Sari, Mazandaran, Iran
³ Department of Medical Engineering, Borujerd Branch, Islamic Azad University, Borujerd, Iran
⁴ Therapy Level Laboratory, Secondary Standard Dosimetry Laboratory, Karaj, Iran

Received:2017-09-16 Revised:2017-11-13 Accepted:2017-11-16
Contact: Alireza Khorrami Moghaddam E-mail:ar.khorrami@gmail.com

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Reza Bagheri, Alireza Khorrami Moghaddam, Bakhtiar Azadbakht, Mahmoud Reza Akbari, Seyed Pezhman Shirmardi. Determination of water equivalent ratio for some dosimetric materials in proton therapy using MNCPX simulation tool.Nuclear Science and Techniques, 2019, 30(2): 31 doi: 10.1007/s41365-019-0544-z

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Abstract

Abstract: The water equivalent ratio (WER) was calculated for polypropylene (PP), paraffin, polyethylene (PE), polystyrene (PS), polymethyl methacrylate (PMMA), and polycarbonate materials with potential applications in dosimetry and medical physics. This was performed using the Monte Carlo simulation code, MCNPX, at different proton energies. The calculated WER values were compared with National Institute of Standards and Technology (NIST) data, available experimental and analytical results, as well as the FLUKA, SRIM, and SEICS codes. PP and PMMA were associated with the minimum and maximum WER values, respectively. Good agreement was observed between the MCNPX and NIST data. The biggest difference was 0.71% for PS at 150 MeV proton energy. In addition, a relatively large positive correlation between the WER values and the electron density of the dosimetric materials was observed. Finally, it was noted that PE presented the most analogous Depth Dose Characteristics to liquid water.

Key words: Water equivalent ratio, Proton therapy, Dosimetric materials, MCNPX code

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Determination of water equivalent ratio for some dosimetric materials in proton therapy using MNCPX simulation tool

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