Shielding verification and neutron dose evaluation of the Mevion S250 proton therapy unit

Journal of Applied Clinical Medical Physics
Michael PrusatorYong Chen

Abstract

For passive scattering proton therapy systems, neutron contamination is the main concern both from an occupational and patient safety perspective. The Mevion S250 compact proton therapy system is the first of its kind, offering an in-room cyclotron design which prompts more concern for shielding assessment. The purpose of this study was to accomplish an in-depth evaluation of both the shielding design and in-room neutron production at our facility using both Monte Carlo simulation and measurement. We found that the shielding in place at our facility is adequate, with simulated annual neutron ambient dose equivalents at 30 cm outside wall/door perimeter ranging from background to 0.07 mSv and measured dose equivalents ranging from background to 0.06 mSv. The in-room measurements reveal that the H*/D decreases when the distance from isocenter and field size increases. Furthermore, the H*/D generally increases when the angle around isocenter increases. Our results from in-room measurements show consistent trends with our Monte Carlo model of the Mevion system.

References

Aug 4, 2005·Physics in Medicine and Biology·Jerimy C Polf, Wayne D Newhauser
Nov 1, 1946·Radiology·R R WILSON
Dec 5, 2013·Physics in Medicine and Biology·Kuan Ling ChenEric E Klein
Apr 27, 2017·Journal of Applied Clinical Medical Physics·Michael PrusatorYong Chen

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Citations

Dec 24, 2019·The British Journal of Radiology·Roger Antoine Hälg, Uwe Schneider
Aug 21, 2020·Nihon Hoshasen Gijutsu Gakkai zasshi·Tomonori IsobeTakeji Sakae
Jun 26, 2020·International Journal of Particle Therapy·Uwe TittMichael T Gillin

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