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Radiation Protection Dosimetry Advance Access originally published online on May 16, 2008
Radiation Protection Dosimetry 2008 131(2):167-179; doi:10.1093/rpd/ncn136
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© The Author 2008. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Analytical shielding calculations for a proton therapy facility

Stephen Avery*, Chris Ainsley, Richard Maughan and James McDonough

Hospital of the University of Pennsylvania, 3400 Spruce St., 2 Donner, Philadelphia, PA 19104, USA

* Corresponding author: avery{at}xrt.upenn.edu

Received November 28, 2007, amended November 28, 2007, accepted March 20, 2008

The University of Pennsylvania is building a proton therapy facility in collaboration with Walter Reed Army Medical Center. The proposed facility has four gantry rooms, a fixed beam room and a research room, and will use a cyclotron as the source of protons. In this study, neutron shielding considerations for the proposed proton therapy facility were investigated using analytical techniques and Monte Carlo simulated neutron spectra. Neutron spectra calculations were done using the GEANT4 (v6.2) simulation code for various materials: water, carbon, iron, nickel and tantalum to estimate the neutron production at proton beam energies of 100, 175 and 250 MeV. Dose equivalent calculations were performed using analytical methods at various critical points within the facility, by folding the GEANT4 produced neutron spectra with dose equivalent rate data from the National Council on Radiation Protection and Measurements (NCRP) Report #144.


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