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Investigation of Scattered Radiation Dose at the Door of a Radiotherapy Vault When the Maze Intersects the Primary Beam

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http://www.scirp.org/journal/PaperInformation.aspx?PaperID=54192#.VO7KwCzQrzE

ABSTRACT
NCRP 151 provides very detailed examples demonstrating the necessary concerns for shielding a conventional radiotherapy vault with a maze where the useful beam is parallel to the maze. However, it provides little guidance on how to properly shield a vault with the maze-wall acting as part of a compound primary barrier. We have modeled a new radiotherapy vault with this configuration and assessed the additional photon shielding burden at the door with MCNP5. MCNP simulations demonstrated an increase in overall photon shielding burden at the door relative to calculations that only consider photon workloads presented in NCRP 151. Two additional components of scattered radiation are considered and methods for calculation are presented.
 
Cite this paper
Tanny, S. , Sperling, N. and Parsai, E. (2015) Investigation of Scattered Radiation Dose at the Door of a Radiotherapy Vault When the Maze Intersects the Primary Beam. Journal of Modern Physics, 6, 141-149. doi: 10.4236/jmp.2015.62019.
 
References
[1]National Council on Radiation Protection and Measurements (2005) Structural Shielding Design and Evaluation for Megavoltage X- and Gamma-Ray Radiotherapy Facilities.
 
[2]Facure, A., Cardoso, S.C., da Rosa, L.A.R. and da Silva, A.X. (2010) Radiation Protection Dosimetry, 138, 251-256.
http://dx.doi.org/10.1093/rpd/ncp245
 
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[4]X-5 Monte Carlo Team (2005) LA-UR-03-1987. Los Alamos National Laboratory, USA.
 
[5]Mohan, R., Chui, C. and Lidosfsky, L. (1985) Medical Physics, 12, 592-597.
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[6]Williams III, R.G., Gesh, C.J. and Pagh, R.T. (2006) Pacific Northwest National Laboratory, 14-18.
 
[7]McGinley, P. (2002) Shielding Techniques for Radiation Oncology Facilities. 2nd Edition, Medical Physics Publishing, Madison.
 
[8]Taylor, P.L., Rodgers, J.E. and Shobe, J. (1999) Medical Physics, 26, 1442-1446.
http://dx.doi.org/10.1118/1.598670
 
[9]Shobe, J., Rodgers, J.E. and Taylor, P.L. (1999) Health Physics, 76, 25-35.
http://dx.doi.org/10.1097/00004032-199901000-00005                                 eww150225lx
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