Scientific Research Publishing

Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=54192#.VPAx-SzQrzE Author(s)    Sean Michael Tanny , Nicholas Niven Sperling , E. Ishmael Parsai * Affiliation(s) Department of Radiation Oncology, Division of Medical Physics, University of Toledo Medical Center, Toledo, Ohio, USA . 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 ...

Read  full  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=54192#.VO7KwCzQrzE Author(s)   Sean Michael Tanny , Nicholas Niven Sperling , E. Ishmael Parsai *   Affiliation(s) Department of Radiation Oncology, Division of Medical Physics, University of Toledo Medical Center, Toledo, Ohio, USA . 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 pre...