Abstract
Our centre is currently undergoing a major expansion, including the construction of two new linear acceleratorradiotherapy bunkers and the addition of extra shielding to existing bunkers. While shielding material is typically specified by Tenth‐Value Layer (TVL) at the design stage, the concrete supplier will specify the (wet) densities of the concrete constituents, and the concrete testing lab will verify the as‐cast material by its dry (cured) density. Thus, the relationship between the intended TVL and the actual performance of the shielding material might not be entirely clear. In this study, cylindrical samples of the high‐density shielding concrete were taken as each section was poured. The shielding performance of the samples (measured by beam attenuation and TVL) was evaluated for 15 MV and 6 MV X‐ray beams, and for the 1.25 MeV monoenergetic gamma beam from a Cobalt‐60 (Co‐60) source. The samples were also imaged and analyzed using Cobalt‐60 Cone Beam Computed Tomography (CoCBCT). Results indicate no significant change in the TVL of high‐density concrete samples as they cure. The minor fluctuations in shielding properties observed are explained by the heterogeneous structure of the samples as indicated in the CoCBCT images.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
