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Does concrete composition affect photoneutron production inside radiation therapy bunkers?

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Abstract

Purpose

Different types of concretes are used for bunker construction for radiation therapy. As neutron production occurs in high-energy photon beams, the purpose of this study was to investigate the effect of different concretes on photoneutron doses at an isocenter and maze entrance door.

Materials and methods

The 18-MV photon beam of a Varian 2100 C/D linear accelerator and a radiation therapy bunker were simulated using the MCNPX Monte Carlo code. Different commercially available concretes were used in photoneutron calculations for the simulated bunker.

Results

Higher neutron doses of the water phantom were seen for barytes and galena concretes, while there was no significant (less than 1%) difference between the neutron dose of the phantom for all other concretes. Also, the neutron fluence at the inner and outer maze entrance varied up to 36% depending on the concretes' atomic compositions.

Conclusion

It can be concluded that application of high-density concretes in order to use limited space or for other purposes may cause higher neutron doses in the maze entrance door and consequently may impose stricter requirements for neutron shielding of maze entrance doors.

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Acknowledgments

The authors would like to thank the research office of Tabriz University of Medical Sciences for supporting the current project.

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Authors and Affiliations

  1. Medical Physics Department, Medical School, Tabriz University of Medical Sciences, Tabriz, Iran

    Asghar Mesbahi

  2. Radiation Therapy Department, Imam Hospital, Tabriz, Iran

    Asghar Mesbahi

  3. Nuclear Engineering Department, Science and Research Branch, Islamic Azad University, Tehran, Iran

    Ali-Asghar Azarpeyvand

  4. National Radiation Protection Department, Tehran, Iran

    Hamid Reza Khosravi

  5. Nuclear Science and Technology Institute, Nuclear Science School, Tehran, Iran

    Hamid Reza Khosravi

Authors
  1. Asghar Mesbahi
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  2. Ali-Asghar Azarpeyvand
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  3. Hamid Reza Khosravi
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Correspondence to Asghar Mesbahi.

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Mesbahi, A., Azarpeyvand, AA. & Khosravi, H.R. Does concrete composition affect photoneutron production inside radiation therapy bunkers?. Jpn J Radiol 30, 162–166 (2012). https://doi.org/10.1007/s11604-011-0030-y

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  • DOI: https://doi.org/10.1007/s11604-011-0030-y

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