Study of attenuation in concrete of an accelerator beam at 6 MV
DOI:
https://doi.org/10.32685/2590-7468/invapnuclear.6.2022.660Keywords:
shielding, tenth value layer, megavoltage x rays, Monte Carlo
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Copyright (c) 2022 Servicio Geológico Colombiano
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Abstract
By means of numerical simulation, an attenuation analysis was performed on a beam of a 6 MV accelerator passing through a shielding barrier of variable thickness and built in Portland concrete. The attenuation as a function of the thickness was fit to a curve. The curve was compared to the adjustment mechanisms proposed by IAEA and NCRP. With these results, the conservative nature of these mechanisms emerged. The differences found in the shielding thickness reach values of up to more than 20 cm, suggesting the need to improve the values currently used to carry out the calculations of the shielding. It can be concluded that the construction costs could be reduced without sacrificing confidence in the barriers by improving the accuracy of such calculations.
References
International Atomic Energy Agency, “Radiation protection in the design of radiotherapy facilities”, Safety Reports Series n.° 47, Viena, 2006. https://www.iaea.org/publications/7197/radiation-protection-in-the-design-of-radiotherapy-facilities
National Council on Radiation Protection y Measurements, “Structural shielding design and evaluation for megavoltage X and gamma-ray radiotherapy facilities: Recommendations of the National Council on Radiation Protection and Measurements. NCRP report n.° 151”, Bethesda, MD, 2005. https://ncrponline.org/shop/reports/report-no-151-structural-shielding-design-and-evaluation-for-megavoltage-x-and-gamma-ray-radiotherapy-facilities-2005/
Agencia Europea para la Seguridad y la Salud en el Trabajo (EU-OSHA), “Directive 2013/59 Euratom Protection against ionising radiation”, Bilbao, 2019. https://osha.europa.eu/es/legislation/directives/directive-2013-59-euratom-protection-against-ionising-radiation
International Commision on Radiological Protection (ICRP), “Recommendations of the international Commission on Radiological Protection”, Ontario, 2005.
International Atomic Energy Agency (IAEA), “IAEA safety standards for protecting people and the environment, radiation protection of the public and the environment, General Safety Guide n.° GSG-8”, Viena, 2018. https://www-pub.iaea.org/MTCD/publications/PDF/PUB1781_web.pdf
International Atomic Energy Agency (IAEA), “IAEA safety standards for protecting people and the environment, occupational radiation protection, General Safety Guide n.° GSG-7”, Viena, 2018. https://www-pub.iaea.org/MTCD/publications/PDF/PUB1785_web.pdf
J. E. Turner, Atoms, radiation, and radiation protection, 3.a ed., Nueva York: Wiley, 2007. https://doi.org/10.1002/9783527616978
P. Andreo, D. Burns, A. Nahum et al., Fundamentals of ionizing radiation dosimetry, 1.a ed. Nueva York: Wiley, 2017.
P. Horton y D. Eaton, “Design and shielding of radiotherapy treatment facilities: IPEM Report 75”, 2.a ed., Bristol: IOP Publishing, 2017. https://iopscience.iop.org/book/978-0-7503-1440-4
W. Culberson, S. Taneja, L. J. Bartol et al., “Measurement of the energy spectrum of a 6 MV Linear Accelerator Using Compton Scattering Spectroscopy and Monte Carlo-Generated Corrections”, International Journal of Medical Physics, vol. 9, pp. 186-200, nov. 2020. https://doi.org/10.4236/ijmpcero.2020.94017
NIST, “Composition of Concrete, Portland”. [Internet]. https://physics.nist.gov/cgi-bin/Star/compos.pl?matno=144
A. M. Ardila-Vargas, Física experimental. Colección notas de clase, 2.a ed., Bogotá: Unibiblos, 2007. http://ciencias.bogota.unal.edu.co/fileadmin/Facultad_de_Ciencias/Publicaciones/Imagenes/Portadas_Libros/Fisica/Fisica_experimental_I/FisicaExperimental.pdf
