In the current study the neutron and photon scattering properties of some newly developed high density concretes (HDCs) were calculated by using MCNPX Monte Carlo code. Five high-density concretes including Steel-Magnetite, Barite, Datolite-Galena, Ilmenite-ilmenite, Magnetite-Lead with the densities ranging from 5.11 g/cm3 and ordinary concrete with density of 2.3 g/cm3 were studied in our simulations. The photon beam spectra of 4 and 18 MV from Varian linac and neutron spectra of clinical 18 MeV photon beam was used for calculations. The fluence of scattered photon and neutron from all studied concretes was calculated in different angles. Overall, the ordinary concrete showed higher scattered photons and Datolite-Galena concrete (4.42 g/cm3) had the lowest scattered photons among all studied concretes. For neutron scattering, fluence at the angle of 180 was higher relative to other angles while for photons scattering fluence was maximum at 90 degree. The scattering fluence for photons and neutrons was dependent on the angle and composition of concrete. The results showed that the fluence of scattered photons and neutrons changes with the composition of high density concrete. Also, for high density concretes, the variation of scattered fluence with angle was very pronounced for neutrons but it changed slightly for photons. The results can be used for design of radiation therapy bunkers.
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 Aghamiri SMR Mortazavi SMJ Mosleh Shirazi MA et al. Production of a novel high strength heavy concrete using tourmaline and galena for neutron and photon radiation shielding. Int J Radiat Res. 2014;12(3):277-282.
 Akkurt I Basyigit C Kilincarslan S Mavi B. The shielding of gamma-rays by concretes produced with barite. Prog Nucl Energy. 2005;46(1):1-11.
 Bashter II: Calculation of radiation attenuation coefficients for shielding concretes. Ann Nucl Energy. 1997;24(7):1389-1401.
 Hadad K Majidi H Sarshough S. Enhanced radiation shielding with galena concrete. Nucl Technol Radiat Prot. 2015;30(1):70-74.
 Mesbahi A Alizadeh G Seyed-Oskoee G Azarpeyvand AA. A new barite-colemanite concrete with lower neutron production in radiation therapy bunkers. Ann Nucl Energy. 2013;51:107-111.
 Mortazavi SMJ Mosleh-Shirazi MA Maheri MR et al Production of an economic high-density concrete for shielding megavoltage radiotherapy rooms and nuclear reactors. Int J Radiat Res. 2007;5(3):143-146.
 Mortazavi SMJ Mosleh-Shirazi MA Roshan-Shomal P et al. High-performance heavy concrete as a multi-purpose shield. Radiat Prot Dosimetry. 2010;142(2-4):120-124.
 Mortazavi SMJ Mosleh-Shirazi MA Baradaran-Ghahfarokhi M et al. Production of a datolite-based heavy concrete for shielding nuclear reactors and megavoltage radiotherapy rooms. Iranian J Radiat Res. 2010;8(1):11-15.
 Singh K Singh S Singh SP et al. Gamma radiation shielding and health physics characteristics of diaspore-flyash concretes. J Radiol Prot 2015;35(2):401-414.
 Un A Demir F. Determination of mass attenuation coefficients effective atomic numbers and effective electron numbers for heavyweight and normal-weight concretes. Appl Radiat Isot. 2013;80:73-77.
 Ghiasi H Mesbahi A. Sensitization of the analytical methods for photoneutron calculations to the wall concrete composition in radiation therapy. Radiat Meas. 2012;47(6):461-464.
 Ghiasi H Mesbahi A. Gantry orientation effect on the neutron and capture gamma ray dose equivalent at the maze entrance door in radiation therapy. Nucl Technol Radiat Prot. 2012;27(1):70-74.
 Ghiasi H Mesbahi A. A new analytical formula for neutron capture gamma dose calculations in double-bend mazes in radiation therapy. Rep Pract Oncol Radiother. 2012;17(4):220-225.
 El-Sayed Abdo A. Calculation of the cross-sections for fast neutrons and gamma-rays in concrete shields. Ann Nucl Energy. 2002;29:1977-1988.
 Facure A Silva AX Rivera JC Falcão RC. Neutron scattering in concrete and wood: Part II - Oblique incidence. Radiat Prot Dosimetry. 2008;128(3):367-374.
 Mesbahi A Azarpeyvand AA Shirazi A. Photoneutron production and backscattering in high density concretes used for radiation therapy shielding. Ann Nucl Energy. 2011;38(12):2752-2756.
 Khaldari R Mesbahi A Kara U. Monte Carlo calculation of shielding properties of newly developed heavy concretes for megavoltage photon beam spectra used in radiation therapy. Iranian J Med Phys. 2016;13(4):250-260.
 Pelowitz DB Durkee JW Elson JS et al. MCNPX 2.7.E Extensions. LA-UR-11-01502. Los Alamos National Laboratory; 2011.
 Waly ESA Bourham MA. Comparative study of different concrete composition as gamma-ray shielding materials. Ann Nucl Energy. 2015;85:306-310.
 Sheikh-Bagheri D Rogers DWO. Monte Carlo calculation of nine megavoltage photon beam spectra using the BEAM code. Med Phys. 2002;29(3):391-402.
 Mesbahi A Azarpeyvand AA Khosravi HR. Does concrete composition affect photoneutron production inside radiation therapy bunkers? Jpn J Radiol. 2012;30(2):162-166.
 Facure A Silva AX Falcão RC Crispim VR. Neutron scattering in concrete and wood. Radiat Prot Dosimetry. 2006;119(1-4):514-517.