Design and manufacture of composite flexible shield for neutron-gamma mixed fields

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Abstract

In this study, a flexible composite shield with a combination of polyethylene, tungsten and boron carbide has been designed and constructed for neutron-gamma mixed fields. For this purpose, theoretical studies were conducted using the multi-purpose MCNPX Code. According to the results of simulation studies, a multi-purpose composite was constructed using a combination of a solid phase of boron carbide particles with tungsten metal powder and a mixture of different types of soft and hard polyethylene in a laboratory at the center of polymer and petrochemical industry in Iran. The 241Am-Be neutron flux attenuation rate and the cesium gamma flux attenuation were measured for the built shield. The results show that in the polyethylene /boron carbide / tungsten (PE / B4C / w) composite with respect to the micrometric dimensions of the reinforcing particles and the high cross-section of interactions of the radioactive beams with these particles, the composite shield with a much lower thickness than the ordinary shields has higher absorption of gamma and neutron beams. This shield containing 30% of tungsten and boron with a thickness of approximately 0.5 cm, absorbs 90% of the Americium-beryllium neutrons and at the thickness of 2 cm absorbs nearly 40% of the gamma rays of the 137Cs source.
 

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[1] V.P. Singh and N.M. Badiger. Gamma ray and neutron shielding properties of some alloy materials. Ann. Nucl. Energy. 64 (2014) 301–310. [2] J.W.N. Frohlich and H.D. Luginsland. The effect of filler–filler and filler–elastomer interaction on rubber reinforcement. Compos. A 36 (2005) 449–460. [3] S. Nambiar, J.T. Yeow. Polymer-composite materials for radiation protection. ACS applied materials & interfaces 4.11 (2012) 5717-5726. [4] B.B. Boonstra. Role of particulate fillers in elastomer reinforcement: a review. Polymer 20 (1979) 691–704. [5] G.M.K. Heinrich and T.A. Vilgis. Reinforcement of elastomers, current opinion in solid state. Mater. Sci. 6 (2002) 195–203. [6] A. Alipour, G. Naderi, G.R. Bakhshandeh, H. Valicm and S. Shokoohi. Elastomer nanocomposites based on NR/EPDM/organoclay: morphology and properties. Int. Polym. Proc. 26 (2011) 48–55. [8] S.E. Gwaily, H.H. Hassan, M.M. Badawy and M. Madani. Study of electrophysical characteristics of lead–natural rubber composites as radiation shields. Polym. Compos. 23 (2002) 1068–1075. [9] S.E. Gwaily, M.M. Badawy, H.H. Hassan and M. Madani. Natural rubber composites as thermal neutron radiation shields: I. B4C/NR composites. Polym. Test. 21 (2002) 129–133. [10] S.D. Kaloshkin, V.V. Tcherdyntsev, M.V. Gorshenkov, V.N. Gulbin and S.A. Kuznetsov. Radiation–protective polymer–matrix nanostructured composites. J. Alloy. Compd. 536 (2012) S522–S526. [11] M.M. Abdel-Aziz, S.E. Gwaily, A.S. Makarious and A. El–Sayed Abdo. Ethylene–propylene diene rubber/low density polyethylene/boron carbide composites as neutron shields. Polym. Degrad. Stab. 50 (1995) 235–240. [12] T. Korkut, A. Karabulut, G. Budak, B. Aygu¨n, O. Gencel and A. Hanc¸erliog˘ulları. Investigation of neutron shielding properties depending on number of boron atoms for colemanite, ulexite and tincal ores by experiments and FLUKA Monte Carlo simulations. Appl. Radiat. Isot. 70 (2012) 341–345. [13] V.P. Singh, N.M. Badiger and J. Kaewkhao. Radiation shielding competence of silicate and borate heavy metal oxide glasses: comparative study. J. Non-Cryst. Solids. 404 (2014) 167–173. [14] P. Gong, M. Ni, H. Chai and F. Chen, X. Ta. Preparation and characteristics of a flexible neutron and γ-ray shielding and radiation-resistant material reinforced by benzophenone. Nuclear Engineering and Technology. 50 (2018) 470–477. [15] M. Salimi, N. Ghal-Eh1 and E. Asadi Amirabadi. Characterization of a new shielding rubber for use in neutron– gamma mixed fields. Nucl. Sci. Tech. 36 (2018) 1–8. [16] J.S. Hendricks, G.W. McKinney, M.L. Fensin, M.R. James, R.C. Johns, J.W. Durkee. MCNPX 2.6. 0 Extensions. New Mexico, US: Los Alamos National Laboratory, LA-UR-08-2216 (2008). [17] Iran Polymer and Petrochemical Institute (IPPI), Rubber Processing and Engineering Department. [18] Sigma-Aldrich Co., Tungsten. [19] Sigma-Aldrich Co., Boron carbide. [20] M.K. Lee, J.K. Lee, J.W. Kim and G.J. Lee. Properties of B4C-PbO-Al(OH)3-epoxy nanocomposite prepared by ultrasonic dispersion approach for high temperature neutron shields. J. Nucl. Mater. 445 (2014) 63–71. [21] S.Y. Fu, X.Q. Feng, B. Lauke and Y.W. Mai. Effects of particle size, particle/matrix interface adhesion and particle loading on mechanical properties of particulate–polymer composites. Composites Part B. 39 (2008) 933–961.

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