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      • KCI등재

        Feasibility of clay-shielding material for low-energy photons (Gamma/X)

        S.M. Tajudin,A.H.A. Sabri,M.Z. Abdul Aziz,S.F. Olukotun,B.M. Ojo,M.K. Fasasi 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.6

        While considering the photon attenuation coefficient (m) and its related parameters for photonsshielding, it is necessary to account for its transmitted and reflected photons energy spectra and dosecontribution. Monte Carlo simulation was used to study the efficiency of clay (1.99 g cm 3) as a shieldingmaterial below 150 keV photon. Am-241 gamma source and an X-ray of 150 kVp were calculated. Thecalculated value of m for Am-241 is higher within 5.61% compared to theoretical value for a single-energyphoton. The calculated half-value layer (HVL) is 0.9335 cm, which is lower than that of ordinary concretefor X-ray of 150 kVp. A thickness of 2 cm clay was adequate to attenuate 90% and 85% of the incidentphotons from Am-241 and X-ray of 150 kVp, respectively. The same thickness of 2 cm could shield thegamma source dose rate of Am-241 (1 MBq) down to 0.0528 mSv/hr. For X-ray of 150 kVp, photons below60 keV were significantly decreased with 2 cm clay and a dose rate reduction by ~80%. The contributionof reflected photons and dose from the clay is negligible for both sources.

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