Nuclear Engineering and Technology

  • 제51권6호
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  • Pages.1633-1637
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  • 2019
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  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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Feasibility of clay-shielding material for low-energy photons (Gamma/X)

  • Tajudin, S.M. (Universiti Sultan Zainal Abidin (UniSZA), Faculty of Health Sciences) ;
  • Sabri, A.H.A. (Universiti Sultan Zainal Abidin (UniSZA), Faculty of Health Sciences) ;
  • Abdul Aziz, M.Z. (Oncological and Radiological Science Cluster, Advance Medical and Dental Institute, Universiti Sains Malaysia) ;
  • Olukotun, S.F. (Department of Physics and Engineering Physics, Obafemi Awolowo University) ;
  • Ojo, B.M. (Department of Physics and Engineering Physics, Obafemi Awolowo University) ;
  • Fasasi, M.K. (Centre for Energy Research and Development (CERD), Obafemi Awolowo University)
  • 투고 : 2019.03.07
  • 심사 : 2019.04.25
  • 발행 : 2019.09.25
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초록

While considering the photon attenuation coefficient (${\mu}$) and its related parameters for photons shielding, it is necessary to account for its transmitted and reflected photons energy spectra and dose contribution. Monte Carlo simulation was used to study the efficiency of clay ($1.99g\;cm^{-3}$) as a shielding material below 150 keV photon. Am-241 gamma source and an X-ray of 150 kVp were calculated. The calculated value of ${\mu}$ for Am-241 is higher within 5.61% compared to theoretical value for a single-energy photon. The calculated half-value layer (HVL) is 0.9335 cm, which is lower than that of ordinary concrete for X-ray of 150 kVp. A thickness of 2 cm clay was adequate to attenuate 90% and 85% of the incident photons from Am-241 and X-ray of 150 kVp, respectively. The same thickness of 2 cm could shield the gamma source dose rate of Am-241 (1 MBq) down to $0.0528{\mu}Sv/hr$. For X-ray of 150 kVp, photons below 60 keV were significantly decreased with 2 cm clay and a dose rate reduction by ~80%. The contribution of reflected photons and dose from the clay is negligible for both sources.

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