A new heavy-mineral doped clay brick for gamma-ray protection purposes

• Published in: Applied radiation and isotopes 2021-07, Vol.173, p.109720, Article 109720
• Main Authors: Mahmoud, Karem A., Tashlykov, Oleg L., Mhareb, M.H.A., Almuqrin, Aljawhara H., Alajerami, Y.S.M., Sayyed, M.I.
• Format: Article
• Language: English
• Subjects: Clay bricks; Fabrication; Monte Carlo simulation; Radiation shielding
• ISSN: 0969-8043; 1872-9800
• DOI: 10.1016/j.apradiso.2021.109720

The present work novelty pointed to fabricate new clay bricks doped with heavy minerals to be used in the building materials as a candidate for radiation shielding. The bricks were manufactured as (y)Iron mineral+ (1-y)clay, where y = 0, 0.1, 0.2 and 0.3 fractional weight. The prepared bricks' chemical composition and density were introduced to the MCNP-5 code to assess the prepared bricks' protection capacity. The simulated linear attenuation coefficient (LAC) was confirmed by comparing the simulated results with those calculated by the Phy-X/PSD program. We found that the simulated and calculated LAC were close together. The diff (%) between the MCNP-5 and Phy-X/PSD is in the range ±2% for all the fabricated bricks. The maximum LAC values occurred at 0.015 MeV, varied between 21.540 and 39.553 cm−1 for bricks N0 and N30. The lowest LAC achieved at 15 MeV varied between 0.068 and 0.090 cm−1. Bricks without heavy mineral addition have the lowest LAC values at all energies, ranging from 21.540 cm−1 to 0.068 cm−1, while bricks with 30 wt% heavy minerals have the highest LAC. The half-value layer (HVL) values decreased gradually with increasing the mineral ratio in the fabricated bricks. The thinner brick HVL achieved for the sample N 30 with 30 wt % heavy mineral, growing from 0.017 to 7.675 cm. The effective atomic number (Zeff) was reported, and we found that the minimum Zeff values equal to 14.006, 14.865, 15.705, and 16.394 for bricks N 0, N 10, N 20, N 30, respectively. •Four bricks samples were prepared as a mixture of clay and natural mineral.•The density of the fabricated bricks increased with the mineral ratio.•The Monte Carlo simulation code (MCNP-5) used to evaluate the shielding parameters of the fabricated bricks.•The linear attenuation coefficient enhanced with the iron ratio.