Equivalent Thicknesses of Lead and Fly ash Geopolymer with Addition of Barium Sulphate in Radiation Protection

Shalbi, Sabri M.; Jaafar, M.S.; Ahmed, Naser M.; Al-jarrah, A.M.; Naji, Abdullah T.; Qaeed, M. A.

doi:10.9790/4861-0901025156

Cited by 1 publication

(2 citation statements)

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“…Concrete structures used for radiation protection made with slag geopolymers require less material and smaller size compared to the other concretes mentioned. The radiation shielding capability of the slag geopolymer should further improve compared to the baseline value obtained from this study if additional aggregates such as boron carbide [6], hematite [7], barite [8], mixture of barite and hematite [9], wolframite [10] or serpentine [11] are incorporated.…”

Section: Discussionmentioning

confidence: 98%

“…), their properties, and their applications. There is also an interest in the potential of geopolymer as well as the effect of waste materials in radiation shielding, but typically focusing on the use of additional radiation absorbent aggregates to the geopolymer matrix [6][7][8]. Similar aggregates as well as other types of aggregates have also been studied for use in conventional and heavy concrete [9][10][11].…”

Section: Introduction mentioning

confidence: 99%

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Gamma Radiation Shielding Properties of Slag and Fly Ash-based Geopolymers

2021

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Industrial waste-based geopolymer cement is a greener alternative to Ordinary Portland Cement (OPC) for radiation shielding with comparable mechanical properties without the production of CO 2 during synthesis. In this paper, the linear attenuation coefficient of slag and fly ash-based geopolymers, unmodified by aggregates, is measured and used to calculate the mass attenuation coefficients, half-value layer (HVL), and tenth-value layer (TVL) of the geopolymers. Narrow Beam Gamma Spectrometry with gamma energy of 0.662 MeV, 1.173 MeV, and 1.332 MeV was used to irradiate a series of slag and fly ash-based geopolymer paste of cylindrical shape with a diameter of 7.5 cm and height of 9.5 cm. Slag geopolymer has linear attenuation coefficient of 0.1642/cm, 0.1237/cm, 0.1150/cm, mass attenuation coefficient of 0.0782 cm 2 /g, 0.0589 cm 2 /g, 0.0548 cm 2 /g, the HVL of 4.222 cm, 5.609 cm, 6.056 cm, and TVL of 14.025 cm, 18.633 cm, 20.118 cm, respectively. Fly ash geopolymer has linear attenuation coefficient of 0.1387/cm, 0.1075/cm, and 0.0964/cm, mass attenuation coefficient of 0.0761 cm 2 /g, 0.0589 cm 2 /g, 0.0529 cm 2 /g, HVL of 4.998 cm, 6.453 cm, 7.202 cm, and TVL of 16.603 cm, 21.437 cm, 23.926 cm, respectively. Test samples made from slag-based geopolymers have a better shielding capability compared to fly ash-based geopolymers due to having higher attenuation coefficients as well as lower HVL and TVL, thus requiring less material to absorb radiation of the same energy level.

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