Baseline evaluation for natural radioactivity level and radiological hazardous parameters associated with processing of high grade monazite

Afifi, E. M. El; El-Din, Ahmed M. Shahr; Aglan, Refaat F.; Borai, Ε. H.; Abo-Aly, M.M.

doi:10.1016/j.yrtph.2017.07.029

Cited by 21 publications

(6 citation statements)

References 35 publications

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“…Where, ARa is the activity concentration of 226 Ra (Bq/kg) at the equilibrium with its daughters ( 214 Pb and 214 Bi). The safe use of any NORM or TE-NORM materials requires I to be less than unity [28].…”

Section: The Alphaimentioning

confidence: 99%

Evaluating the Radiological Hazards of Contaminated Soil with Natural Radioactive Materials (NORM) Resulting from Produced Water during Oil & Gas Production

Desouky

Morsi

El-Marakby

2021

Arab Journal of Nuclear Sciences and Applications

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Uncontrolled disposal of water extracted during oil and gas production leads to contamination of the surrounding soil with naturally occurring radioactive materials (NORM), resulting in contamination of huge volumes of soil with radium isotopes (226 Ra and 228 Ra). In order to assess the radiological health hazards and excess lifetime cancer risks associated with the contaminated soil, the concentration of the naturally occurring radionuclides 226 Ra, 232 Th and 40 K were determined using gamma ray spectrometry. The mean activity concentrations of 226 Ra, 232 Th and 40 K were found to be 1939.56, 737.86 and198.21Bq kg _1 , respectively. The results of the radiological indices and annual effective dose & cancer risk estimated by RESRAD obtained in this study were all higher than their worldwide mean values. This indicates the danger of discharging the produced water resulting from oil and gas production into evaporation ponds without taking preventive measures that limit soil contamination and thus limiting workers' exposure to natural radioactive materials. There is a need to establish clear national rules and regulations for dealing with natural radioactive materials resulting from various oil and gas fields in order to contribute to the control and management policy of technologically enhanced naturally occurring radioactive materials (TE-NORM) released from this industry.

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Section: The Alphaimentioning

confidence: 99%

Evaluating the Radiological Hazards of Contaminated Soil with Natural Radioactive Materials (NORM) Resulting from Produced Water during Oil & Gas Production

Desouky

Morsi

El-Marakby

2021

Arab Journal of Nuclear Sciences and Applications

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“…The efficiency of procedures designed to produce these materials has increased as a result of the demand for their manufacture. The issue of recovering from old and spent materials is something that must be taken into account in the future in addition to delivering high-tech materials . The source of lanthanide elements is minerals, which consist of mixtures of several elements.…”

Section: Introductionmentioning

confidence: 99%

Selective Separation of Europium from Lanthanum, Cerium, and Iron Using Porous and Functionalized Polymer

Youssef,

Borai,

El-khalafawy

et al. 2024

Ind. Eng. Chem. Res.

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Europium (Eu) ion is one of the most important and valuable lanthanide elements for nuclear and industrial applications. In this respect, the present study was oriented to prepare a new selective porous polymer using an efficient method for controlled synthesis of block copolymers and polymeric porous particles. Reversible-addition−fragmentation chain transfer (RAFT) emulsion polymerization was performed using poly(styrene-crotonic acid-methacrylic acid) PS(CA-MAA) and trithiocarbonate as a surfactant. The new polymer PS(CA-MAA) was prepared by grafting the polymerization of polystyrene with reactive monomers using γ-rays. The new polymer was investigated for the separation of Eu(III) from light REEs (LREEs) such as La(III), Ce(III), and some impurities such as Fe(III). Different characterizations of the prepared polymer were carried out. Batch experiments were conducted to determine the effects of pH, contact time, and concentration on the sorption and separation of Eu(III) from other light lanthanides and Fe(III). The obtained results revealed that the prepared polymer is more highly selective for Eu(III) than the other LREEs. Lanthanide sorption processes were well fitted to the monolayer sorption isotherm model, with the maximum sorption capacities of 2.51, 7.75, and 45.45 mg g −1 for La(III), Ce(III), and Eu(III), respectively. Pseudo-second-order kinetic models obey the experimental data, suggesting a chemical sorption reaction via a strong complex formation on the surface of PS(CA-MAA). According to the separation factor, separation of Eu from other investigated lanthanides was successively performed and took the order SF(Eu/La)> SF(Eu/Ce), which encouraged further utilization of the prepared polymer for the column chromatographic separation process.

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“…All organisms are consistently subjected to ionizing radiation from naturally occurring radioactive materials (NORM), technically enhanced naturally occurring radioactive materials (TENORM), artificial radionuclides, or nuclear incidents 1 . Several research studies have investigated radiation levels and the distribution of radionuclides in the environment.…”

Section: Introductionmentioning

confidence: 99%

“…Several research studies have investigated radiation levels and the distribution of radionuclides in the environment. These studies play a crucial role in providing essential radiological information 1 – 20 . This knowledge holds excellent importance in comprehending human exposure to radiation occurring from both natural and artificial sources.…”

Section: Introductionmentioning

confidence: 99%

Radiological assessment of different monazite grades after mechanical separation from black sand

kotb,

Abd El Ghany,

El-sayed

2023

Sci Rep

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In Egyptian black sands, monazite is a precious mineral characterized by its composition, which includes crucial constituents such as thorium, trace amounts of uranium, and rare earth elements. It is essential to evaluate and quantify the extent of gamma-ray exposure resulting from the presence of primordial radionuclides. This necessity arises from human activities that extract and retrieve raw materials in uranium and thorium mining operations. The current study focuses on the radiological assessment of Monazite raw material in various grades and calculates the associated hazard indices. A hyper pure Germanium detector (HPGe) determined the particular activity. For grade, 90% Monazite samples, the average activities for 232Th, 238U, and 40K were 348,008 ± 1406, 69,299 ± 2086, and 27,510 ± 245 Bq/kg, respectively. For grade 75% Monazite samples, the average activities were 219,000 ± 901, 55,000 ± 500, and 18,300 ± 86 Bq/kg, while for grade 50% Monazite samples, it was 43,294 ± 1549, 9593 ± 629, and 4000 ± 211 Bq/kg for the same element, respectively. Also, 138La’s inherent radioactivity was taken into account. The computed effective and absorbed dosages exceed the worker’s exempt limit of 20 mSv/y. The calculated hazard parameters are higher than the maximum recommended limits. Therefore, it is imperative to employ radiation safety measures to mitigate the potential hazards of ionizing radiation.

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Baseline evaluation for natural radioactivity level and radiological hazardous parameters associated with processing of high grade monazite

Cited by 21 publications

References 35 publications

Evaluating the Radiological Hazards of Contaminated Soil with Natural Radioactive Materials (NORM) Resulting from Produced Water during Oil & Gas Production

Evaluating the Radiological Hazards of Contaminated Soil with Natural Radioactive Materials (NORM) Resulting from Produced Water during Oil & Gas Production

Selective Separation of Europium from Lanthanum, Cerium, and Iron Using Porous and Functionalized Polymer

Radiological assessment of different monazite grades after mechanical separation from black sand

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