Reactive transport modeling of U and Ra mobility in roll-front uranium deposits: Parameters influencing 226Ra/238U disequilibria

Grozeva, Niya G.; Radwan, J.; Beaucaire, Catherine; Descostes, Michaël

doi:10.1016/j.gexplo.2022.106961

Cited by 7 publications

(2 citation statements)

References 78 publications

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“…The method can be applied to evaluate concentrations of radionuclide in many geothermal fields and excavation sites (Faruwa et al 2020;Cinelli et al 2020). It can also be used to decide the nature and uranium migration (UM) rate in many crustal formations (Youssef et al, 2017;Pereira and Ferreira, 2018;Reis et al 2020) (Yuan 2023), sedimentary surface identification for exploration of oil and gas, radioactive pollution discovery (Cinar et al 2017), mineral probing (Chandrasekaran et al 2014), pure earth science discoveries (Ray 2008;Sims 2021), facture and fissure unearthing linked with uranium concentrations elevation which is caused by uranium movement in fluid in the subsurface (Grozeva 2022) which can cause substantial problem for gamma-ray spectrometry investigation and explanation known as disequilibrium (Lefebvre 2022;Grozeva 2022;Cai 2015).…”

Section: Gamma Ray Spectrometry and Radioactive Series Disequilibriummentioning

confidence: 99%

Modification of Radiogenic Heat Production (RHP) Equation due to Radioactive Disequilibrium in Rock Samples from Gamma-Ray Spectrometry

Alabi,

Sedara,

Ajah

et al. 2023

Preprint

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Many factors complicate the estimation of radiogenic heat production (RHP) which may lead to radionuclide concentrations which does not characterize the RHP being produced by rocks. One of this is the Uranium disequilibrium effect. We modified an existing model to minimize this effect. A revised data from gamma-ray spectrometry was used to compute the Beta and Alpha energies (Eβmax) of decay schemes, mass defect (EΔm)of radioelements, total absorbed energy (Eabs) per atom, numerical constants (Ai) and converted to the accepted RHP unit (µWm-3). The modified RHP model (A3) was evaluated and validated using error metrics and radiometric data from seven regions of Nigeria and India. The data was normalized to transform features to be on a similar scale to attain a normal distribution of the data. The modified model (A3) was compared with Birch’s (A1) and Rybach’s (A2) RHP models. All these processes were implemented in Python environment. The RHP constants is several percent higher (6.2% for U; 11.5% for Th) than the values of A1 and A2 RHP models except for Potassium which is higher (74.3%). The A3 RHP model gotten is: A(µWm-3) = ρ(0.103CU + 0.29CTh + 0.061CK). The contributing percentages of the radioelements were in the order of 40K > 238U > 232Th for the Southwest, Southeast and Northcentral regions of Nigeria while the order is 238U > 232Th > 40K for the Southsouth, Northeast and Northwest regions and in order 232Th > 238U > 40K for the Indian region. The A3 model returned a higher R2 value and lower SSE/RMSE/MAE values compared to A1 and A2 models. The R2 values ranged from 42–72% while RMSE ranged from 0.790–1.127. The A3 has the best performance in all metrics for all the regions. The coefficient of determination (R2) for the proportion of variance of the contribution of the radioelements placed K-40 as most dependent variable with a good correlation with the total RHP in the order of use of A1 < A2 < A3. In general A3 return the highest RHP values across all regions. The A3 RHP model gave a higher R2 value and lower RMSE, MAE, SSE values than A1 and A3 RHP models which is an indicator of best performance. The A3 RHP model performed well in all the regions in Nigeria and outside Nigeria. This shows that the A3 RHP model is not geological-formation dependent.

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Section: Gamma Ray Spectrometry and Radioactive Series Disequilibriummentioning

confidence: 99%

Modification of Radiogenic Heat Production (RHP) Equation due to Radioactive Disequilibrium in Rock Samples from Gamma-Ray Spectrometry

Alabi,

Sedara,

Ajah

et al. 2023

Preprint

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“…Introduction 238,235 U-series and 232 Th disequilibria have been used for several decades in the field of geosciences (see reviews made by (Broecker and Peng, 1982;Ivanovich and Harmon, 1992) and references therein). Early decay chain isotopes ( 238,235,234 U, 231 Pa, 234,232,230,228 Th, 226 Ra) are generally used for dating and highlighting geochemical processes (Grozeva et al, 2022;Milena-Pérez et al, 2021;Vigier et al, 2001). For example, the use of end members of the U decay chain, such as 226 Ra (half-life 1600 y) and 210 Pb (half-life 22.2 y), constrains shorter durations of geological events, such as volcanic eruptions or coral growth (Berlo and Turner, 2010;Ghaleb, 2009;Love et al, 2007;Mabit et al, 2014;Moore and Krishnaswami, 1972;Pickler et al, 2012;Rihs et al, 2021;Wang et al, 2019).…”

mentioning

confidence: 99%

Competitive ion-exchange reactions of Pb(II) (Pb2+/PbCl+) and Ra(II) (Ra2+) on smectites: Experiments, modeling, and implication for 226Ra(II)/210Pb(II) disequilibrium in the environment.

et al. 2023

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Establishing a pre-mining baseline of natural radionuclides distribution and radiation hazard for the Bled El-Hadba sedimentary phosphate deposits (North-Eastern Algeria)

Benarous

Algouti

Boumehdi

et al. 2022

Nuclear Engineering and Technology

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Reactive transport modeling of U and Ra mobility in roll-front uranium deposits: Parameters influencing 226Ra/238U disequilibria

Cited by 7 publications

References 78 publications

Modification of Radiogenic Heat Production (RHP) Equation due to Radioactive Disequilibrium in Rock Samples from Gamma-Ray Spectrometry

Modification of Radiogenic Heat Production (RHP) Equation due to Radioactive Disequilibrium in Rock Samples from Gamma-Ray Spectrometry

Competitive ion-exchange reactions of Pb(II) (Pb2+/PbCl+) and Ra(II) (Ra2+) on smectites: Experiments, modeling, and implication for 226Ra(II)/210Pb(II) disequilibrium in the environment.

Establishing a pre-mining baseline of natural radionuclides distribution and radiation hazard for the Bled El-Hadba sedimentary phosphate deposits (North-Eastern Algeria)

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