Journal of Radioanalytical and Nuclear Chemistry最新文献

{"title":"Physicochemical interactions of radon in air and water: optimization of etching, neutralization, and humidity control for CR-39 detectors","authors":"Abdallah M. A. Dawood,&nbsp;Eric T. Glover,&nbsp;Sultan J. Al-Sufyani,&nbsp;Ahmed Softah,&nbsp;Eunice N. Baafi,&nbsp;Rita Kpordzro,&nbsp;Bernice K. Agyeman","doi":"10.1007/s10967-026-11080-y","DOIUrl":"10.1007/s10967-026-11080-y","url":null,"abstract":"<div><p>CR-39 solid-state nuclear track detectors (SSNTDs) are widely used for radon (²²²Rn) dosimetry, but their detection efficiency is governed by multiple physicochemical factors including etching conditions, neutralization protocols, environmental humidity, and the measurement matrix. This study systematically investigates these parameters using the Radosys RadoMeter 2000 System and RadoBath etching unit. CR-39 detectors pre-exposed to radon were etched in 6.25 M KOH at 70 °C for 4 h, followed by quenching, neutralization in 5% acetic acid or 1% HCl, and rinsing to pH 7. Track morphology was analyzed as a function of alpha energy, relative humidity and measurement medium. Comparative data on alpha particle range and relative track yield were obtained. Stoichiometric neutralization requires understanding of monoprotic/diprotic acid and monobasic/dibasic base dissociation (HCl yields 1 H⁺, H₂SO₄ yields 2 H⁺; NaOH yields 1 OH⁻, Ca(OH)₂ yields 2 OH⁻). Under standard etching conditions, higher energy alpha particles produce larger track diameters, allowing energy discrimination between ²²²Rn (5.59 MeV), ²¹⁸Po (6.00 MeV), and ²¹⁴Po (7.69 MeV). Relative humidity significantly affects pit morphology: low RH produces large, deep pits (score 5); medium RH yields uniform pit sizes (score 5); high RH produces smaller, shallower pits (score 2); condensation results in irregular pits with high scatter (score 2.5). Radon behavior differs dramatically between air and water: alpha range is 3–7 cm in air versus 30–70 μm in bulk water, with relative track yield decreasing from 1.0 (air baseline) to ~ 10⁻²–10⁻³ in bulk water. Proper neutralization is essential to halt etching, remove caustic residues, prevent contamination of the automated reader, and achieve optical clarity for track counting. Humidity corrections may be necessary to avoid systematic underestimation of radon concentration in high-humidity environments. These findings provide a physicochemical framework for optimizing CR-39-based radon dosimetry protocols.</p></div>","PeriodicalId":661,"journal":{"name":"Journal of Radioanalytical and Nuclear Chemistry","volume":"335 9","pages":"5885 - 5892"},"PeriodicalIF":1.7,"publicationDate":"2026-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149023115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ball milled clay–Spirulina composite as a green adsorbent for uranium removal from aqueous solution","authors":"Asmaa. A. Mohammed,&nbsp;Hayat H. El-Agamy,&nbsp;Amal E. Mubark","doi":"10.1007/s10967-026-11061-1","DOIUrl":"10.1007/s10967-026-11061-1","url":null,"abstract":"<div><p>A novel ball-milled clay–Spirulina composite (BM-CSC) was developed as a sustainable adsorbent for U(VI) removal from aqueous solutions. The material was characterized using Fourier Transform Infrared Spectroscopy (FTIR), X-ray diffraction (XRD), Environmental Scanning Electron Microscopy coupled with Energy Dispersive X-ray analysis (ESEM–EDX), and zeta potential measurements. Batch adsorption experiments revealed that maximum uptake (211 mg g⁻¹) was achieved at pH 4.5, 298 K, and 60 min contact time. Adsorption followed the Langmuir isotherm (R2 = 0.995) and pseudo-first-order kinetics, indicating monolayer physisorption. Thermodynamic parameters (ΔG° = − 7.49 to − 1.70 kJ/mol; ΔH° = − 64.99 kJ mol⁻¹) confirmed a spontaneous and exothermic process. The composite demonstrated high selectivity toward U(VI) in the presence of competing ions and excellent reusability, with 98% desorption efficiency using 1 M HCl. These findings highlight BM-CSC as an efficient and eco-friendly material for uranium recovery from aqueous systems.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":661,"journal":{"name":"Journal of Radioanalytical and Nuclear Chemistry","volume":"335 8","pages":"5689 - 5705"},"PeriodicalIF":1.7,"publicationDate":"2026-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148816288","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Phosphorylation enhances the performance and mechanism of U(VI) removal from solution by cobalt magnesium hydroxide","authors":"Yuesong Han,&nbsp;Yishuo Zhang,&nbsp;Jingyi Sun,&nbsp;Kun Li,&nbsp;Xingnong Wu,&nbsp;Xiaoyan Li","doi":"10.1007/s10967-026-11066-w","DOIUrl":"10.1007/s10967-026-11066-w","url":null,"abstract":"<p>To achieve efficient capture of U(VI), novel phosphorylated cobalt-magnesium hydroxide nanosheets (P/CoMg-NC) were developed. The synthesized composite exhibited an exceptional maximum adsorption capacity for U(VI) (299.46 mg g⁻¹) with a removal efficiency of 99.82%, alongside strong resistance to coexisting interfering ions. The superior U(VI) sequestration mechanism is primarily driven by Mg²⁺ ion exchange and strong surface complexation involving the introduced phosphate and inherent hydroxyl groups. Consequently, P/CoMg-NC serves as a robust and highly efficient adsorbent for the remediation of complex uranium-laden wastewater.</p>","PeriodicalId":661,"journal":{"name":"Journal of Radioanalytical and Nuclear Chemistry","volume":"335 8","pages":"5645 - 5657"},"PeriodicalIF":1.7,"publicationDate":"2026-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148816191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Laser decontamination of radioactive surfaces: scoping review","authors":"Marcus Paulo Raele,&nbsp;Frederico Antonio Genezini,&nbsp;Roberto Vicente","doi":"10.1007/s10967-026-10980-3","DOIUrl":"10.1007/s10967-026-10980-3","url":null,"abstract":"<div><p>This review aims to consolidate and critically analyze the current knowledge on laser ablation for the decontamination of radioactive surfaces. By examining 48 manuscripts, including academic papers and technical reports, the study compares different laser regimes, materials, and contaminants in order to identify operational trends, practical guidelines, and limitations of the technique. By synthesizing dispersed experimental results, this work seeks to provide conclusions relevant to process design and to support the development of more efficient laser-based decontamination strategies for radioactive waste management.</p></div>","PeriodicalId":661,"journal":{"name":"Journal of Radioanalytical and Nuclear Chemistry","volume":"335 8","pages":"5021 - 5033"},"PeriodicalIF":1.7,"publicationDate":"2026-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10967-026-10980-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148816322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Radon adsorption performance of regenerated pre-oxidized nitrogen-doped activated carbon","authors":"Siyv Li,&nbsp;Guoqing Liu,&nbsp;Yong Liu,&nbsp;Yourui Jiang,&nbsp;Yupeng Xie,&nbsp;Tao Qiu,&nbsp;Shengyang Feng","doi":"10.1007/s10967-026-11064-y","DOIUrl":"10.1007/s10967-026-11064-y","url":null,"abstract":"<div><p>Radon (Rn) is a widely recognized human carcinogen, and modified activated carbon is one of the most effective adsorbents for radon removal. Regeneration of radon-saturated activated carbon is essential to reduce secondary pollution and improve material utilization. In this study, pre-oxidized nitrogen-doped activated carbon (FeN-AC) was regenerated under water-containing and dry thermal conditions at 400 ℃, yielding four samples: T1V-400, T2V-400, D1V-400, and D2V-400. The radon dynamic adsorption coefficients were measured to evaluate regeneration performance. Results showed that T1V-400, obtained by water-assisted regeneration for 30 min, exhibited the best recovery efficiency, reaching 92.5% of the radon adsorption capacity of fresh FeN-AC, which was 7.0%, 10.0%, and 21.6% higher than that of D1V-400, D2V-400, and T2V-400, respectively. Based on the BET and XPS characterization analysis, the recovery rate of radon adsorption is jointly influenced by the pore structure, the content and ratio of nitrogen and oxygen. Higher nitrogen content, a lower N/O ratio, and a better microporous structure are conducive to increasing the adsorption and recovery rate of radon. Kinetic analysis indicated that the adsorption process of regenerated samples was dominated by physical adsorption and surface adsorption, consistent with the original FeN-AC. This work reveals the synergistic effects of pore structure and surface chemistry on radon adsorption recovery, and provides a feasible water-assisted thermal regeneration method for high-efficiency regeneration of radon-adsorbed modified activated carbon.</p></div>","PeriodicalId":661,"journal":{"name":"Journal of Radioanalytical and Nuclear Chemistry","volume":"335 9","pages":"5833 - 5851"},"PeriodicalIF":1.7,"publicationDate":"2026-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149023057","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Stripping of retained U(VI) and Ce(IV) from contaminated 30% TBP-HDBP-dodecane solvent in the PUREX process using sodium carbonate and hydrazine carbonate solutions","authors":"Guanghui Wang,&nbsp;Chao Tian,&nbsp;Shisi Cheng,&nbsp;Zian Zhai,&nbsp;Mingming Xia","doi":"10.1007/s10967-026-11058-w","DOIUrl":"10.1007/s10967-026-11058-w","url":null,"abstract":"<div><p>Contaminated organic solvents in the PUREX process retain U(VI) and Pu(IV), hindering metal recovery and solvent reuse. This study aimed to evaluate hydrazine carbonate ((N₂H₅)₂CO₃) as a salt-free alternative to sodium carbonate (Na₂CO₃) for stripping U(VI) and Ce(IV), used as a Pu(IV) surrogate, from a 30% TBP-dodecane system containing di-n-butyl phosphate. The effects of phase ratio, reagent concentration, HDBP concentration, metal concentration, and temperature were examined. (N₂H₅)₂CO₃ showed higher removal efficiencies for both ions under identical conditions, with enhanced performance at higher volume ratios and concentrations. These results demonstrate the feasibility of (N₂H₅)₂CO₃ for purifying contaminated organic solvents.</p></div>","PeriodicalId":661,"journal":{"name":"Journal of Radioanalytical and Nuclear Chemistry","volume":"335 8","pages":"5675 - 5687"},"PeriodicalIF":1.7,"publicationDate":"2026-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148816189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimization of a radiochemical-gravimetric workflow for Ni recovery in complex radioactive waste matrices prior to 59Ni and 63Ni determination","authors":"Fábio Vitório Sussa,&nbsp;Tânia de Paula Brambilla Tchobnian,&nbsp;Fernanda Veras de Souza,&nbsp;Roberto Hazenfratz,&nbsp;Bianca Duarte da Costa,&nbsp;Gabriella Souza Cardoso,&nbsp;Cátia Heloisa Rosignoli Saueia,&nbsp;Lucas Stano Junqueira,&nbsp;Horacio Marconi da Silva Matias Dantas Linhares,&nbsp;Beatriz de Brito Souza,&nbsp;Luiz Antonio Araújo Santos,&nbsp;Paulo de Tarso Dalledone Siqueira,&nbsp;Paulo Sergio Cardoso da Silva","doi":"10.1007/s10967-026-11074-w","DOIUrl":"10.1007/s10967-026-11074-w","url":null,"abstract":"<div><p>Radiochemical analysis of radioactive waste containing difficult-to-measure radionuclides such as ⁵⁹Ni and ⁶³Ni requires robust separation and recovery strategies. In this study, a radiochemical-gravimetric workflow for quantitative nickel recovery was systematically optimized using real radioactive waste samples. Critical operational parameters were evaluated to minimize Ni losses and improve recovery. The optimized workflow, based on AG 1-X4 anion exchange resin, Ni Resin packed in in-house prepared glass columns, and polyethersulfone membrane filtration, achieved recoveries of (89 ± 9) % by gravimetry and (88 ± 10) % by ICP-OES. The methods showed no statistically significant difference (<i>p</i> = 0.384) and exhibited a significant positive correlation (r = 0.77), supporting reliable subsequent ⁵⁹Ni and ⁶³Ni determination in complex radioactive waste matrices.</p></div>","PeriodicalId":661,"journal":{"name":"Journal of Radioanalytical and Nuclear Chemistry","volume":"335 9","pages":"5873 - 5883"},"PeriodicalIF":1.7,"publicationDate":"2026-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10967-026-11074-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149023114","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dual role of bicarbonate in uranium leaching under neutral CO2+O2 conditions: mechanism and kinetic evolution","authors":"Yupeng Zhai,&nbsp;Gongxin Chen,&nbsp;Haonan Li,&nbsp;Zhilong Ruan,&nbsp;Jinhui Liu,&nbsp;Liming Chen,&nbsp;Mengyang Han,&nbsp;Xing Xiang","doi":"10.1007/s10967-026-11070-0","DOIUrl":"10.1007/s10967-026-11070-0","url":null,"abstract":"<div><p>This study investigates the mechanism of bicarbonate in-situ leaching in the Qianjiadian sandstone-type uranium deposit. A series of leaching experiments were conducted using bicarbonate concentrations ranging from 2200 to 7500 mg/L. The results indicate that HCO₃⁻ enhances uranium mobilization by promoting the formation of soluble uranyl carbonate complexes. However, excessive bicarbonate concentrations were found to induce passivation and secondary precipitation, which adversely affect leaching efficiency. These observations were further corroborated by kinetic modeling using the USCM, Zhuravlev, and Avrami equations. The kinetic analysis revealed a progressive shift in the rate-limiting step-from interfacial chemical reaction control to diffusion-controlled and eventually hybrid control-as the bicarbonate concentration increased. An optimal concentration of approximately 6000 mg L⁻¹ was identified, under which the maximum uranium leaching rate reached 71.7%. These findings offer a foundation for the precise regulation of lixiviant composition in industrial operations, thereby enabling improved uranium recovery and more efficient reagent utilization.</p></div>","PeriodicalId":661,"journal":{"name":"Journal of Radioanalytical and Nuclear Chemistry","volume":"335 9","pages":"5853 - 5871"},"PeriodicalIF":1.7,"publicationDate":"2026-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149023212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Boosting charge transfer of COF/g-C3N4 composites for highly synergetic photocatalytic removal of U(VI), Cr(VI) and BPA","authors":"Yubing Sun,&nbsp;Nalan Zeng,&nbsp;Weiyu Zhu,&nbsp;Shuai Tang,&nbsp;Xirui Lu","doi":"10.1007/s10967-026-11059-9","DOIUrl":"10.1007/s10967-026-11059-9","url":null,"abstract":"<p>The combined pollution of radionuclides, heavy metals and organics during uranium mining (i.e., association/coexist with heavy metals) or reprocessing of spent fuel (i.e., organic extraction) has become a prominent issue nowadays. Herein, the synergetic removal mechanism of U(VI), Cr(VI) and bisphenol(BPA) on porous covalent organic framework/graphitic carbon nitride (COF/g-C₃N₄) was investigated using optical, microscopic and spectroscopic techniques. Compared to g-C₃N₄ (1%), the high photocatalytic reduction (77%) and the excellent stability (90% after 5 recycles) of U(VI) on COF/g-C₃N₄ could be attributed to the highly efficient separation of photogenerated carrier and wide response range of COF/g-C₃N₄ under visible light (low band gap of 1.98 eV). In the ternary system, the increased removal of U(VI) on COF/g-C₃N₄ was due to the consumption of h⁺ by Cr(VI) and BPA, whereas the further increase of Cr(VI) and BPA inhibited U(VI) removal due to the competition of active sites. The interaction mechanism of U(VI) on COF/g-C₃N₄ was ascribed to superoxide radicals by trapping and XPS analysis. These findings are crucial for the actual application of COF/g-C₃N₄ on simultaneous removal of radionuclides, heavy metals and organic in complexed systems.</p>","PeriodicalId":661,"journal":{"name":"Journal of Radioanalytical and Nuclear Chemistry","volume":"335 8","pages":"5721 - 5730"},"PeriodicalIF":1.7,"publicationDate":"2026-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148816190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ultra-fast and efficient removal of thorium from aqueous solutions by carbonated waste concrete powder","authors":"Xiaowei Ouyang,&nbsp;Shikai Chen,&nbsp;Weiyu Li,&nbsp;Jiongqi Chen,&nbsp;Gaosheng Zhang,&nbsp;Yuwei Ma,&nbsp;Xiaowu Huang,&nbsp;Jiyang Fu","doi":"10.1007/s10967-026-11071-z","DOIUrl":"10.1007/s10967-026-11071-z","url":null,"abstract":"<div><p>Carbonated waste concrete powder (CWCP), a CO₂-mineralized derivative of construction waste, was developed for Th(IV) removal from aqueous solutions, integrating waste-concrete recycling, CO₂ mineralization, and radionuclide immobilization. CWCP achieved more than 99.8% Th(IV) removal over pH 2.0–9.0 and reduced Th(IV) in wastewater to 0.009 mg L⁻¹ at a dosage of 4.0 g L⁻¹. The Langmuir apparent maximum capacity was 1917.71 mg g⁻¹. Characterization indicated a precipitation–anchoring–hydrogen-bonding pathway involving amorphous Th(OH)₄.</p></div>","PeriodicalId":661,"journal":{"name":"Journal of Radioanalytical and Nuclear Chemistry","volume":"335 8","pages":"5659 - 5673"},"PeriodicalIF":1.7,"publicationDate":"2026-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148816187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}