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Adsorption of cesium using supermolecular impregnated XAD-7 composite: isotherms, kinetics and thermodynamics
In this study, CBC/XAD-7 was prepared by embedding CBC into XAD-7. Subsequently the as-prepared sorbent was used for the removal of cesium from aqueous solution as functions of HNO3 concentration, contact time, temperature and initial cesium concentration. The results revealed that the nitric concentration influenced cesium adsorption by complex and protonation interaction. The most effective adsorption happened at the nitric concentration of 1.0  M. The adsorption isotherm well described with the Langmuir model illustrated a monolayer adsorption. Its maximum adsorption capacity was 24.4 mg/g in the 2 M nitr...
Source: Journal of Radioanalytical and Nuclear Chemistry - July 20, 2019 Category: Nuclear Medicine Source Type: research

Extraction-chromatographic behavior of Zr(IV) and Hf(IV) on TRU and LN resins in mixtures of HNO 3 and HF
AbstractThe behavior of group-4 homologs Zr and Hf on extraction-chromatographic sorbents LN resin and TRU resin in mixtures of HF and HNO3 is considered. Distribution coefficients of the elements in the mixtures of 5 ·10−4 M –1 M HF and 0.01 M–5 M HNO3 are determined. Strong retention of both elements was found on LN resin in the range of concentrationsc(HF)  ≤ 0.01 M for all concentrations of HNO3. Retention tends to gradually disappear while increasingc(HF) to 0.5  M. On TRU resin retention is observed only in solutions withc(HNO3)  ≥ 2&...
Source: Journal of Radioanalytical and Nuclear Chemistry - July 20, 2019 Category: Nuclear Medicine Source Type: research

Investigation on the radiolytic stability of polybenzimidazole-based polymeric resins for the recovery of lanthanides, actinides, palladium from aqueous medium
AbstractRadiolytic stability of polymeric resins is an important aspects in nuclear materials processing. The different dosage of gamma radiation was subjected to meta-polybenzimidazole (m-PBI), para-polybenzimidazole (p-PBI) and pyridine-m-PBI based polymeric resins, which was taken for the present radiolytic stability investigation. Irradiated polymers were characterized by FT-IR, SEM and TGA analysis. Extraction of U(IV) and Pd(II) as a function of nitric acid concentration using 50, 100 and 150  kGy gamma irradiated polymeric resins was carried out and static capacity was also investigated for the gamma irradiated...
Source: Journal of Radioanalytical and Nuclear Chemistry - July 20, 2019 Category: Nuclear Medicine Source Type: research

Recycling of isotopically modified molybdenum from irradiated CerMet nuclear fuel: part 4 —technetium separation from concentrated molybdate solution
AbstractUranium-free molybdenum-based CerMet fuels can be applied for transmutation of minor actinides in GEN IV reactors or ADS. In a reprocessing concept designed in the first paper in this mini-series (Mare š and John in J Radioanal Nucl Chem 320(1):227–233,2019.https://doi.org/10.1007/s10967-019-06456-2) the residual radionuclidic impurities need to be separated from slightly alkaline (pH 9.1) highly concentrated ammonium molybdate solutions. Screening tests of technetium extraction onto three extraction chromatographic materials were performed in present study. Solid extractants based on Aliquat® 336 ...
Source: Journal of Radioanalytical and Nuclear Chemistry - July 20, 2019 Category: Nuclear Medicine Source Type: research

213 Bi production and complexation with new picolinate containing ligands
AbstractBinding of bismuth cation with two newly synthesized picolinate containing acyclic (L1) and macrocyclic (L2) ligands was studied. Both ligands demonstrate complex formation with Bi3+ under ambient conditions with high complexation constants. Serum stability of the complexes was investigated in serum protein excess of 10- and 100-times. Experiments with no-carrier-added radiobismuth (207Bi and213Bi) were performed. A one-column225Ac/213Bi generator system, based on Ac resin (Triskem Inc.), was tested. The overall yield of213Bi was exceeding 85% with225Ac breakthrough below 10−4%. (Source: Journal of Radioanaly...
Source: Journal of Radioanalytical and Nuclear Chemistry - July 20, 2019 Category: Nuclear Medicine Source Type: research

Migration characteristics study of iodine in crushed Beishan granite column under dynamic flow condition
AbstractThe migration of iodine on Beishan granite was studied by the dynamic column method using an UV detector. Migration parameters, such as distribution coefficient (Kd) and dispersion coefficient (Dd), can be obtained by fitting the breaking through curve.Kd was around 0.15  cm3 g−1 under all studied conditions except particle size.Dd was greatly influenced by the flow rate and eluent pH. The effect of speciation was not obvious. The appropriate I− concentration range for this method was 10−4–10−3 mol L−1. The results in this work are consistent with the previous...
Source: Journal of Radioanalytical and Nuclear Chemistry - July 20, 2019 Category: Nuclear Medicine Source Type: research

Measurement of half-lives for 87m,g Y and 196m,g,194 Au produced from the photon and neutron induced reactions of 89 Y and 197 Au
AbstractWe have measured the half-lives of87mY and87gY produced from the89Y( γ, 2n) and89Y(n, 3n) reactions with the bremsstrahlung end-point energy of 65  MeV and the average neutron energy of 37.2 MeV using an activation and an off-line γ-ray spectrometric technique, respectively. The bremsstrahlung photon was produced by using the 100 MeV electron linac of the Pohang Accelerator Laboratory (PAL), whereas the fast neutron was produced from the9Be(p, n) reaction by using the 45  MeV proton of the MC-50 Cyclotron at the Korea Institute of Radiological and Medical Sciences (KIRAMS). We have a...
Source: Journal of Radioanalytical and Nuclear Chemistry - July 20, 2019 Category: Nuclear Medicine Source Type: research

Automated separation of 99 Tc using plastic scintillation resin PSresin and openview automated modular separation system (OPENVIEW-AMSS)
AbstractAutomated methods for the analysis of radionuclides potentially increase laboratory productivity by reducing operator intervention and increasing the number of samples that can be treated in a given time. To this end, here we report a new openview automated modular separation system which can be used in combination with PSresin, in this case, for the analysis of99Tc. Quality parameters of this method using the automated system were comparable to those obtained manually and quantification of water samples spiked with low levels of99Tc resulted in deviations lower than 10% for all the samples analysed. (Source: Journ...
Source: Journal of Radioanalytical and Nuclear Chemistry - July 19, 2019 Category: Nuclear Medicine Source Type: research

Coumarin reactivity in free radical reactions
AbstractIn the present work the final products of coumarin radiation chemical transformation are investigated by chromatography. During radiolysis of coumarin by a60Co- γ-source, ethanal concentrations were determined and radiation chemical yields for different systems were calculated. A hypothesis of coumarin reactivity in free radical reactions with$${\text{CH}}_{3} {\dot{\text{C}}\text{HOH}}$$ is suggested. Coumarin was shown to have reducing properties with carbon-centred α-hydroxyethyl free radicals. Coumarin antioxidant activity increased in the presence of zinc (II) ions. (Source: Journal of Radioan...
Source: Journal of Radioanalytical and Nuclear Chemistry - July 19, 2019 Category: Nuclear Medicine Source Type: research

Spatiotemporal distribution of dissolved radon in uranium impacted aquifers of southwest Punjab
In this study, an initiative has been taken to assess the doses due to dissolved radon in drinking water. In addition, the U–Rn couple is evaluated in detail along with othe r hydrochemical parameters. The radon concentration ranges from 360–1700 Bq/m3 for Faridkot and 140 –1400 Bq/m3 for Muktsar for both seasons and the related average total dose due to radon for both season of Faridkot and Muktsar are 9.79  µS/year and 7.74 µS/year respectively. The total dissolved uranium is in range of 16–350 µg/L for Faridkot and 14–106 µg/L for Muktsa...
Source: Journal of Radioanalytical and Nuclear Chemistry - July 18, 2019 Category: Nuclear Medicine Source Type: research

Efficient scavenging of uranium (VI) using porous hexagonal boron nitride by a combined process of surface adsorption and induced precipitation crystallization
AbstractAn ammonium/hydroxyl-enriched p-BN microrods were synthesized and the adsorption behavior of uranyl on p-BN was systematically studied. The adsorption kinetic and isotherm studies revealed the adsorption behavior is independent on electrostatic attraction or chemisorption. The results demonstrate uranyl hydrolyzed precipitated crystals are formed on the surface of p-BN at an optimized pH of 2.86 and the maximum adsorption capacity can reach 413  mg g−1 atT = 303 K. A hypothetical adsorption mechanism with a combination of surface adsorption and induced precipitation crystallizatio...
Source: Journal of Radioanalytical and Nuclear Chemistry - July 18, 2019 Category: Nuclear Medicine Source Type: research

Arcebs-2018
(Source: Journal of Radioanalytical and Nuclear Chemistry)
Source: Journal of Radioanalytical and Nuclear Chemistry - July 18, 2019 Category: Nuclear Medicine Source Type: research

A method for the mg scale separation of curium(III) from americium(III) by HPLC using a SCX column
AbstractA method intended for the mg scale separation of curium (Cm) from americium (Am) and plutonium (Pu) based on high pressure liquid chromatography using a strong cation exchange column has been investigated. Reproducible separations were achieved on the Luna SCX (Phenomenex) column with α-hydroxymethylbutyric acid (α-HMBA) as eluant. The separation performance was investigated on the tracer level varying the pH, concentration, temperature and flow rate of the eluting solution. It was found that 0.1 M α-HMBA at a pH of 3.7 using a flow-rate of 1 mL/min, gave enough peak resolut ion for an e...
Source: Journal of Radioanalytical and Nuclear Chemistry - July 18, 2019 Category: Nuclear Medicine Source Type: research

The gross beta activity of surface sediment in different urban landscape areas
AbstractSediment samples were collected from urban zones in Ekaterinburg over the course of a year in order to analyze the gross beta activity. The bulk samples were categorized into three size groups: dust, fine sand, and coarse sand. A small amount of the obtained samples was used to develop a new method for measuring the concentration of gross-beta activity. The results show a statistically significant trend in beta-activity as the dust size of the samples increased between winter and autumn. The observed dependencies reflect geochemical processes in the formation and transportation of urban sediment. (Source: Journal o...
Source: Journal of Radioanalytical and Nuclear Chemistry - July 18, 2019 Category: Nuclear Medicine Source Type: research

Recovery of molybdenum by solvent extraction from simulated high level liquid waste
In this study, simple and a rapid solvent extraction method is investigated to recover Mo(VI) from simulated HLLW. The (NH4)6Mo7O24·4H2O dissolved in 3  M HNO3 was treated with ascorbic acid and KSCN to form orange red colored Mo(V)-SCN. Reduction of Mo(VI) was confirmed by cyclic voltammetry. The freshly formed complex was completely extracted to ethyl acetate layer. The organic solvent could be recovered using rotary evaporator. The Mo-complex disproportionated gradually to form a yellow solid, Mo(OH)2(SCN)3·6H2O, which forms MoO3 @ 400  °C. The solid product was characterized by XRD, FT-IR, E...
Source: Journal of Radioanalytical and Nuclear Chemistry - July 12, 2019 Category: Nuclear Medicine Source Type: research

Ultralight sulfonated graphene aerogel for efficient adsorption of uranium from aqueous solutions
AbstractAn ultralight sulfonated graphene aerogel (GA-SO3H) was synthesized via simply gas phase sulfonation and was adopted to adsorb U(VI) from radioactive wastewater. The characterization confirmed plentiful sulfonate groups on GA-SO3H surfaces. GA-SO3H exhibited high U(VI) sorption capacity with maximum amount of 148.4  mg g−1 and reached maximum separation selectivity of 61.38% at 298  K and pH 5.0 due to the surface complexation between the O atoms of sulfonate groups and uranyl ions. Furthermore, GA-SO3H exhibited satisfied regeneration and excellent structural stability. This paper highlighted ...
Source: Journal of Radioanalytical and Nuclear Chemistry - July 12, 2019 Category: Nuclear Medicine Source Type: research

Production of spiked vegetation samples containing γ-emitting radionuclides for proficiency testing
AbstractThe production of environmental reference materials such as soil, sediment, water and vegetation containing radionuclides for interlaboratory comparison is a vitally important contribution to environmental monitoring. Laboratories that carry out such monitoring need to demonstrate that their results are reliable. The IRD National Intercomparison Program (PNI) produces and distributes reference materials used to check laboratory performance. This work demonstrates the feasibility of producing vegetation (grass) samples containing60Co,65Zn,134Cs, and137Cs by the spiked sample method. The preparation and the statistic...
Source: Journal of Radioanalytical and Nuclear Chemistry - July 12, 2019 Category: Nuclear Medicine Source Type: research

Three-dimensional graphene materials for UO 2 2+ electrosorption
AbstractIn this paper, three-dimensional graphene (3DG) electrode material was prepared by hydrothermal reduction using graphene oxide as precursor. Its morphology and structure were characterized by SEM, BET, XRD, Raman, FTIR and TG, and its electrochemical performance was also measured. The results showed that 3DG possessed hierarchical pore structure, large specific surface area, high specific capacitance and low impedance. Using 3DG as electrode material for electrosorption of UO22+, it showed that the saturated adsorption capacity can reach up to 113.80  mg g−1 and the adsorption rate is 0.32  mg&...
Source: Journal of Radioanalytical and Nuclear Chemistry - July 12, 2019 Category: Nuclear Medicine Source Type: research

Preliminary biological evaluation of 68 Ga-labeled cyclic RGD dimer as an integrin α v β 3 -targeting radiotracer for tumor PET imaging
AbstractRadiolabeled cyclic arginine-glycine-aspartic acid (RGD) peptides have been widely prepared for noninvasive monitoring of tumor angiogenesis. The aim of this study was to explore and evaluate the feasibility of a novel68Ga-labeled RGD peptide for tumor angiogenesis imaging. [68Ga]Ga-NOTA-PEG3- β-Glu-RGD2, a cyclic RGD dimer with a symmetric β-glutamate linker, was successfully designed and radiolabeled in high radiochemical yields. A series of experiments in vivo and in vitro were investigated to perform a preliminary evaluation and confirm good target at integrin αvβ3-positive tumor cells. The...
Source: Journal of Radioanalytical and Nuclear Chemistry - July 11, 2019 Category: Nuclear Medicine Source Type: research

Correction to: Sorption of radioactive cobalt onto nano calcium silicate/CuO composite modified by humic acid
In the original publication of the article, Figs.  8, 9 and 10 were published incorrectly as linear regression. (Source: Journal of Radioanalytical and Nuclear Chemistry)
Source: Journal of Radioanalytical and Nuclear Chemistry - July 11, 2019 Category: Nuclear Medicine Source Type: research

Adsorption of thorium(IV) from aqueous solutions by poly(cyclotriphosphazene- co -4,4 ′-diaminodiphenyl ether) microspheres
AbstractPoly(cyclotriphosphazene-co-4,4 ′-diaminodiphenyl ether) microspheres (PZA) was based on hexachlorocyclotriphosphazene (HCCP) and 4,4′-diaminodiphenyl ether (ODA). It was synthesized via one-step precipitation method. The PZA microspheres were characterized by FT-IR, XPS, zeta potential and SEM/EDS. Through experimental resear ch, PZA microspheres had the optimal adsorption performance with pH value 3.5, contact time of 60 min, thorium(IV) ions concentration of 30 mg L−1, and PZA microspheres of 10  mg. The maximum adsorption capacity of PZA microspheres for thorium(IV) was 29....
Source: Journal of Radioanalytical and Nuclear Chemistry - July 10, 2019 Category: Nuclear Medicine Source Type: research

Comparison of several models for fitting breakthrough curves of radionuclides transport in crushed rock: groundwater systems
AbstractThe mutual comparison of six models for fitting the experimental breakthrough curves of137Cs+ and85Sr2+ transportation in the crushed rock –groundwater system is described. The models are: Clark, Thomas, modified dose–response, Yan, Yoon–Nelson and the authors’ models. These mathematical models are regarding models with continuous inlet of the radionuclides into column, and where the dependence of activity concentration on the timeC  =  f(t) can be expressed explicitly. The use of these models should help in the more accurate determination of the retardation coefficients of rad...
Source: Journal of Radioanalytical and Nuclear Chemistry - July 10, 2019 Category: Nuclear Medicine Source Type: research

Simple measurement of actinides in urine using solid-state scintillation
AbstractRapid methods for determination of internal contamination play a key role during emergency situations in particular for incident response teams and affected populations. For this reason, these methods and their particular techniques must be fast, reliable, robust, simple and cost-efficient, as well as providing high-quality throughput. On the other hand, they are characterized by lower precision and they are often biased. The presented method is based on direct measurement of urine using powder scintillator YAP:Ce together with an alkaline medium as a replacement for traditional liquid scintillation cocktail. The o...
Source: Journal of Radioanalytical and Nuclear Chemistry - July 10, 2019 Category: Nuclear Medicine Source Type: research

Improving the efficiency in the detection of gamma activities in environmental soil samples: influence of the granulometry and soil density
AbstractIn this work the efficiency calibration curves for a HPGe gamma detector were obtained  from soil standards prepared in our laboratory using typical Argentine regional soils. They were made in pot and Petri dish geometries, for different soil granulometries, by using two mixed nuclide reference solutions manufactured by Eckert& Ziegler and provided by the IAEA. The efficiency curves obtained were tested with the reference materials IAEA-375, IAEA-447, CNEA-81-11 as well as the soil sample used in the IAEA-2013 proficiency test. The results allow to improve the quality in the analytical measuremen...
Source: Journal of Radioanalytical and Nuclear Chemistry - July 10, 2019 Category: Nuclear Medicine Source Type: research

Effective adsorption of Co 2+ and Sr 2+ ions by 10-tungsten-2-molybdophosphoric acid supported amine modified magnetic SBA-15
In this study, 10-tungsten-2-molybdophosphoric acid supported amine-functionalized magnetic SBA-15 with core –shell morphology was prepared and its applicability as effective inorganic adsorbent for Co2+ and Sr2+ removal was investigated. The adsorbent was characterized by X-ray powder diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy, scanning electron microscopy, vibrating sample magnetometer, inductively coupled plasma analysis and N2 physical adsorption –desorption technique. The effective parameters including dosage of adsorbent, contact time, initial concentration of m...
Source: Journal of Radioanalytical and Nuclear Chemistry - July 10, 2019 Category: Nuclear Medicine Source Type: research

Synthesis and bioevaluation of novel radioiodinated PEG-modified 2-nitroimidazole derivatives for tumor hypoxia imaging
AbstractTwo novel radioiodinated PEG-modified 2-nitromidazole derivatives were prepared. The two radiotracers demonstrate good stability in vitro. In the cellular uptake experiments, the uptakes in hypoxic condition are higher than those in aerobic condition for two radiotracers. The biodistribution results in mice bearing S180 tumor demonstrate the uptakes of the two radiotracers in tumor show maximum at 1  h. The two radiotracers could be eliminated quickly from normal tissue. In SPECT/CT imaging study, the tumor could be observed clearly in S180 tumor using the two radiotracers. These results suggest they are worth...
Source: Journal of Radioanalytical and Nuclear Chemistry - July 10, 2019 Category: Nuclear Medicine Source Type: research

Thermophysical properties of neat and radiolytically degraded acidic extractants present in room temperature ionic liquid
AbstractThe thermophysical properties of a couple of acidic extractants, namely bis(2-ethylhexyl)phosphoric acid (D2EHPA) and bis(2-ethylhexyl)diglycolamic acid (HDEHDGA), dissolved in the room temperature ionic liquid diluent 1-butyl-3-methylimidazolium bis(trifluoromethanesulphonyl)imide ([C4mim][NTf2]) were investigated. The physical properties such as density, viscosity, and refractive index were measured as a function of various parameters such as temperature, concentration of extractant, and concentration of nitric acid. The viscosity of the gamma-ray irradiated solution composed of 0.06  M D2EHPA/[C4mim][NTf2] ...
Source: Journal of Radioanalytical and Nuclear Chemistry - July 10, 2019 Category: Nuclear Medicine Source Type: research

Separation of NCA 88 Zr from proton irradiated nat Y target: a novel approach using low cost bio-sorbent potato peel charcoal
AbstractSeparation of no-carrier-added (NCA)88Zr from natural yttrium target irradiated with proton beam has been studied using nature-resourced material, potato peel, which is a commonly available domestic waste. Here, an attempt has been undertaken to exploit natural resource as separating agent. Good separation of NCA88Zr from bulk Yttrium target could be achieved at 0.01 M HCl concentration, when extraction was carried out using 20  mg potato peel charcoal—a natural bio-sorbent.88Zr was extracted in the solid phase leaving behind bulk Y in the aqueous phase. (Source: Journal of Radioanalytical and Nuclear Chemistry)
Source: Journal of Radioanalytical and Nuclear Chemistry - July 9, 2019 Category: Nuclear Medicine Source Type: research

The radiation dose and distribution coefficient of 210 Po and 210 Pb concentrations in aquatic environs of major rivers of coastal Karnataka
AbstractThe activity of210Po and210Pb was measured in different matrices of aquatic ecosystem of the major rivers of Coastal Karnataka viz, Kali, Sharavathi and Netravathi. The environmental samples such as surface water, suspended particulate matter and sediment have been subjected to analyses. The activity of these two radionuclides were determined by radiochemical separation of210Po and counting the activity using a ZnS(Ag) alpha counter. The activity ratio of210Po and210Pb and correlation between the activity of these radionuclides were studied. From the measured concentration of210Po and210Pb, the internal Committed E...
Source: Journal of Radioanalytical and Nuclear Chemistry - July 9, 2019 Category: Nuclear Medicine Source Type: research

Exposure risk assessment of uranium intake of the milk products from the region of Pernambuco, Brazil
AbstractIn a project sponsored by the NUCLEBR ÁS, were mapped uraniferous anomalies in the municipalities of Pedra and Venturosa, in the rural region of Pernambuco, Brazil. As these municipalities are the main milk producers in this State, it was of interest in this work to investigate the levels of natural uranium in milk, curdled cheese and milk whey, produced by the cattle in these districts and nearby areas. Conventional uranium fluorimetry was used for analyses. The concentrations of uranium were higher in the milk whey. The milk and cheese produced in this area are insufficient to produce toxicity in the kidne...
Source: Journal of Radioanalytical and Nuclear Chemistry - July 8, 2019 Category: Nuclear Medicine Source Type: research

Design and performance of an automated single column sequential extraction chromatographic system
AbstractAn automated extraction chromatographic system and its virtual instrument system based on LabVIEW platform have been developed and characterized to perform single column-based sequential radiochemical procedures. The developed system was characterized by its dead volume and memory effect pertinent to fluidic tubing, and the linearity of feeding pump speed. An automated sequential procedure was developed for the rapid and reproducible separation of strontium from calcium, barium and yttrium with strontium selective resin. (Source: Journal of Radioanalytical and Nuclear Chemistry)
Source: Journal of Radioanalytical and Nuclear Chemistry - July 5, 2019 Category: Nuclear Medicine Source Type: research

Characterization of dry tube location in KAMINI reactor towards the development of k 0 -based IM-NAA
AbstractCharacterization studies were carried out for the freshly installed dry tubes (DT-1 and DT-2) in KAMINI reactor. The maximum gold equivalent neutron flux at 20  kW for DT-1 and DT-2 were found to be (1.02 ± 0.02)E+10 cm−2 s−1 at 368 and (4.90  ± 0.30)E+7 cm−2 s−1 at 300  mm respectively. The sub-cadmium to epithermal neutron flux ratio (f) and epithermal neutron flux shape factor (α) were found to be 144  ± 7 and − 0.289 ± 0.010 respectively at this position fo...
Source: Journal of Radioanalytical and Nuclear Chemistry - July 5, 2019 Category: Nuclear Medicine Source Type: research

Effective biosorption of U(VI) from aqueous solution using calcium alginate hydrogel beads grafted with amino-carbamate moieties
AbstractNovel amino-carbamate moiety grafted calcium alginate hydrogel beads (CA-1) were synthesized by reacting sodium alginate with 4-phenylsemicarbazide followed by ionotropic crosslinking with Ca(II) ions. As compared to pure calcium alginate hydrogel beads (CA), CA-1 exhibited fast kinetics and enhanced sorption capacity towards U(VI) ions, from mild acidic conditions. The sorption kinetic could be described by pseudo-second order equation, with the chemisorption as the rate-controlling step. The sorption isotherm were fitted well by Langmuir (qm = 233.2 mg/g at 298 K). CA-1 hydrogel beads exhi...
Source: Journal of Radioanalytical and Nuclear Chemistry - July 5, 2019 Category: Nuclear Medicine Source Type: research

Alpha-spectroscopic analysis of uranium in ground- and seawater samples after EDTA-masking of interfering cations
AbstractThe effect of EDTA-masking on the alpha-spectral characteristics corresponding to uranium analysis in ground- and seawater samples after cation-exchange and electrodeposition is systematically investigated. Addition of EDTA (1  mmol l−1) to the investigated samples results in dramatic increase of the spectra quality, including improvement of the separation efficiency up to 75% and 85% for ground and seawaters, respectively. For EDTA concentrations lower than 1  mmol l−1 the spectral resolution and counting efficiencies decline, whereas for higher concentrations the resolution increas...
Source: Journal of Radioanalytical and Nuclear Chemistry - July 5, 2019 Category: Nuclear Medicine Source Type: research

Investigation of U(VI), Th(IV), and Eu(III) ions ’ sorption behavior onto silica gel modified with anhydride
This study indicated that SiO2–BDAH can remove U(VI) and Th(IV) at the same time in the presence of multiple ions from waste water quickly. (Source: Journal of Radioanalytical and Nuclear Chemistry)
Source: Journal of Radioanalytical and Nuclear Chemistry - July 4, 2019 Category: Nuclear Medicine Source Type: research

Determination of tritium levels in environmental samples around NIPNE, Romania from 2007 to 2017
AbstractNational Institute for Physics and Nuclear Engineering (NIPNE) Romania is located in M ăgurele and approximately 10 km from Bucharest. A continued surveillance over the past 10 years offers the opportunity to verify the tritium releases, but also for development of monitoring methods. The determined levels are well below the maximum admissible limits for environmental samples. Dose values have no impact on the environment and have an insignificant contribution to the cumulative annual dose. Comparison with global, regional and zonal levels highlights the role played by its emissions in the Lower Danube B...
Source: Journal of Radioanalytical and Nuclear Chemistry - July 4, 2019 Category: Nuclear Medicine Source Type: research

Removal of thorium and uranium from aqueous solution by adsorption on hydrated manganese dioxide
AbstractThe hydrated manganese dioxide (HMO) was synthesized by hydrothermal process using MnSO4 and KMnO4. The adsorption of HMO for Th(IV) and U(VI) were investigated by batch static adsorption experiments. The HMO and MnO2 were characterized by FT-IR, XRD and SEM. At the same time, the adsorption mechanism is discussed. The adsorption process was in line with the pseudo-second-order kinetic model and Langmuir isothermal model. The maximum adsorption capacities were Th (T = 308 K,C0 = 200 mg L−1,qmax = 218.34 mg g−1) and U (T = 3...
Source: Journal of Radioanalytical and Nuclear Chemistry - July 3, 2019 Category: Nuclear Medicine Source Type: research

Estimation of 14 C in irradiated graphite using CO 2 gasification method
AbstractPresent paper reports development of a simple procedure for estimation of14C in irradiated graphite samples. The process utilizes decomposition of the graphite samples by heating followed by absorption of the generated carbon dioxide in ethanolamine and analysis using liquid scintillation analyzer. The interference due to tritium was removed by acid scrubbing. The optimized method has successfully been used for analysis of a large number of actual graphite samples irradiated in research reactor. The method can specifically be used for estimation of low active specimen and even in presence of fission products and ac...
Source: Journal of Radioanalytical and Nuclear Chemistry - July 1, 2019 Category: Nuclear Medicine Source Type: research

Polypropylene nonwoven fabric modified with oxime and guanidine for antibiofouling and highly selective uranium recovery from seawater
AbstractA novel adsorbent for antibiofouling and highly selective uranium recovery from seawater is developed in this work. Specifically, the polypropylene nonwoven fabric modified with oxime and guanidine was obtained by subsequent radiation-grafting, ring-opening and oximation reaction. The adsorbent demonstrates outstanding selectivity for uranium(VI) against other competing metal ions in real seawater. The antibacterial assay indicated the adsorbent has good antibacterial properties againstEscherichia coli and Staphylococcus aureus. XPS spectra indicate that uranium(VI) is adsorbed on the non-woven through the interact...
Source: Journal of Radioanalytical and Nuclear Chemistry - June 17, 2019 Category: Nuclear Medicine Source Type: research

Method for detecting and characterising actinide-bearing micro-particles in soils and sediment of the Fukushima Prefecture, Japan
AbstractThe Fukushima Dai-ichi nuclear power plant accident released limited amounts of actinides on soils of Japan. Characterisation of these particles is essential to determine the fate of actinides in the environment. The method presented in this paper, based onα-tracks detections, microscope observations and mass-spectrometry measurements, was designed to identify and characterize actinide-bearing particles in soil samples. The method was tested on a road dust sample collected in the main radioactive plume of the Fukushima region. Accordingly,α-tracks detection was demonstrated to provide a powerful techniq...
Source: Journal of Radioanalytical and Nuclear Chemistry - June 17, 2019 Category: Nuclear Medicine Source Type: research

Synthesis and characterization of pyridyl anion exchange resin for 99 Tc removal
AbstractA new pyridyl anion exchange resin (PS-N) was synthesized by chloroacetylation and quaternization on the polystyrene-divinylbenzene microspheres (PS) and was characterized by FT-IR, TGA, and X-ray photoelectron spectroscopy. PS-N was applied to study the removal of Re(VII), a chemical analogue of99Tc, to investigate the effect of solution acidity, resin dose and contact time on the adsorption efficiency. The adsorption process corresponded with the Langmuir isotherm model and matches well with pseudo-second-order kinetics. Based on the adsorption results of Re(VII), the adsorption efficiency of99Tc was examined to ...
Source: Journal of Radioanalytical and Nuclear Chemistry - June 17, 2019 Category: Nuclear Medicine Source Type: research

Simulated workplace neutron fields of $$^{241}$$ 241 Am –Be source moderated by polyethylene spheres
AbstractSimulated workplace neutron fields of a$$^{241}$$Am –Be source moderated by polyethylene spheres have been developed. The characterization in terms of neutron fluence rate and neutron ambient dose equivalent rate,$$H^*(10)$$, was performed using Bonner sphere spectrometer and the MAXED and FRUIT unfolding codes. The neutron fluence rates and the$$H^*(10)$$ rates obtained from the two codes are in good agreement with the discrepancies of 8% and 6%, respectively. The neutron ambient dose equivalent-averaged energies and the neutron fluence-to-dose equivalent conversion coefficients were also evaluated in compar...
Source: Journal of Radioanalytical and Nuclear Chemistry - June 17, 2019 Category: Nuclear Medicine Source Type: research

Complete dissolution of solid matrices using automated borate fusion in support of nuclear decommissioning and production of reference materials
In this study, we describe an automated procedure for borate fusion of multiple matrices encountered in nuclear decommissioning, containing diverse radionuclides over a range of activity concentrations. The impact of digestion flux, sample mass and sample to flux ratios are described, as well as the subsequent separation and measurement techniques. The results contribute to accurate and precise measurement of radionuclides in various matrices, as well as to characterisation of reference materials, providing greater confidence in nuclear industry programmes worldwide. (Source: Journal of Radioanalytical and Nuclear Chemistry)
Source: Journal of Radioanalytical and Nuclear Chemistry - June 17, 2019 Category: Nuclear Medicine Source Type: research

Multiwalled Carbon Nanotubes: Adsorbent for Ruthenium from Aqueous Solution
AbstractThis paper describes the adsorption behavior of ruthenium on multi walled carbon nanotubes (MWCNTs) from aqueous solution. The adsorption behavior of ruthenium on MWCNTs was studied with respect to contact time, pH, concentration of metal ion, adsorbent dosages and temperature. The equilibrium adsorption data were fitted to Pseudo first order, Pseudo second order, Elovich and Intra-particle diffusion kinetic model as well as Langmuir, Freundlich, Dubinin –Radushkevich and Temkin isotherm models. The Langmuir adsorption isotherm model was found to be best fitted in terms of standard deviation and regression co...
Source: Journal of Radioanalytical and Nuclear Chemistry - June 15, 2019 Category: Nuclear Medicine Source Type: research

Source apportionment of carbonaceous aerosols during haze days in Shanghai based on dual carbon isotopes
We present dual carbon isotope constrained ( δ13C and Δ14C) source apportionment of organic carbon and elemental carbon in fine particulate matter (PM2.5) for five districts of Shanghai during the winter of 2013. The results show that spatial variations of the three source (biomass, liquid fossil fuel, and coal) apportionment of carbonaceous aerosol among different districts were evident. Overall, coal combustion, liquid fossil fuel combustion and biomass burning are the most important carbonaceous aerosols source in Pudong, Xuhui and Chongming, respectively. The results suggest that environmental protection po...
Source: Journal of Radioanalytical and Nuclear Chemistry - June 15, 2019 Category: Nuclear Medicine Source Type: research

Rapid synthesis of carbon materials by microwave-assisted hydrothermal method at low temperature and its adsorption properties for uranium (VI)
In this study, the effect of synthesis temperature and time on the morphology and structure of the carbon microspheres was investigated. The comparation between traditional hydrothermal and microwave-assisted hydrothermal method for preparing carbon materials was carried out. Finally, the adsorption performance of the material for uranium (VI) was tested. The results showed that microwave method has better heating rate than conventional hydrothermal method, the carbon material prepared by microwave-assisted hydrothermal method at low temperature and short time has excellent adsorption performance, and the maximum adsorptio...
Source: Journal of Radioanalytical and Nuclear Chemistry - June 15, 2019 Category: Nuclear Medicine Source Type: research

The effects induced by proton irradiation on structural characteristics of nuclear graphite
AbstractA grade TSX graphite was irradiated by a 2.5  MeV proton and a dose of 1.47 × 1018 ion cm−2 at 330  K. The displacement per atom under this irradiation condition was about 0.02. The lattice parameter, crystallite size and the vacancies density in the graphite was measured before and after irradiation. It was found that the proton irradiation led to an increase in the volume of the sample. The vo lume change in the irradiated sample was confirmed by atomic force and scanning electron microscopes observations as increased roughness and pore size. Also, FTIR results showed...
Source: Journal of Radioanalytical and Nuclear Chemistry - June 15, 2019 Category: Nuclear Medicine Source Type: research

Enhanced uranium bioleaching high-fluorine and low-sulfur uranium ore by a mesophilic acidophilic bacterial consortium with pyrite
AbstractThe high level of fluorine and low sulfur in the ore could significantly undermine the bioleaching effectiveness. Here, a strategy to improve the bioleaching efficiency by introducing fluoride-resistant mesophilic eosinophils coupled with pyrite supplement was investigated in a bioleaching system with such ore. The results of column and heap bioleaching showed that 89.25% and 90.40% of uranium were recovered with the consortium and pyrite addition, which increased the uranium leaching rates by 13.22% and 8.96% as compared with the sulfuric acid leaching. Hence, it provides a method to improve uranium bioleaching ef...
Source: Journal of Radioanalytical and Nuclear Chemistry - June 15, 2019 Category: Nuclear Medicine Source Type: research

Experimental study of a large plastic scintillator response with different reflective coverings based on digital pulse processing method
AbstractDigital pulse processing methods have various applications in radiation spectroscopy due to their unique properties. Here, the effect of light reflector on the response of a large plastic scintillator with different reflective coverings (Teflon tape, aluminum foil and black tape) coupled to a fast photomultiplier tube is investigated based on some extracted anode pulse features. Results showed that the pulse features were changed according to the reflection coefficient of the covering. For instance, the fall time of the average anode pulse shape for Teflon tape, aluminum foil and black tape coverings are 10.46, 6.8...
Source: Journal of Radioanalytical and Nuclear Chemistry - June 15, 2019 Category: Nuclear Medicine Source Type: research

Filtration tests of gaseous ruthenium tetroxide by sand bed and metallic filters
The objective is to determine if gaseous ruthenium tetroxide can be trapped by metallic filter and sand bed filter, both elements being used in filtered containment venting systems implemented on French pressurized water reactors. The results show no ruthenium tetroxide trapping by physical or chemical adsorption but certain retention is observed resulting from its thermal decomposition into solid ruthenium dioxide. A thermodynamic analysis of the system tends to confirm this conclusion. Chemical stability of RuO4(g) has to be considered as it strongly impacts potential filtration and so potential releases. (Source: Journa...
Source: Journal of Radioanalytical and Nuclear Chemistry - June 15, 2019 Category: Nuclear Medicine Source Type: research