Journal of Radioanalytical and Nuclear Chemistry最新文献

Based on the water samples collected from Minjiang river, the spatiotemporal pattern of stable isotopes in different waters and the influencing mechanisms were investigated in the article. Our findings suggested that the stable isotopes of oxygen and hydrogen in waters exhibited obvious spatiotemporal variations influenced by temperature and precipitation amount since precipitation is an important recharge source for Minjiang river water and that the ‘latitude effect’ was observed in the river water whereas the ‘elevation effect’ was obscured. The results of this study will be helpful in understanding the hydrological cycle and promoting the scientific management of water resources in basins at east transition of Qinghai–Tibet Plateau.

Radioisotopes of actinium are valuable because of their potential use in the medical industry. Actinium-225 shows promise for treating disease—like cancer—via targeted alpha therapy (TAT), and the longer-lived actinium-227 is the parent of two radionuclides with potential application in TAT radiopharmaceuticals, thorium-227 and radium-223. Continuing progress in the development of these medical applications requires robust and diverse methods for extracting and purifying actinium from a wide range of matrices. To define the strengths and limitations of separation methods commonly employed in actinium processing, we characterized the performance of ion exchange and extraction chromatographic steps for removing contaminants found in stainless steel (chromium, iron, nickel, and silicon) and aluminum from actinium-227. While AG-MP1 anion exchange resin with HCl_(aq) successfully removed iron, cation exchanger AG 50W-X8 removed most other contaminants. The most persistent contaminant was aluminum, which was removed using a DGA Normal extraction resin. These results are presented within the context of applying that methodology toward actinium purification strategies.

Nuclear power plants use boric acid with different ¹⁰B enrichment levels (from natural ratio to 90% ¹⁰B) as neutron absorber and at the end this constitutes a high-volume liquid waste. In this study, we aimed to find the optimal ratio of Portland cement and sulfoaluminate cement blend to improve the mechanical and chemical durability of final waste forms for borate immobilization. The standardized ASTM C1308-21 leaching test experimental method in combination with several analytical methods i.e. mechanical test, SEM, XRD, PGAA, ICP-OES, and ICP-MS were used to measure the boron elemental and isotopic leachability and its microstructural effect on the cement hydration characteristics of progressively increasing blend ratios of sulfoaluminate cement in Portland cement. The results indicated that the blend ratio of 20% sulfoaluminate cement to 80% Portland cement showed the best physical stability and lowest boron isotopic leachability from the final waste form.

Based on the precipitation isotopic data of Zhangye station, as well as daily meteorological data, the sub-cloud evaporation variations and their influence on precipitation isotopes with climate change were analyzed. The slope of the Local Meteoric Water Line at ground is lower than that under clouds, and the precipitation is affected by sub-cloud evaporation. Sub-cloud evaporation is most influenced by relative humidity with a negative influence, followed by precipitation amount (negative influence) and air temperature (positive influence). It is higher in the period of 2004–2020 relative to the period of 1986–2003, resulting in richer precipitation isotopes at ground in 2004–2020.

Twelve plant and corresponding soil samples were collected in twelve agricultural fields in Vietnam for analysis. The ²²⁶Ra activity concentrations (AC) varied from 24.5 to 43.1 Bq/kg (dry weight) in soil samples and 1.4–13.2 Bq/kg (dry weight) in plant samples. For seven studied plants, the soil-to-plant transfer factors of radium (TF) varied from 0.032 to 0.439 depending on plant types and the physicochemical properties of the soil. Some relationships were found between ²²⁶Ra TF and the properties of soil. TF positively correlated with clay content in soil (Pearson correlation coefficient (r) =  − 0.63) and organic matter (OM) in soil (r =  − 0.60). A negative correlation was found between TF and AC of ²²⁶Ra in porewater of soil (r = 0.66).

Securing global trade requires efficient screening of containers for threat materials. This work demonstrates a novel approach combining fast neutron activation analysis and artificial neural network (ANN) to identify elemental composition of sealed cargo, in particular elements carbon, oxygen, and nitrogen, which are the main components of explosives. This study shows that Rapidly Relocatable Tagged Neutron Inspection System in combination with ANN is a potential promising solution for the inspection of sealed containers, allowing precise identification of elements and detection of potential threats without the need to open the containers.

Integrating multiple targets and hence bio-distribution effectively for papillary thyroid carcinoma (PTC) treatment remains a significant challenge, which can be addressed by using suitable nano-scale materials. Herein, iRGD-modified graphene oxide (GO) loaded ¹³¹I are developed for the specific treatment of PTC strengthened integrin targeting. Fine structural characteristics of GO and GO-iRGDs were characterized by fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEC), Raman spectrum and X-ray photoelectron spectroscopy (XPS). The results showed that there were characteristic peaks and chemical bonds on GO and GO-iRGDs by FT-IR, the D-peak and G-peak of GO disappeared by Raman spectrum and C-N bond with iRGD of GO-iRGDs were strong by XPS. These ¹³¹I-GO-iRGDs and ¹³¹I-GOs were taken up by PTC cell (TPC-1, BCPAP, and IHH-4) through endocytosis after 48 h and 72 h in cell uptake test, especially the uptake rate of ¹³¹I-GO50-iRGD was the highest. The CCK-8 cytotoxicity test of ¹³¹I-GO-iRGDs and ¹³¹I-GOs showed that these nanoparticles toxicity were higher than that of Na¹³¹I and finally promoted PTC death. In vitro data verified the targeting mechanism of GO and ¹³¹I for PTC cell line is based on the relevant advantages of binding cell, followed by iRGD-endowed cell surface transport. The tailored design of GO-iRGDs validates a promising paradigm for radioisotope (131-iodine) delivery to combat PTC resistance and metastasis resulting from poor target access for effective combination therapy.

This paper reports the results of tests performed to evaluate the effects of key parameters on the effectiveness of several wet decontamination processes for removal of ⁶⁰Co, ¹³⁷Cs and ²⁴¹Am from pig skin. Parameters tested included decontamination reagent composition, radionuclide deposition solution composition, the time between contamination and decontamination, and skin thickness and moisture content. Gamma-spectroscopy was used to determine the percentage activity removed and to quantify radionuclide permeation. The composition of the solution used for radionuclide deposition affected radionuclide removal, especially ²⁴¹Am. Radionuclide permeation showed a strong effect of skin hydration; ¹³⁷Cs permeated quickly through the samples while ²⁴¹Am showed no permeation.

Uranium is a rare and important energy mineral. In order to study the distribution characteristics of uranium deposits, we establish a data restoration algorithm with fractal features and sparse known point data. The algorithm ensures the accuracy of the restoration and the retention of fractal features through the steps of determining the basis function, preserving the dimension invariant restoration, and dimension greedy optimization. By comparing the numerical test with the Kriging interpolation method, it is proved that the algorithm is better in accuracy error and dimension error when restoring the fractal feature data.

This study optimized Prussian Blue (PB) synthesis parameters to enhance its binding capacity for thallium (Tl(I)). Using direct (PB-1) and indirect (PB-2) methods, key parameters such as stirring time, drying conditions, oxidant concentration, and iron content were evaluated. For PB-1, the optimal conditions were 12-h stirring, 4-h drying at 60 °C, resulting in a maximum binding capacity (MBC) of 200 mg/g. For PB-2, the optimal parameters included 2-h drying at 80 °C, 20 mL oxidant, and 2-h aging at 60 °C, yielding an MBC of 208.33 mg/g. These findings ensure improved therapeutic efficacy of PB as an active pharmaceutical ingredient. Yes, the street name for the affiliation one is correct