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Monazite is found in igneous and other rocks but the richest concentrations are in placer deposits, concentrated by wave and current action with other heavy minerals. ... In Norway, Thor Energy is developing and testing a thorium-bearing fuel for use in existing nuclear power plants. Fuel rods containing thorium additive (Th-Add) and also ...
In all tested media, thorium accumulation in plants was after 7 days bigger at 0.5 mM Th than at the lower Th concentration (0.1 mM). The amount of thorium in roots increased in the presence of putrescine or in the absence of iron or phosphate ions, with the highest content in roots achieved in plants subjected to phosphate deficiency (267.1 ...
The Lemhi Pass District is "listed as the largest concentration of Thorium resources in the United States", per the U.S. Geological Survey (USGS) and the Idaho Geological Survey (IGS). ... and energy prices), ground conditions, failure of plant, equipment, processes and transportation services to operate as anticipated, …
) = logm (CR,,b~c) - 1.12 x (lsoilPb -I'-0" 174) (3) where l~o~lpb is the logt0 of the required soil 2mPb concentration in Bq/g. Plant~soil concentration ratios of U. Th and Pb 271 RELATIONSHIP OF RESULTS TO BASIC PRINCIPLES The substantial variability of CR values and the lack of consistently reported ancillary data mean that few of the …
The estimated thorium concentrations ranged from 0.003 to 0.192 nCi/m 3 for a period of 1–33 years. ... assessed the frequency of chromosome aberrations in the lymphocytes of 47 male workers in a thorium processing plant. The workers were divided into three groups based on their body burdens of radioactivity: low (0 nCi/kg), moderate (0.003 ...
This interlaboratory study measured thorium concentrations and isotope compositions in uranium ore concentrates from different geographical locations to examine whether thorium …
The concentrations of uranium, thorium, barium, nickel, strontium and lead in the samples of the tailings and plant species collected from a uranium mill tailings repository in South China were analyzed. Then, the removal capability of a plant for a target element was assessed. It was found that Phragmites australis had the greatest removal …
Many nations are exploring new ways to meet their growing energy supply needs, with a particular focus upon methods that produce lower carbon dioxide emissions compared to traditional oil, natural gas, and coal power plants. As a result, thorium-based nuclear power has experienced renewed attention as a potential energy source. Thus, it benefits …
Modern power plants can recover greater than 99.5 percent of the solid combustion wastes. The average ash yield of coal burned in the United States is approximately 10 weight percent. Therefore, the …
INAA using high resolution gamma ray spectrometry could be used to determine thorium concentration in soil and sand samples from different locations around the proposed power plant site of Jaitapur. The average concentration of thorium in the soil and sand samples were 11.4 and 2.6 mg kg −1 respectively. The results are …
Thorium abundance is three times that of uranium in the Earth's crust (Adams and Richardson, 1960; Korna et al., 2014; Asokan et al., 2020), it is usually mined from monazite, a phosphate mineral, although it also occurs in minerals such as thorite or thorianite (Barthel and Tulsidas 2014).Thorium concentrations in the lithosphere range …
An increase of Th content in plants may cause a decrease of concentration of such essential macro-nutrient as calcium and variations in concentrations of many trace elements.
Concentrations of Th and U in soil (one of the main factors affecting plant uptake of the radionuclides) differ significantly depending on the soil type, parent rocks, climate, relief, vegetation season (if we say about rhizosphere soil) and many other factors. Typical concentration range of Th in soils is 2–12 mg kg −1 with an average ...
Thorium Concentrations in Plants: A Review of World Data | Semantic Scholar. DOI: 10.1134/s1062359023110055. Corpus ID: 267278921. Thorium …
4. Conclusions. Wheat seedlings were treated with thorium nitrate solution at two stages of their growth: (1) during germination in water medium, and (2) during growth in soil, after germination. Both treatments resulted in an increase of Th concentration in roots and in seeds. The leaf Th content remained low.
The aim of this work is to discuss some of the factors affecting uptake of uranium and thorium by plants, including relationships between these radionuclides in soil and in plants and temporal changes of uranium and thorium concentrations in different plant species. 2. Materials and methods. The field and greenhouse experiments were …
The thorium concentrations in plants show high variability and vary from 0.5 × 10–5 to 2.8 Bq/kg for soils with normal background and from 0.058 to 80 Bq/kg (dry matter) for areas …
Thorium Concentrations in the Environment: A Review of the Global Data. December 2021. Biology Bulletin 48 (11):2086-2097. DOI: …
changes of uranium and thorium concentrations in different plant species. 2. Materials and methods The field and greenhouse experiments were performed from 2000 to2006 in St.
The average thorium concentration in the Earth's crust is about 5.6 ppm (or 5.6 mg/kg). The concentration of thorium is higher in the upper part of the Earth's crust, …
To model the behavior of thorium in the environment, and to estimate the thorium concentration in biosphere compartments, parameters such as the solid-liquid …
At the Yellow river, China, thorium concentrations in water in the vicinity of the Baotou plant are generally below the detection limit of 0.002 μg/L, but thorium was found to be increased in leachates with about 0.064 μg/L, and it is strongly contaminated with chemicals used for processing at Baotou, which affect fish population and people ...
Uptake of uranium and thorium by native and cultivated plants. Irina Shtangeeva. 2010, Journal of Environmental Radioactivity. See Full PDF Download PDF.
CONCLUSIONS. The 232 Th concentrations in plants vary widely from 0.5 × 10 –4 to 22 Bq/kg for soils with a normal background and from 0.058 to 80 Bq/kg for areas with high thorium concentrations in the soil. The accumulation of thorium in plants …
uptake of uranium and thorium by plants, including relationships. between these radionuclides in soil and in plants and t emporal. changes of uranium and thorium concentrations in different plant ...
Table 1 Mean concentration of uranium-238 (238 U) and thorium-232 (232 Th) in soil samples collected, around various types of medicinal plants Full size table The results for uranium and thorium specific activities in different parts (roots, stems, leaves and seeds/or fruits) of studied medicinal plants are given in Tables 2 and 3, respectively.
The stock solution of thorium (1.0 mmol L −1) was prepared with Th(NO 3) 4 ∙6H 2 O (analytical reagent) and further diluted to the required concentration for further use. 100 mg of CA membrane was suspended in 50 mL of thorium solution, followed by constant shaking in 130 rpm for 24 h at 303, 313 and 323 K, respectively.
The concentrations of thorium and uranium in the analyzed plants from this area were found to be in range from 0.216 to 1.766 μg/g and from 0.114 to 1.308 μg/g, respectively. This is several times higher than was found for the plants collected in a relatively unpolluted area (town of Kurchatov) and in the steppe near Aktau.
A review of the available data on thorium concentrations in plants and related foodstuffs is presented. It is shown that the concentration of 232 Th in plants in regions with normal background radiation varies from 0.5 × 10 -4 to 22.8 Bq/kg, while it reaches 0.058-80.0 Bq/kg (dry weight) in regions with elevated environmental thorium concentrations.
LiF however can carry a higher concentration of uranium than FLiBe, allowing less enrichment. ... with potential for replacing CCGT and coal plants. In the SSR-Th, thorium would be in the coolant salt and the U-233 produced is progressively dissolved in bismuth at the bottom of the salt pool. This contains U-238 to denature it.
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