concentration plants thorium

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 ...

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 …

Soil-to-plant transfer factor (TF) is one of the most important parameters to be used in transfer models for predicting the concentration of radionuclides in agricultural crops and for estimating dose impacts to man.

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 ...

However, plants grown at the edge of impoundments of uranium tailings containing elevated levels of thorium had a plant/soil concentration ratio of about 3 (Ibrahim and …

Download Citation | On Jan 26, 2024, S. V. Fesenko and others published Thorium Concentrations in Plants: A Review of World Data | Find, read and cite all the research …

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, …

Thus a coal power plant can conceptually fuel 13 thorium plants of its own power. From a different perspective, 1 pound of Th has the energy equivalent of 5,000 tons of coal. There are 31 pounds of Th in 5,000 tons of coal. ... It occurs in secular equilibrium in the decay chain of natural uranium at a concentration of 17 ppm.

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 …

Addition of a small amount of thorium to the media resulted in a significant increase of thorium concentration both in roots and leaves of the wheat seedlings. The uptake of Th by roots depended of the media where the plants grew: it was more significant in water-grown plants. ... Among other radio-nuclides, limited information is available on ...

Thorium concentration from 0.002 to 0.012 mg g −1 of DW was found in the leaves, and the plant flower concentration was at the detection limit (Fig. 1 B). In the above-ground parts, the concentration was influenced by the type of medium (presence or absence of phosphates) and putrescine spraying. Download : Download high-res image …

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.

In the present work, we study the linearity assumption for isotopes of natural uranium (234 U and 238 U), thorium (232 Th, 230 Th and 228 Th) and radium (226 Ra), as well as the dependence of TF values on the stable element concentrations in substrates and plants, specifically from granitic and alluvial soils to pasture located in an area that ...

The concentrations of Th and U in LC and WLP samples determined by γ- spectrometry were 1156 ppm (4728 ± 22 ... thorium isotopes and small amount of natural uranium generated from the operation of a thorium pilot plant for purification and production of pure thorium nitrate at IPEN -CNEN/SP. The paper presents preliminary …

This concentration is assumed to be the same as the Orissa Sands Complex in India. 13 Mt. Weld has high estimated costs due to the low grade of thorium in the rare earth separation plant feed (40% REO, 0.13–0.16% ThO2). While the Araxá deposit has a 0.10% grade of thorium in situ, the processing plan for the proposed mine does not …

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.

Thorium concentration from 0.002 to 0.012 mg g −1 of DW was found in the leaves, and the plant flower concentration was at the detection limit (Fig. 1 B). In the …

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 extraordinary coordination ability of plant polyphenols makes it possible to selectively extract low content of Th 4+ out of the radioactive wastewater containing high concentration of co-existing ions even the total concentration of co-existing ions is hundreds of folds higher than that of Th 4+.(Serrano et al., 2009; Pérez-Manríquez et ...

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 …

La, Ce, Nd, Sm, Eu, Tb, Yb and Lu were determined in needles of age class 5 from 6 individual Norway spruce trees and in their soils. Measurements were done by neutron activation analysis with a group separation of the REE. Concentrations in spruce needles are among the lowest values reported for plant leaves. Concentrations show …

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.

At low thorium concentrations, unoccupied adsorption sites existed on the PZ surface, but as the initial concentration increased, the adsorption sites became occupied and disappeared 55.

not bioconcentrate in plants from soil. However, plants grown at the edge of impoundments of uranium tailings containing elevated levels of thorium had a plant/soil concentration ratio of about 3 (Ibrahim and Whicker 1988). The atmospheric mass concentration of thorium ranged from 0.2 to 1.0 ng/m 3, with a mean value of

Thorium concentrations in coal fall within a similar 1–4 ppm range, compared to an average crustal abundance of approximately 10 ppm. Coals with more than 20 ppm thorium are extremely rare. During coal combustion most of the uranium, thorium, and their decay products are released from the original coal matrix and are distributed between the ...

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.

Uranium and thorium concentrations in plants were lower after rainfall. Incorporation of uranium into the plants seemed to be mainly from water, whereas incorporation of thorium seemed to be from ...

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 …

Taking into account the relevant figures, the following remarks can be made: (1) 238U and z~ZI'h concentrations are either not detectable or very low; in the second case, they were found in the collection and separation plants; (2) 226Ra concentration is higher in oil extraction plant scales (800+3000 Bg/kg) than in other plants (300+400 Bg/kg ...

Plants and soils from a natural thorium and rare-earth element occurrence (Morro do Ferro, Brazil) were analyzed by alpha spectrometry (Th) and ICP-AES (REE), after pre-concentration of the ...

In most cases main source of thorium for its trans-fer into plants is the soil [1]. Fallout of radionuclides from the atmosphere and subsequent surface contam-ination of plants are also of great importance and can significantly affect the thorium concentrations in veg-etation [2, 3]. Other sources of plant contamination, such as irrigation, may ...

Thorium Concentrations in the Environment: A Review of the Global Data. December 2021. Biology Bulletin 48 (11):2086-2097. DOI: 10.1134/S1062359021110030. …