The influence of different hydroponic conditions on thorium …
The effects of different hydroponic conditions (such as concentration of thorium (Th), pH, carbonate, phosphate, organic acids, and cations) on thorium uptake by Brassica juncea var. foliosa were evaluated. The results showed that acidic cultivation solutions enhanced thorium accumulation in the plants. Phosphate and carbonate …
Thorium Concentrations in Plants: A Review of World …
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
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 ...
Thorium Concentrations in Plants: A Review of World Data
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.
Relationship between concentration of rare earth elements …
It is known that a low concentration of REEs in soil is usually related to plant growth stimulation, while high concentrations have a negative influence for both plant growth and phytoextraction of trace elements (Zhang et al. 2013), but there are limited data about the influence of all 17 REEs to plant response (de Oliveira et al. 2015), which ...
Thorium as an environment stressor for growth of Nicotiana glutinosa plants
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 …
CHAPTER 5. POTENTIAL FOR HUMAN EXPOSURE
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 as an environment stressor for growth of …
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 …
Idaho Strategic Resources Adds the Lemhi Pass Project – The …
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, …
(PDF) Radium, uranium and thorium concentrations in low …
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 ...
Estimation of activity concentrations of radionuclides and
In-situ assessment of natural terrestrial-radioactivity from Uranium-238 (238U), Thorium-232 (232Th) and Potassium-40 (40K) in coastal urban-environment and its possible health implications
Thorium, uranium and rare earth elements content in …
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 …
Thorium Concentrations in the Environment: A Review of
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 ...
Thorium Concentrations in Plants: A Review of World Data
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 ...
Thorium uptake by wheat at different stages of plant growth
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.
Phytoextraction of Thorium from Soil and Water Media
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 ...
Screening of Plant Species for Phytoremediation of Uranium, 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 …
Uptake of uranium and thorium by native and cultivated 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 ...
Radionuclide Basics: Thorium | Radiation Protection | US EPA
Natural thorium is present in trace quantities in virtually all rock, soil, water, plants and animals. Where higher concentrations occur in rock or sands, thorium may be mined and refined, producing waste products such as mill tailings. If not properly controlled, wind and water can introduce the tailings into the wider environment.
Thorium Concentrations in Plants: A Review of World …
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 …
Critical compilation and review of plant/soil concentration ratios for
) = 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 …
Thorium Concentrations in the Environment: A …
Thorium Concentrations in the Environment: A Review of the Global Data. December 2021. Biology Bulletin 48 (11):2086-2097. DOI: 10.1134/S1062359021110030. …
Uptake of uranium and thorium by native and cultivated plants
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 …
Nature, Sources, Resources, and Production of Thorium
Abstract. Thorium is a naturally occurring, slightly radioactive element. It is widely distributed in nature with an average concentration of 10.5 ppm Th in the upper …
Fate and Environmental Impact of Thorium Residues During …
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 ...
Assessment of concentration of radium, thorium, and
The study assessed natural radioactivity in Rohtak and Jind districts, Haryana, India. Concentrations of radionuclides in soil and building materials were measured using gamma-ray spectroscopy. The "Canister Technique" was employed to estimate radon mass exhalation and surface exhalation rates. Results showed low radiation doses from soil …
Radionuclide tolerance mechanism of plants for …
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 ...
Nature, Sources, Resources, and Production of Thorium
Thorium is a naturally occurring, slightly radioactive element. It is widely distributed in nature with an average concentration of 10.5 ppm Th in the upper earth's crust. In general, thorium occurs in relatively small number in Th-enriched minerals: thorite, thorianite, monazite, bastnaesite, and thorogummite. However, the main world resources …
The concentration of rare earth elements in plants and in …
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 …
Thorium Concentrations in Plants: A Review of World …
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 …