Concentrating on thorium - 2020 - Wiley Analytical Science
2020年8月17日 Up to now, determining the concentration of thorium-230 in uranium-rich materials has involved a combination of some form of chromatography, to separate the thorium from the uranium, and
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Exploring the use of thorium isotope compositions and
2021年1月25日 This interlaboratory study measured thorium concentrations and isotope compositions in uranium ore concentrates from different geographical locations to ex
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Thorium Concentrations in the Environment: A Review of the
2022年1月16日 The thorium concentrations in surface waters are rather low in regions with a normal radiation background, varying from 1.0 × 10 –5 to 1.0 × 10 –1 Bq/L. Higher
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Radionuclide Basics: Thorium US EPA
2023年2月15日 Radionuclide Basics: Thorium. Thorium (chemical symbol Th) is a naturally occurring radioactive metal found at trace levels in
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Occurrence of thorium - Wikipedia
Present knowledge of the distribution of thorium resources is poor because of the relatively low-key exploration efforts arising out of insignificant demand. There are two sets of estimates that define world thorium reserves, one set by the United States Geological Survey (USGS) and the other supported by reports from the OECD and the International Atomic Energy Agency (the IAEA). Unde
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Separation of thorium from uranium ore SpringerLink
2019年12月7日 Thorium-230, historically known as ionium, is part of the 238 U decay chain (see Fig. 1 ). There are many research areas today where this isotope is relevant.
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Estimation of activity concentrations of radionuclides and ... - Nature
2022年2月8日 In-situ assessment of natural terrestrial-radioactivity from Uranium-238 (238U), Thorium-232 (232Th) and Potassium-40 (40K) in coastal urban-environment
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Determination of uranium and thorium concentrations in
2021年6月1日 Determination of uranium and thorium concentrations in sediment samples by using solid state nuclear track detectors Pelin Otansev a , Nizamettin
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Determination of uranium and thorium concentrations in
The mean thorium concentrations in boreholes S3 and S8 were found to be 15.26 μg/g (9.60-17.49 μg/g) and 15.76 μg/g (13.89-17.37 μg/g), respectively. The highest thorium
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Age dependence of natural uranium and thorium concentrations
The thorium concentration differed only marginally with respect to age group, indicating that its behavior in the body could be age-independent. Conversely, the uranium level in
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Uranium Supplies: Supply of Uranium - World
Table 1: Typical natural uranium concentrations. Very high-grade ore (Canada) – 20% U: 200,000 ppm U: High-grade ore – 2% U: 20,000 ppm U: Low-grade ore – 0.1% U: ... for which the government granted a permit
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Evaluation of elemental concentrations of uranium, thorium
2019年9月1日 Evaluation of elemental concentrations of uranium, thorium and potassium in top soils from Kuwait - ScienceDirect. Nuclear Engineering and Technology. Volume 51, Issue 6, September 2019, Pages 1638-1649. Original Article. Evaluation of elemental concentrations of uranium, thorium and potassium in top soils from Kuwait.
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Estimation of activity concentrations of radionuclides and
2022年2月8日 The activity concentrations of 226 Ra, 232 Th and 40 K were revealed to be 12.66 ± 0.76–42.33 ± 1.37, 44.96 ± 1.41–128.70 ± 1.56, 31.30 ± 1.18–453.85 ± 2.43 Bq kg −1 respectively. The mean value...
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Separation of thorium, uranium, and rare earths from a strip
2020年11月1日 Among all the tests conducted, the best separation performance was achieved using a one-stage precipitation at a pH value of 4.8, 50 v% TBP, solvent extraction feed pH of 3.5, and an O/A ratio of 3, which corresponded to an overall rare earth, thorium, and uranium recovery of 79.6%, 0%, and 3.1%, respectively. Previous articlein issue.
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Determination of uranium and thorium concentrations in
In this study, uranium and thorium concentrations in the sediment samples collected from the Gulf of Izmit in Marmara Sea were determined using neutron radiography method and alpha-autoradiography method. Mean uranium concentrations calculated for the sediment samples collected from the boreholes S2
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Concentration measurements of uranium, thorium and their
2014年9月27日 Article. Published: 27 September 2014. Concentration measurements of uranium, thorium and their daughter products in water produced from and near oil fields in north of Iraq using SSNTRD’s passive method. Ammir H. Ali, Ahmed K. Mheemeed Hana I. Hassan. Journal of Radioanalytical and Nuclear Chemistry 303 , 959–965 ( 2015) Cite
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Determination for levels of uranium and thorium in water
2017年7月1日 The global average concentration of Uranium in river water is about 0.3μg.L −1 ( Langmuir, 1978, Palmer and Edmond, 1993 ). The World Health Organization (WHO) guidelines propose a limit of 2μg U/L for drinking water ( WHO, 1996).
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Determination of the elemental concentration of uranium and
2017年1月6日 The highest values of uranium and thorium concentrations (4053 ± 428 ppm and 33578 ± 873 ppm, respectively) were observed in xenotime and monazite; whereas the lowest value was 5.48 ± 0.86 ppm of uranium recorded in waste (sand) and 9 ± 0.32 ppm of thorium for waste (sand) and pyrite. Topics.
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Distribution of rare earth elements, thorium and uranium in
2014年8月28日 Th concentrations (0.9–28 μg/g) are relatively higher than those of uranium (0.4–4.0 μg/g). Th/U ratios (1.5–9.9) are higher than the average upper crust. These results are consistent with terrigenous sediments that formed from the weathering and erosion of felsic rocks. Introduction.
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DETERMINATION OF URANIUM AND THORIUM ACTIVITY
When irradiating a sample with a natural uranium isotopic composition, the number of fission and, consequently, the number of fission-delayed neutrons is proportional to the amount of uranium in the sample. Therefore, the uranium total concentration is calculated basing on the 235U count. The linear regression is used for the calculations.
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Uranium Supplies: Supply of Uranium - World Nuclear
The total recoverable identified resources to $260/kg U is 7.918 million tonnes U. Historical uranium production Uranium has been successfully mined since the 1940s. Historical uranium production is generally well
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Evaluation of elemental concentrations of uranium, thorium
2019年9月1日 Results of elemental concentration ranges from 0.48 to 2.61 mg/kg, 0.87–5.23 mg/kg, and 0.24–2.23%, with a mean values of 1.39 mg/kg, 3.47 mg/kg, and 1.18%, for the Th and and The highest K are 1.1 (%) and 1.27 (%) and is prevalent in and Th/ K/ Th/ Keywords Gamma-ray spectrometry NORM Radioactivity concentration
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Thorium - World Nuclear Association
Thorium is more abundant in nature than uranium. It is fertile rather than fissile, and can only be used as a fuel in conjunction with a fissile material such as recycled plutonium. Thorium fuels can breed fissile uranium
MoreEstimation of activity concentrations of radionuclides and
2022年2月8日 The activity concentrations of 226 Ra, 232 Th and 40 K were revealed to be 12.66 ± 0.76–42.33 ± 1.37, 44.96 ± 1.41–128.70 ± 1.56, 31.30 ± 1.18–453.85 ± 2.43 Bq kg −1 respectively. The mean value...
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Occurrence of uranium, thorium and rare earth
2023年1月4日 Uranium, thorium, and rare earth elements (REEs) are important strategic elements in today’s world with a range of applications in high and green technology and power generation. The expected
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Ultra-effective modified clinoptilolite adsorbent for selective thorium
2023年6月8日 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.
MoreDetermination of uranium and thorium concentrations in
In this study, uranium and thorium concentrations in the sediment samples collected from the Gulf of Izmit in Marmara Sea were determined using neutron radiography method and alpha-autoradiography method. Mean uranium concentrations calculated for the sediment samples collected from the boreholes S2
MoreDetermination for levels of uranium and thorium in water
2017年7月1日 The global average concentration of Uranium in river water is about 0.3μg.L −1 ( Langmuir, 1978, Palmer and Edmond, 1993 ). The World Health Organization (WHO) guidelines propose a limit of 2μg U/L for drinking water ( WHO, 1996).
More
DETERMINATION OF URANIUM AND THORIUM ACTIVITY CONCENTRATIONS
When irradiating a sample with a natural uranium isotopic composition, the number of fission and, consequently, the number of fission-delayed neutrons is proportional to the amount of uranium in the sample. Therefore, the uranium total concentration is calculated basing on the 235U count. The linear regression is used for the calculations.
More
Age dependence of natural uranium and thorium concentrations
The age dependence of the natural concentration of uranium and thorium in the skeleton was investigated using human vertebrae bone collected from two Canadian locations (Winnipeg, Manitoba, and Regina, Saskatchewan).
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