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Veerasamy N, Sahoo SK, Natarajan T, Inoue K, Fukushi M, Ramola RC. Distribution of naturally occurring radionuclides and gamma dose rate assessment in the soils of high background natural radiation area Odisha, India. RADIATION PROTECTION DOSIMETRY 2023; 199:2194-2198. [PMID: 37934990 DOI: 10.1093/rpd/ncad254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Revised: 07/18/2023] [Accepted: 08/22/2023] [Indexed: 11/09/2023]
Abstract
A study on the activity concentration of primordial radionuclides 226Ra, 232Th and 40K was carried out on the surface soil samples collected from the coastal villages between Chhatrapur and Gopalpur regions of high background natural radiation area Odisha, India, using high purity germanium gamma spectroscopy. The mean activity concentrations of 226Ra, 232Th and 40K were found to be 231, 1692 and 250 Bq/kg, respectively. The total mean absorbed dose owing to the presence of 226Ra, 232Th and 40K was 1139 nGy/h. The mean annual effective dose was found to be 1397 μSv/y and higher than the UNSCEAR average value 70 μSv/y.
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Affiliation(s)
- Nimelan Veerasamy
- Tritium Research Center, Institute for Environmental Sciences, Aomori 039-3121, Japan
- Department of Radiological Sciences, Tokyo Metropolitan University, Arakawa-ku, Tokyo 116-8551, Japan
| | - Sarata K Sahoo
- Institute for Radiological Science, National Institutes for Quantum Science and Technology (QST), 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
| | - Thennaarassan Natarajan
- Department of Radiological Sciences, Tokyo Metropolitan University, Arakawa-ku, Tokyo 116-8551, Japan
- Institute for Radiological Science, National Institutes for Quantum Science and Technology (QST), 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
| | - Kazumasa Inoue
- Department of Radiological Sciences, Tokyo Metropolitan University, Arakawa-ku, Tokyo 116-8551, Japan
| | - Masahiro Fukushi
- Department of Radiological Sciences, Tokyo Metropolitan University, Arakawa-ku, Tokyo 116-8551, Japan
| | - Rakesh C Ramola
- Department of Physics, H.N.B. Garhwal University, Tehri Garhwal, Uttarakhand 249 199, India
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Sakr S, Inoue K, Mohamed A, Ahmed AA, ElFeky MG, Saleh GM, Kamar MS, Arae H, Aono T, Sahoo SK. Distribution of natural radionuclides in NORM samples from North Abu Rusheid area, Egypt. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2023; 266-267:107240. [PMID: 37418811 DOI: 10.1016/j.jenvrad.2023.107240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Revised: 06/08/2023] [Accepted: 06/30/2023] [Indexed: 07/09/2023]
Abstract
The North Abu Rusheid area in Egypt is a well-known high background natural radiation area (HBNRA) due to the existence of naturally occurring radioactive materials (NORMs) in mylonitic rocks. In this study, 27 rock samples were selected for dose estimation studies. 238U and 232Th were measured using inductively coupled plasma mass spectrometry (ICP-MS) and 40K was measured using sodium iodide (thallium) gamma-ray spectroscopy. The ranges of activity concentrations (Bq/kg) of 238U, 232Th and 40K in the samples varied from 270 ± 2 to 2120 ± 29, 350 ± 2 to 1840 ± 27 and 20 ± 2 to 1390 ± 35 with mean values of 980 ± 349, 770 ± 351, and 640 ± 402 Bq/kg, respectively. The radiological hazard parameters were estimated from activity concentrations of 238U, 232Th and 40K and compared to United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR) values. The present study revealed that the hazard parameters were several times higher than the worldwide averages. The U/Th concentration ratio ranged from 0.7 to 3 and could be attributed to the presence of kasolite, uranothorite, zircon, and columbite in mylonitic rocks. From the radiological protection viewpoint, it is necessary to monitor natural radionuclides in these rocks prior to their use in residential and commercial construction materials.
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Affiliation(s)
- S Sakr
- Tokyo Metropolitan University, 7-2-10 Higashiogu, Arakawa-ku, Tokyo, 116-8551, Japan; Department of Physics, Minia University, El-Minia, Egypt; National Institutes for Quantum Sciences and Technology (QST), 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan
| | - K Inoue
- Tokyo Metropolitan University, 7-2-10 Higashiogu, Arakawa-ku, Tokyo, 116-8551, Japan
| | - A Mohamed
- Department of Physics, Minia University, El-Minia, Egypt
| | - A A Ahmed
- Department of Physics, Minia University, El-Minia, Egypt
| | - M G ElFeky
- Nuclear Materials Authority, P.O. Box 530, El Maadi, Cairo, Egypt
| | - G M Saleh
- Nuclear Materials Authority, P.O. Box 530, El Maadi, Cairo, Egypt
| | - M S Kamar
- Nuclear Materials Authority, P.O. Box 530, El Maadi, Cairo, Egypt
| | - H Arae
- National Institutes for Quantum Sciences and Technology (QST), 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan
| | - T Aono
- National Institutes for Quantum Sciences and Technology (QST), 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan
| | - S K Sahoo
- National Institutes for Quantum Sciences and Technology (QST), 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan.
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Veerasamy N, Kasar S, Murugan R, Inoue K, Natarajan T, Chand Ramola R, Fukushi M, Kumar Sahoo S. 234U/ 238U disequilibrium and 235U/ 238U ratios measured using MC-ICP-MS in natural high background radiation area soils to understand the fate of uranium. CHEMOSPHERE 2023; 323:138217. [PMID: 36849023 DOI: 10.1016/j.chemosphere.2023.138217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Revised: 02/11/2023] [Accepted: 02/21/2023] [Indexed: 06/18/2023]
Abstract
The Chhatrapur-Gopalpur coastal area in Odisha, India is a well-known natural high background radiation (HBRA) area due to the abundance of monazite (a thorium bearing radioactive mineral) in beach sands and soils. Recent studies on Chhatrapur-Gopalpur HBRA groundwater have reported high concentrations of uranium and its decay products. Therefore, the soils of the Chhatrapur-Gopalpur HBRA are reasonably suspected as the sources of these high uranium concentrations in groundwater. In this report, first the uranium concentrations in soil samples were measured using inductively coupled plasma mass spectrometry (ICP-MS) and they were found to range from 0.61 ± 0.01 to 38.59 ± 0.16 mg kg-1. Next, the 234U/238U and 235U/238U isotope ratios were measured to establish a baseline for the first time in Chhatrapur-Gopalpur HBRA soil. Multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) was used for measurement of these isotope ratios. The 235U/238U ratio was observed to be the normal terrestrial value. The 234U/238U activity ratio, was calculated to understand the secular equilibrium between 234U and 238U in soil and it varied from 0.959 to 1.070. To understand the dynamics of uranium in HBRA soil, physico-chemical characteristics of soil were correlated with uranium isotope ratios and this correlation of 234U/238U activity ratio indicated the leaching of 234U from Odisha HBRA soil.
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Affiliation(s)
- Nimelan Veerasamy
- Tokyo Metropolitan University, 7-2-10 Higashiogu, Arakawa-ku, Tokyo, 116-8551, Japan; National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan
| | - Sharayu Kasar
- National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan
| | - Rajamanickam Murugan
- National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan
| | - Kazumasa Inoue
- Tokyo Metropolitan University, 7-2-10 Higashiogu, Arakawa-ku, Tokyo, 116-8551, Japan
| | - Thennaarassan Natarajan
- Tokyo Metropolitan University, 7-2-10 Higashiogu, Arakawa-ku, Tokyo, 116-8551, Japan; National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan
| | - Rakesh Chand Ramola
- H.N.B. Garhwal University, Badshahi Thaul Campus, Tehri Garhwal, 249 199, India
| | - Masahiro Fukushi
- Tokyo Metropolitan University, 7-2-10 Higashiogu, Arakawa-ku, Tokyo, 116-8551, Japan
| | - Sarata Kumar Sahoo
- National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan.
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Ilori AO, Chetty N. Activity concentrations and radiological hazard assessments of 226Ra, 232Th, and 40K in soil samples of oil-producing areas of South Africa. INTERNATIONAL JOURNAL OF ENVIRONMENTAL HEALTH RESEARCH 2022; 32:2665-2677. [PMID: 34601976 DOI: 10.1080/09603123.2021.1984399] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Accepted: 09/19/2021] [Indexed: 06/13/2023]
Abstract
The specific activity of natural radionuclide in soil samples of the oil-producing areas of South Africa was measured using a High Purity Germanium detector. The activity of226Ra, 232Th, and 40K in the soil range from 16.5 ± 1.3 to 64.9 ± 3.1, 16.8 ± 1.5 to 88.6 ± 1.2, 135.2 ± 17.5 to 604.8 ± 13.4 Bqkg-1 for Mossel Bay; 14.3 ± 1.2 to 48.9 ± 8.2, 22.3 ± 1.4 to 45.1 ± 3.2, 237.7 ± 10.9 to 486.5 ± 40.1 Bqkg-1 for Cape Town; 10.5 ± 1.1 to 25.8 ± 3.2, 13.1 ± 1.9 to 44.3 ± 5.2, 140.2 ± 10.9 to 229.8 ± 12.8 Bqkg-1 for Nelson Mandela Bay and 5.6 ± 2.2 to 13.1 ± 2.9, 4.5 ± 2.5 to 14.1 ± 2.7, 62.7 ± 22.6 to 126.5 ± 21.2 Bqkg-1 for Msunduzi. Most soil samples' radiological hazards were within the world average.
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Affiliation(s)
- Abiola Olawale Ilori
- School of Chemistry and Physics, University of KwaZulu-Natal, Pietermaritzburg, South Africa
| | - Naven Chetty
- School of Chemistry and Physics, University of KwaZulu-Natal, Pietermaritzburg, South Africa
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Abedin MJ, Khan R. Primordial radionuclides in the dust samples from the educational institutions of central Bangladesh: radiological risk assessment. Heliyon 2022; 8:e11446. [DOI: 10.1016/j.heliyon.2022.e11446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Revised: 08/13/2022] [Accepted: 11/01/2022] [Indexed: 11/09/2022] Open
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Suresh S, Rangaswamy DR, Sannappa J, Dongre S, Srinivasa E, Rajesh S. Estimation of natural radioactivity and assessment of radiation hazard indices in soil samples of Uttara Kannada district, Karnataka, India. J Radioanal Nucl Chem 2022. [DOI: 10.1007/s10967-021-08145-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Veerasamy N, Sahoo SK, Murugan R, Kasar S, Inoue K, Fukushi M, Natarajan T. ICP-MS Measurement of Trace and Rare Earth Elements in Beach Placer-Deposit Soils of Odisha, East Coast of India, to Estimate Natural Enhancement of Elements in the Environment. Molecules 2021; 26:molecules26247510. [PMID: 34946589 PMCID: PMC8708771 DOI: 10.3390/molecules26247510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Revised: 12/07/2021] [Accepted: 12/08/2021] [Indexed: 11/25/2022] Open
Abstract
Inductively coupled plasma mass spectrometry (ICP-MS) has been used to measure the concentration of trace and rare earth elements (REEs) in soils. Geochemical certified reference materials such as JLk-1, JB-1, and JB-3 were used for the validation of the analytical method. The measured values were in good agreement with the certified values for all the elements and were within 10% analytical error. Beach placer deposits of soils mainly from Odisha, on the east coast of India, have been selected to study selected trace and rare earth elements (REEs), to estimate enrichment factor (EF) and geoaccumulation index (Igeo) in the natural environment. Enrichment factor (EF) and geoaccumulation index (Igeo) results showed that Cr, Mn, Fe, Co, Zn, Y, Zr, Cd and U were significantly enriched, and Th was extremely enriched. The total content of REEs (ƩREEs) ranged from 101.3 to 12,911.3 µg g−1, with an average 2431.1 µg g−1 which was higher than the average crustal value of ΣREEs. A high concentration of Th and light REEs were strongly correlated, which confirmed soil enrichment with monazite minerals. High ratios of light REEs (LREEs)/heavy REEs (HREEs) with a strong negative Eu anomaly revealed a felsic origin. The comparison of the chondrite normalized REE patterns of soil with hinterland rocks such as granite, charnockite, khondalite and migmatite suggested that enhancement of trace and REEs are of natural origin.
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Affiliation(s)
- Nimelan Veerasamy
- National Institute of Radiological Sciences, National Institutes for Quantum Sciences and Technology (QST), 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan; (N.V.); (R.M.); (S.K.); (T.N.)
- Department of Radiological Sciences, Tokyo Metropolitan University, 7-2-10 Higashiogu, Arakawa-ku, Tokyo 116-8551, Japan; (K.I.); (M.F.)
| | - Sarata Kumar Sahoo
- National Institute of Radiological Sciences, National Institutes for Quantum Sciences and Technology (QST), 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan; (N.V.); (R.M.); (S.K.); (T.N.)
- Correspondence:
| | - Rajamanickam Murugan
- National Institute of Radiological Sciences, National Institutes for Quantum Sciences and Technology (QST), 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan; (N.V.); (R.M.); (S.K.); (T.N.)
| | - Sharayu Kasar
- National Institute of Radiological Sciences, National Institutes for Quantum Sciences and Technology (QST), 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan; (N.V.); (R.M.); (S.K.); (T.N.)
| | - Kazumasa Inoue
- Department of Radiological Sciences, Tokyo Metropolitan University, 7-2-10 Higashiogu, Arakawa-ku, Tokyo 116-8551, Japan; (K.I.); (M.F.)
| | - Masahiro Fukushi
- Department of Radiological Sciences, Tokyo Metropolitan University, 7-2-10 Higashiogu, Arakawa-ku, Tokyo 116-8551, Japan; (K.I.); (M.F.)
| | - Thennaarassan Natarajan
- National Institute of Radiological Sciences, National Institutes for Quantum Sciences and Technology (QST), 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan; (N.V.); (R.M.); (S.K.); (T.N.)
- Department of Radiological Sciences, Tokyo Metropolitan University, 7-2-10 Higashiogu, Arakawa-ku, Tokyo 116-8551, Japan; (K.I.); (M.F.)
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Veerasamy N, Murugan R, Kasar S, Inoue K, Kavasi N, Balakrishnan S, Arae H, Fukushi M, Sahoo SK. Geochemical characterization of monazite sands based on rare earth elements, thorium and uranium from a natural high background radiation area in Tamil Nadu, India. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2021; 232:106565. [PMID: 33714078 DOI: 10.1016/j.jenvrad.2021.106565] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Revised: 02/17/2021] [Accepted: 02/17/2021] [Indexed: 06/12/2023]
Abstract
The Kanyakumari coastal area in the southernmost part of Tamil Nadu, India is a well-known natural high background radiation area due to the abundance of monazite in beach placer deposits. In the present study, the concentrations of major oxides, rare earth elements (REEs), Th and U were measured to understand geochemical characteristics of these monazite sands. Based on the ambient dose rate, 23 locations covering an area of about 60 km along the coast were selected for sample collection. The concentrations of U and Th ranged from 1.1 to 737.8 μg g-1 and 25.2-12250.6 μg g-1, respectively. The Th/U ratio ranged from 2.2 to 61.6, which clearly indicated that Th was the dominant contributing radionuclide to the enhanced natural radioactivity in this coastal region. The chondrite-normalized REEs pattern of the placer deposits showed enrichment in light REEs and depletion in heavy REEs with a negative Eu anomaly that indicated the monazite sands were derived from granite, charnockite, and granitoid rocks from the Nagercoil and the Trivandrum Blocks of the Southern Granulite Terrain.
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Affiliation(s)
- N Veerasamy
- Department of Radiological Sciences, Tokyo Metropolitan University, 7-2-10 Higashiogu, Arakawa-ku, Tokyo, 116-8551, Japan; Environmental Radionuclides Research Group, National Institutes for Quantum and Radiological Sciences and Technology, 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan
| | - R Murugan
- Environmental Radionuclides Research Group, National Institutes for Quantum and Radiological Sciences and Technology, 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan
| | - S Kasar
- Environmental Radionuclides Research Group, National Institutes for Quantum and Radiological Sciences and Technology, 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan
| | - K Inoue
- Department of Radiological Sciences, Tokyo Metropolitan University, 7-2-10 Higashiogu, Arakawa-ku, Tokyo, 116-8551, Japan
| | - N Kavasi
- Environmental Radionuclides Research Group, National Institutes for Quantum and Radiological Sciences and Technology, 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan
| | - S Balakrishnan
- Department of Earth Sciences, Pondicherry University, R Venkat Raman Nagar, Kalapet, Puducherry, 605014, India
| | - H Arae
- Environmental Radionuclides Research Group, National Institutes for Quantum and Radiological Sciences and Technology, 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan
| | - M Fukushi
- Department of Radiological Sciences, Tokyo Metropolitan University, 7-2-10 Higashiogu, Arakawa-ku, Tokyo, 116-8551, Japan
| | - S K Sahoo
- Environmental Radionuclides Research Group, National Institutes for Quantum and Radiological Sciences and Technology, 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan.
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Veerasamy N, Sahoo SK, Inoue K, Arae H, Fukushi M. Geochemical behavior of uranium and thorium in sand and sandy soil samples from a natural high background radiation area of the Odisha coast, India. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:31339-31349. [PMID: 32483717 DOI: 10.1007/s11356-020-09370-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Accepted: 05/19/2020] [Indexed: 06/11/2023]
Abstract
Owing to their natural radioactivity, uranium (U) and thorium (Th) play significant roles in environmental sciences for monitoring radiation dose and in geological sciences for understanding sedimentary processes. The Odisha coastal area, in eastern India, is a well-known high background radiation area that is rich in monazites and rutile. This area was selected to study geochemical characteristics of U and Th in sand and sandy soil samples. The concentrations of U and Th were measured using inductively coupled plasma mass spectrometry (ICP-MS). The median, geometric mean, and standard deviation for U were determined to be 6, 4.5, and 2.5 μg/g and for Th were 186, 123.3, and 3.1 μg/g, respectively. Major element concentrations were evaluated using X-ray fluorescence spectroscopy to get the mineralogical composition and state of chemical weathering. The ratios of Th/U and Th/K varied from 4 to 37 and from 13 to 1058, respectively. These results clearly indicate that the samples from the coastal region were formed in an oxidizing and intense chemical weathering terrestrial environment with an enrichment of radiogenic heavy minerals (monazites and zircon) and clay mineral association. Since the majority of the samples have undergone moderate to intense weathering in the oxidizing environment, U is leached from the soil and sand matrix. Eventually, Th resides in the matrix and becomes a major source for radiation exposure in the environment. The high ratios of Th/U, along with the strong positive correlation between Th and P2O5, evidence the enrichment of the Th-bearing radioactive mineral, monazite, in these samples.
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Affiliation(s)
- Nimelan Veerasamy
- Department of Radiological Sciences, Tokyo Metropolitan University, 7-2-10 Higashiogu, Arakawa-ku, Tokyo, 116-8551, Japan
- Environmental Radionuclides Research Group, National Institutes for Quantum and Radiological Sciences and Technology (QST), 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan
| | - Sarata Kumar Sahoo
- Environmental Radionuclides Research Group, National Institutes for Quantum and Radiological Sciences and Technology (QST), 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan.
| | - Kazumasa Inoue
- Department of Radiological Sciences, Tokyo Metropolitan University, 7-2-10 Higashiogu, Arakawa-ku, Tokyo, 116-8551, Japan
| | - Hideki Arae
- Environmental Radionuclides Research Group, National Institutes for Quantum and Radiological Sciences and Technology (QST), 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan
| | - Masahiro Fukushi
- Department of Radiological Sciences, Tokyo Metropolitan University, 7-2-10 Higashiogu, Arakawa-ku, Tokyo, 116-8551, Japan
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Chemical Separation of Uranium and Precise Measurement of 234U/ 238U and 235U/ 238U Ratios in Soil Samples Using Multi Collector Inductively Coupled Plasma Mass Spectrometry. Molecules 2020; 25:molecules25092138. [PMID: 32375226 PMCID: PMC7249105 DOI: 10.3390/molecules25092138] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Revised: 04/17/2020] [Accepted: 04/29/2020] [Indexed: 11/16/2022] Open
Abstract
A new chemical separation has been developed to isolate uranium (U) using two UTEVA columns to minimize iron and thorium interferences from high background area soil samples containing minerals like monazites and ilmenite. The separation method was successfully verified in some certified reference materials (CRMs), for example, JSd-2, JLk-1, JB-1 and JB-3. The same method was applied for purification of U in Fukushima soil samples affected by the Fukushima dai-ichi nuclear power station (FDNPS) accident. Precise and accurate measurement of 234U/238U and 235U/238U isotope ratios in chemically separated U were carried out using a multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS). In this mass spectrometric method, an array of two Faraday cups (1011 Ω, 1012 Ω resistor) and a Daly detector were simultaneously employed. The precision of U isotope ratios in an in-house standard was evaluated by replicate measurement. Relative standard deviation (RSD) of 234U/238U and 235U/238U were found to be 0.094% (2σ) and 0.590% (2σ), respectively. This method has been validated using a standard reference material SRM 4350B, sediment sample. The replicate measurements of 234U/238U in SRM shows 0.7% (RSD). This developed method is suitable for separation of U and its isotope ratio measurement in environmental samples.
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Veerasamy N, Sahoo SK, Inoue K, Fukushi M, Tsuruoka H, Arae H, Balakrishnan S. NATURAL RADIOACTIVITY MEASUREMENT AND DOSE ASSESSMENT OF BEACH PLACER SANDS IN THE COASTAL REGION OF TAMIL NADU (INDIA). RADIATION PROTECTION DOSIMETRY 2019; 184:409-412. [PMID: 31038715 DOI: 10.1093/rpd/ncz109] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
A preliminary study was carried out to determine the radioactivity concentration of 232Th, 226Ra and 40K in beach placer sands from 13 locations along the coast line of Tamil Nadu state, India. The ambient dose rates varied from 9 to 467 nGy h-1. The activity concentrations of radionuclide 232Th, 226Ra and 40K ranged from 5.2 to 683 Bq kg-1, 13 to 198 Bq kg-1 and 107 to 421 Bq kg-1, respectively. The annual effective dose rate ranges from 27 to 620 μSv y-1 and was higher at seven beaches in comparison to the UNSCEAR annual worldwide average value.
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Affiliation(s)
- N Veerasamy
- National Institutes for Quantum and Radiological Science and Technology (QST), Chiba, Japan
- Tokyo Metropolitan University, Tokyo, Japan
| | - S K Sahoo
- National Institutes for Quantum and Radiological Science and Technology (QST), Chiba, Japan
| | - K Inoue
- Tokyo Metropolitan University, Tokyo, Japan
| | - M Fukushi
- Tokyo Metropolitan University, Tokyo, Japan
| | - H Tsuruoka
- Tokyo Metropolitan University, Tokyo, Japan
- Tsukuba International University, Ibaraki, Japan
| | - H Arae
- National Institutes for Quantum and Radiological Science and Technology (QST), Chiba, Japan
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Kasar S, Sahoo SK, Arae H, Mishra S, Tokonami S, Aono T. URANIUM, THORIUM AND RARE EARTH ELEMENTS DISTRIBUTION IN FUKUSHIMA SOIL SAMPLES. RADIATION PROTECTION DOSIMETRY 2019; 184:363-367. [PMID: 31330003 DOI: 10.1093/rpd/ncz075] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Accepted: 04/03/2019] [Indexed: 06/10/2023]
Abstract
Uranium, thorium and rare earth elements (REEs) in soil samples contaminated by Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident was determined using inductively coupled plasma-mass spectrometry (ICP-MS). This information provides knowledge about concentration levels of REEs in soil samples as a background data after FDNPP accident. Chondrite-normalised REEs pattern does not show enrichment in concentrations of REEs, which could be related to FDNPP accident. The high concentration of these elements at few sampling points may be due to soil formation process from granitic rocks.
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Affiliation(s)
- S Kasar
- National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - S K Sahoo
- National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - H Arae
- National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - S Mishra
- National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
- Bhabha Atomic Research Centre, Trombay, Mumbai, India
| | - S Tokonami
- Institute of Radiation Emergency Medicine, Hirosaki University, Aomori, Japan
| | - T Aono
- National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
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Bramha S, Sahoo SK, Subramanian V, Venkatraman B, Rath P. Application of multivariate technique to evaluate spatial distribution of natural radionuclides along Tamil Nadu coastline, east coast of India. SN APPLIED SCIENCES 2019. [DOI: 10.1007/s42452-019-0716-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
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