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Accurate and precise determination of 90Sr at femtogram level in IAEA proficiency test using Thermal Ionization Mass Spectrometry. Sci Rep 2019; 9:16532. [PMID: 31712653 PMCID: PMC6848187 DOI: 10.1038/s41598-019-52890-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Accepted: 10/24/2019] [Indexed: 11/08/2022] Open
Abstract
A novel method for the determination of ultra-trace level 90Sr has been recently developed applying thermal ionization mass spectrometry (TIMS). The method includes the chemical separation of Zr (isobaric interference of 90Zr) from the samples followed by determination of 90Sr/88Sr abundance sensitivity (2.1 × 10−10). The analytical performance of this method was assessed in the IAEA-TEL 2017-3 worldwide open proficiency test. For 90Sr determination, tap water and milk powder samples were distributed amongst the participant laboratories with reference values of 11.2 ± 0.3 Bq kg−1 (2.2 ± 0.1 fg g−1) and 99.9 ± 5.0 Bq kg−1 (19.5 ± 1.0 fg g−1), respectively. The stable Sr concentrations were 39.4 ± 0.9 ng g−1 and 2.5 ± 0.1 µg g−1 while the 90Sr/88Sr isotope ratios were 6.47 ± 0.17 × 10−8 and 9.04 ± 0.45 × 10−9 in the tap water and milk powder samples, respectively. For TIMS measurement, 50 mL water and 1 g milk powder samples were taken for analysis. This TIMS method demonstrated an impressive accuracy (relative bias of 4.2% and −2.1%, respectively) and precision (relative combined uncertainty of 4.1% and 7.6%, respectively) when compared with radiometric techniques. For the first time in the history of inorganic mass-spectrometry, 90Sr analysis using a TIMS instrument is confirmed by an independent proficiency test.
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Kavasi N, Sahoo SK. Method for 90Sr Analysis in Environmental Samples Using Thermal Ionization Mass Spectrometry with Daly Ion-Counting System. Anal Chem 2019; 91:2964-2969. [PMID: 30701955 DOI: 10.1021/acs.analchem.8b05184] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In this work, a new 90Sr analysis method was developed using the Isotopx Ltd., Phoenix X62 thermal ionization mass spectrometer (TIMS). Excellent ion beam sensitivity was demonstrated with the detection of 1 mBq (0.2 fg) 90Sr on a Daly ion-counting system. The abundance sensitivity for the 90Sr/88Sr ratio was 2.1 × 10-10, and this could ensure measurement of 100 Bq·kg-1 (19 fg·g-1) 90Sr in an environmental sample with 100 μg·g-1 stable strontium concentration. For analytical method validation, 90Sr was determined in two certified reference materials, for example, wild berry (IRMM-426) and freshwater lake sediment (NIST-4354), for the first time in the history of TIMS. This mass spectrometry method is faster than conventional radiometric techniques; however, interference from 90Zr and peak tailing on the higher mass side from 88Sr must be considered for a reliable 90Sr determination.
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Affiliation(s)
- Norbert Kavasi
- Fukushima Project Headquarters , National Institutes for Quantum and Radiological Science and Technology (QST) 4-9-1, Anagawa , Inage-ku , Chiba , 263-8555 , Japan
| | - Sarata Kumar Sahoo
- Fukushima Project Headquarters , National Institutes for Quantum and Radiological Science and Technology (QST) 4-9-1, Anagawa , Inage-ku , Chiba , 263-8555 , Japan
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Zhang Z, Ninomiya K, Yamaguchi Y, Kita K, Tsuruta H, Igarashi Y, Shinohara A. Atmospheric Activity Concentration of 90Sr and 137Cs after the Fukushima Daiichi Nuclear Accident. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:9917-9925. [PMID: 30080962 DOI: 10.1021/acs.est.8b01697] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
On March 11, 2011, the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident occurred and large amounts of radionuclides were discharged into the atmosphere. We have operated continuous aerosol samplings at four locations in Japan from the accident until the end of 2011. The activities of 90Sr and 137Cs in the aerosol samples were measured using low background liquid scintillation counters and high-purity germanium detectors, respectively. The atmospheric 90Sr and 137Cs concentrations decreased exponentially during 2011. The time variation of the 90Sr/137Cs ratio was obtained, and we found that the ratio rose from 1.2 × 10-3 in March to 1.3 × 10-1 in August 2011. One reason for the increase in the 90Sr/137Cs ratio could be the change in the primary emission source of activity at the FDNPP, which occurred near June 2011.
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Affiliation(s)
- Zijian Zhang
- Graduate School of Science , Osaka University , 1-1 Machikaneyama , Toyonaka , Osaka 560-0043 , Japan
| | - Kazuhiko Ninomiya
- Graduate School of Science , Osaka University , 1-1 Machikaneyama , Toyonaka , Osaka 560-0043 , Japan
| | - Yoshiaki Yamaguchi
- Radioisotope Research Center , Osaka University , 2-4 Yamadaoka , Suita , Osaka 565-0871 , Japan
| | - Kazuyuki Kita
- College of Science , Ibaraki University , 2-1-1 Bunkyo , Mito , Ibaraki 310-8512 , Japan
| | - Haruo Tsuruta
- Remote Sensing Technology Center of Japan , 3-17-1Toranomon , Minatoku , Tokyo 105-0001 , Japan
| | - Yasuhito Igarashi
- Meteorological Research Institute , 1-1 Nagamine , Tsukuba , Ibaraki 305-0052 , Japan
| | - Atsushi Shinohara
- Graduate School of Science , Osaka University , 1-1 Machikaneyama , Toyonaka , Osaka 560-0043 , Japan
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Fukuda M, Aono T, Yamazaki S, Nishikawa J, Otosaka S, Ishimaru T, Kanda J. Dissolved radiocaesium in seawater off the coast of Fukushima during 2013–2015. J Radioanal Nucl Chem 2016. [DOI: 10.1007/s10967-016-5009-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Sahoo SK, Kavasi N, Sorimachi A, Arae H, Tokonami S, Mietelski JW, Łokas E, Yoshida S. Strontium-90 activity concentration in soil samples from the exclusion zone of the Fukushima daiichi nuclear power plant. Sci Rep 2016; 6:23925. [PMID: 27048779 PMCID: PMC4822116 DOI: 10.1038/srep23925] [Citation(s) in RCA: 69] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Accepted: 03/15/2016] [Indexed: 11/17/2022] Open
Abstract
The radioactive fission product 90Sr has a long biological half-life (˜18 y) in the human body. Due to its chemical similarity to calcium it accumulates in bones and irradiates the bone marrow, causing its high radio-toxicity. Assessing 90Sr is therefore extremely important in case of a nuclear disaster. In this work 16 soil samples were collected from the exclusion zone (<30 km) of the earthquake-damaged Fukushima Daiichi nuclear power plant, to measure 90Sr activity concentration using liquid scintillation counting. 137Cs activity concentration was also measured with gamma-spectroscopy in order to investigate correlation with 90Sr. The 90Sr activity concentrations ranged from 3.0 ± 0.3 to 23.3 ± 1.5 Bq kg−1 while the 137Cs from 0.7 ± 0.1 to 110.8 ± 0.3 kBq kg−1. The fact that radioactive contamination originated from the Fukushima nuclear accident was obvious due to the presence of 134Cs. However, 90Sr contamination was not confirmed in all samples although detectable amounts of 90Sr can be expected in Japanese soils, as a background, stemming from global fallout due to the atmospheric nuclear weapon tests. Correlation analysis between 90Sr and 137Cs activity concentrations provides a potentially powerful tool to discriminate background 90Sr level from its Fukushima contribution.
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Affiliation(s)
- Sarata Kumar Sahoo
- Project for Environmental Dynamics and Radiation Effects, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
| | - Norbert Kavasi
- Project for Environmental Dynamics and Radiation Effects, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
| | - Atsuyuki Sorimachi
- Department of Radiation Physics and Chemistry, Fukushima Medical University, 1 Hikarigaoka, Fukushima, Fukushima 960-1295, Japan.,Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Hon-cho, Hirosaki City, Aomori 036-8564, Japan
| | - Hideki Arae
- Project for Environmental Dynamics and Radiation Effects, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
| | - Shinji Tokonami
- Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Hon-cho, Hirosaki City, Aomori 036-8564, Japan
| | - Jerzy Wojciech Mietelski
- Department of Nuclear Physical Chemistry, Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Radzikowskiego 152, Poland
| | - Edyta Łokas
- Department of Nuclear Physical Chemistry, Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Radzikowskiego 152, Poland
| | - Satoshi Yoshida
- Project for Environmental Dynamics and Radiation Effects, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
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TOKONAMI S, HOSODA M, IWAOKA K, KUDO H. Outline of the Recovery Support Project for the Great East Japan Earthquake to Namie Town, Fukushima Prefecture. ACTA ACUST UNITED AC 2015. [DOI: 10.5453/jhps.50.11] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Affiliation(s)
- Shinji TOKONAMI
- Hirosaki University, Institute of Radiation Emergency Medicine
| | | | - Kazuki IWAOKA
- Hirosaki University, Institute of Radiation Emergency Medicine
| | - Hiromi KUDO
- Hirosaki University Graduate School of Health Sciences
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Aslan N, Yücel Ü, Kahraman G, Kurt A, Yeltepe E, Özvatan S, Kaya N, Gündoğdu G, Mert H. Determination of 90Sr via Cherenkov counting and modified Eichrom methods in bilberry matrix in the context of BIPM supplementary comparison. J Radioanal Nucl Chem 2014. [DOI: 10.1007/s10967-014-3810-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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