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Journal Articles

Application of the Y separation method using DGA resin for the measurement of $$^{90}$$Sr in human teeth and marine fish bones

Koarai, Kazuma; Matsueda, Makoto; Aoki, Jo; Terashima, Motoki

KEK Proceedings 2023-2, p.155 - 160, 2023/11

In this presentation, we report the results of the application of the Y-separation method using DGA resin to the determination of $$^{90}$$Sr in human teeth and seawater fish bones.

Journal Articles

Mass-spectrometric determination of iodine-129 using O$$_{2}$$-CO$$_{2}$$ mixed-gas reaction in inductively coupled plasma tandem quadrupole mass spectrometry

Matsueda, Makoto; Aoki, Jo; Koarai, Kazuma; Terashima, Motoki; Takagai, Yoshitaka*

Analytical Sciences, 38(11), p.1371 - 1376, 2022/11

https://doi.org/10.1007/s44211-022-00180-w
 Times Cited Count：3 Percentile：15.48(Chemistry, Analytical)

The $$^{129}$$I analysis using ICP-MS is challenging caused by xenon-129 ($$^{129}$$Xe) and $$^{127}$$IH$$_{2}$$ generated from excess stable isotope $$^{127}$$I. In this study, mass discrimination between iodine-129 ($$^{129}$$I) and interfering substances was achieved by inductively coupled plasma-tandem quadrupole mass spectrometry (ICP-MS/MS) with a dynamic reaction cell introduced a mixture gas of O$$_{2}$$ and CO$$_{2}$$. As a result, the ratio of (background noise intensity at m/z 129)/$$^{127}$$I was 3.8 $$times$$ 10$$^{-10}$$ and 10 mBq/L of $$^{129}$$I was analyzed without chemical separation in the presence of 100 mg/L stable $$^{127}$$I. Spiked tests with actual rainwater were performed, and obtained values were agreed with the spiked amounts.

Journal Articles

Improvement of ICP-MS measurement method for $$^{90}$$Sr in hard tissue samples

Koarai, Kazuma; Matsueda, Makoto; Aoki, Jo; Yanagisawa, Kayo*; Fujiwara, Kenso; Terashima, Motoki

KEK Proceedings 2021-2, p.140 - 145, 2021/12

Strontium-90 and $$^{90}$$Y, its daughter nuclide, adverse effects on the bone marrow. Monitoring of $$^{90}$$Sr in the bones have been required after the Fukushima-Daiichi Nuclear Power Plant accident. However, conventional radioactivity measurement method for $$^{90}$$Sr requires a complicated separation of $$^{90}$$Y and a time-consuming measurement. ICP-MS system has been applied to $$^{90}$$Sr concentration survey of water, soil, and edible part of fish. We developed measurement method of $$^{90}$$Sr with ICP-MS and applied the method for cattle bones. We determined $$^{90}$$Sr in the hard tissues of animals that collected in the Fukushima prefecture. Limit of detection in the measurement was 19 Bq/kg.

Journal Articles

Rapid analysis of $$^{90}$$Sr in cattle bone and tooth samples by inductively coupled plasma mass spectrometry

Koarai, Kazuma; Matsueda, Makoto; Aoki, Jo; Yanagisawa, Kayo*; Terashima, Motoki; Fujiwara, Kenso; Kino, Yasushi*; Oka, Toshitaka; Takahashi, Atsushi*; Suzuki, Toshihiko*; et al.

Journal of Analytical Atomic Spectrometry, 36(8), p.1678 - 1682, 2021/08

https://doi.org/10.1039/D1JA00086A
 Times Cited Count：5 Percentile：55.72(Chemistry, Analytical)

Rapid analysis of $$^{90}$$Sr in bone and tooth samples of cattle were achieved by an inductively coupled plasma mass spectrometry (ICP-MS) coupled with mass shift and solid phase extraction techniques. Limit of detection (LOD) in the ICP-MS measurement of 0.1 g samples was lower than that of the radioactivity measurement. Analytical time of the ICP-MS method was reduced from 20 days to 11 hours, compared with the radiometric method. Therefore, the ICP-MS method can be rapid and useful procedure of $$^{90}$$Sr in small bone and tooth samples derived from terrestrial animals.

JAEA Reports

Development of solid-phase extraction technique for ICP-MS analysis of iodine-129 in environmental samples; Comparative study of anion-exchange and silver ion-supported resins on isolation of Iodine-129 from interference elements

Aoki, Jo; Matsueda, Makoto; Koarai, Kazuma; Terashima, Motoki; Fujiwara, Kenso; Abe, Hironobu

JAEA-Research 2021-002, 20 Pages, 2021/05

JAEA-Research-2021-002.pdf:2.75MB

In order to analyze extremely low concentrations of $$^{129}$$I in environmental samples by ICP-MS with high sensitivity and rapidity, it is necessary to remove interfering elements (Na, Mg, K, Ca, Mo, Cd and In) using a pretreatment method with Solid-phase Extraction Resin. Anion Exchange Resins with amino groups have been widely used as Solid-phase Extraction Resins, while Ag+ Supported Resins have also been widely used in recent years. It is necessary to optimize the pretreatment technique based on characteristics of the resins. In this study, we compared in terms of separation of I from matrix elements (Na, Mg, K, Ca, Mo, Cd and In) for DOWEX1-X8, AG 1-X8 and CL Resin, and investigated their suitability for ICP-MS analysis of $$^{129}$$I in environmental samples. The results of adsorption and elution experiments showed that all resins examined uptake and elute I quantitatively. CL Resin showed the highest removal performance of interfering elements, with 3.1% of Mo remaining, but other interfering elements were removed below the detection limit of ICP-MS. However, the Mo remained after the CL Resin treatment could interfere the ICP-MS measurement of $$^{129}$$I, based on the consideration of ratio of $$^{129}$$I and Mo. The eluate from CL Resin was treated with a Cation exchange resin (DOWEX 50WX8). As a result, Mo in the eluate was removed by up to 98% and the interference from Mo was reduced to measurable level. Therefore, the pretreatment method using CL Resin in combination with DOWEX 50WX8 is effective for ICP-MS analysis of $$^{129}$$I at extremely low concentrations (background level).

Journal Articles

Applicability of Sr resin for ICP-MS measurement of $$^{90}$$Sr in hard tissue samples

Koarai, Kazuma; Matsueda, Makoto; Aoki, Jo; Yanagisawa, Kayo*; Fujiwara, Kenso; Terashima, Motoki; Kitamura, Akihiro; Abe, Hironobu

KEK Proceedings 2020-4, p.180 - 185, 2020/11

Strontium-90 and $$^{90}$$Y, its daughter nuclide, adverse effects on the bone marrow. Monitoring of $$^{90}$$Sr in the bones have been required after the Fukushima-Daiichi Nuclear Power Plant accident. However, conventional radioactivity measurement method for $$^{90}$$Sr requires a complicated separation of $$^{90}$$Y and a time-consuming measurement. ICP-MS system has been applied to $$^{90}$$Sr concentration survey of water, soil, and edible part of fish. We applied the ICP-MS system for the bones for the first time. In this study, reference bone (JSAC 0785 fish bone) was used as measurement samples. Sample preparation of the bone was performed using a microwave digestion instrument. After sample preparation, $$^{90}$$Sr was determined using ICP-MS system with cascade separation steps based on on-line column separation and oxygen reaction. Strontium-90 in the bones was successfully separated from Ca, Ba, Y, Zr, Fe, Se, and Ge, which interfered in ICP-MS measurement, in the separation steps.

Journal Articles

Quasi-one-dimensional magnetic interactions and conduction electrons in EuCu$$_5$$ and EuAu$$_5$$ with the characteristic hexagonal structure

Matsuda, Shinya*; Ota, Joji*; Nakaima, Kenri*; Iha, Wataru*; Gochi, Jun*; Uwatoko, Yoshiya*; Nakashima, Miho*; Amako, Yasushi*; Honda, Fuminori*; Aoki, Dai*; et al.

Philosophical Magazine, 100(10), p.1244 - 1257, 2020/04

https://doi.org/10.1080/14786435.2019.1708498
 Times Cited Count：3 Percentile：19.68(Materials Science, Multidisciplinary)

Oral presentation

Adsorption behavior of zirconium and hafnium ions in strong acid solution using Desferrioxamine B Immobilized micropolymer

Aoki, Jo; Abe, Miki*; Butsugan, Michio*; Onuma, Chisa*; Fujiwara, Kenso; Takagai, Yoshitaka*

no journal, , 

Safety management of high dose radioactive wastes such as debris is an important issue in dealing with decommissioning Fukushima Daiichi Nuclear Power Plant. Zeolites currently used as adsorbents for radioactive wastes show high selectivity only to alkali metal ions. Therefore, in this study, using DFB-EG80 (S), which desferrioxamine B was immobilized on a micropolymer and forms a stable complex with high-valent metal ions, examined adsorption of zirconium (Zr) ions and hafnium (Hf) ions, in a strong acid solution. As an experimental method, 3 mg of DFB-EG80(S) and 10 mL of 52 kinds of metal elements of 10 ppb were added to disposable centrifuge tubes, and shake at 50 degrees, 160 rpm for 20 minutes in a shaking constant temperature bath. As a result, it was possible to adsorb up to 96.7 % and 97.9 % of Zr and Hf ions. In addition, it became possible to separate 52 elements into 4 elements of Zr, Hf, Nb and Ta. In addition, it became possible to separate 52 elements into 4 elements of Zr, Hf, Nb and Ta under shaking conditions of 70 degrees.

Oral presentation

System validation of ICP-MS measurement for determination of $$^{90}$$Sr in hard tissues of animals

Koarai, Kazuma; Matsueda, Makoto; Aoki, Jo; Yanagisawa, Kayo*; Fujiwara, Kenso; Terashima, Motoki; Kitamura, Akihiro; Abe, Hironobu

no journal, , 

Strontium-90 and $$^{90}$$Y, its daughter nuclide, adverse effects on the bone marrow. Monitoring of $$^{90}$$Sr in the bones have been required after the Fukushima-Daiichi Nuclear Power Plant accident. However, conventional radioactivity measurement method for $$^{90}$$Sr requires a complicated separation of $$^{90}$$Y and a time-consuming measurement. ICP-MS system has been applied to $$^{90}$$Sr concentration survey of water, soil, and edible part of fish. We applied the ICP-MS system for the bones. We determined $$^{90}$$Sr in the hard tissues of animals that collected in the Fukushima prefecture. Limit of detection in the measurement was 19 Bq/kg.

Oral presentation

Strontium-90 measurement in trace amount of hard tissues for distribution analysis

Koarai, Kazuma; Matsueda, Makoto; Aoki, Jo; Yanagisawa, Kayo*; Fujiwara, Kenso; Terashima, Motoki; Kino, Yasushi*; Oka, Toshitaka; Okutsu, Kenichi*; Yamashita, Takuma*; et al.

no journal, , 

We demonstrated a method of $$^{90}$$Sr measurement in small pieces of hard tissues with radioactivity measurement or ICP-MS measurement. Interference elements of the measurements were removed by chemical separation. We could determine $$^{90}$$Sr in 0.1 g of hard tissues by radioactivity measurement method and ICP-MS method. Limit of detection of the ICP-MS method was lower than that of the radioactivity measurement. The ICP-MS method is adequate method for distribution analysis of $$^{90}$$Sr in the hard tissues.

Oral presentation

Development of analytical method of $$^{90}$$ in bones with Y separation by DGA resin

Koarai, Kazuma; Matsueda, Makoto; Aoki, Jo; Fujiwara, Kenso; Terashima, Motoki

no journal, , 

Chemical separation with DGA resin can remove interference radionuclides (Cs, Pb, Bi, Th, and U) and bone matrix (Na, Mg, K, Sr, and Ba) from $$^{90}$$Y in bones. The developed method is adequate to $$^{90}$$Sr analysis for standard material of bone.

Oral presentation

Development of solid-phase extraction technique for ICP-MS analysis of Iodine-129 in sea water; Effects of interfering elements and coexisting anions on sorption of I to silver ion-supported resin

Aoki, Jo; Matsueda, Makoto; Koarai, Kazuma; Terashima, Motoki

no journal, , 

In this study, we confirmed that interfering elements and coexisting anions have no effect on sorption of I to silver ion supported resin. The developed method was found to be able to enrich very low concentrations of $$^{129}$$I to the target level for seawater analysis by ICP-MS.

Oral presentation

Progress of ICP-MS method in rapid analysis of radionuclides

Terashima, Motoki; Matsueda, Makoto; Koarai, Kazuma; Aoki, Jo

no journal, , 

no abstracts in English

Oral presentation

Rapid analysis of $$^{90}$$Sr in trace amount of bone; Application of inductively coupled plasma mass spectrometry

Koarai, Kazuma; Matsueda, Makoto; Aoki, Jo; Yanagisawa, Kayo*; Terashima, Motoki; Fujiwara, Kenso; Kino, Yasushi*; Oka, Toshitaka; Takahashi, Atsushi*; Suzuki, Toshihiko*; et al.

no journal, , 

Rapid analysis of $$^{90}$$Sr in bone and tooth samples of cattle were achieved by an inductively coupled plasma mass spectrometry (ICP-MS) coupled with mass shift and solid phase extraction techniques. Limit of detection (LOD) in the ICP-MS measurement of 0.1 g samples was lower than that of the radioactivity measurement. Analytical time of the ICP-MS method was reduced from 20 days to 11 hours, compared with the radiometric method. Therefore, the ICP-MS method can be rapid and useful procedure of $$^{90}$$Sr in small bone and tooth samples derived from terrestrial animals.

Oral presentation

Development of analytical method for Sr-90 using ICP-MS; Aim for Sr-90 measurement for otolith

Koarai, Kazuma; Matsueda, Makoto; Aoki, Jo; Yanagisawa, Kayo*; Terashima, Motoki; Fujiwara, Kenso; Kino, Yasushi*; Oka, Toshitaka; Takahashi, Atsushi*; Suzuki, Toshihiko*; et al.

no journal, , 

Rapid analysis of $$^{90}$$Sr in bone and tooth samples of cattle were achieved by an inductively coupled plasma mass spectrometry (ICP-MS) coupled with mass shift and solid phase extraction techniques. Limit of detection (LOD) in the ICP-MS measurement of 0.1 g samples was lower than that of the radioactivity measurement. Analytical time of the ICP-MS method was reduced from 20 days to 11 hours, compared with the radiometric method. The ICP-MS method was improved by ICP-MS/MS and oxygen-ammonia mixed gas reaction.

Oral presentation

Determination of low-level $$^{90}$$Sr in small hard tissue using ICP-DRC-MS/MS with O$$_{2}$$+NH$$_{3}$$ gas reaction

Koarai, Kazuma; Matsueda, Makoto; Aoki, Jo; Terashima, Motoki

no journal, , 

In this study, we introduce an analytical method for low-level $$^{90}$$Sr in small hard tissues with ICP-DRC-MS/MS using oxygen and ammonia mixed gas reaction and issues of this analytical method.

Oral presentation

Gas phase reaction of trace iodine-129 for determination by ICP-DRC-MS/MS

Matsueda, Makoto; Aoki, Jo; Koarai, Kazuma; Terashima, Motoki; Takagai, Yoshitaka*

no journal, , 

Long half-life $$^{129}$$I have provided important information as a tracer to estimate the environmental behaviour of radioisotopes released from nuclear facilities. Inductively coupled plasma-mass spectrometry (ICP-MS) is capable of rapid data acquisition, but the application is limited caused by the main interferences at m/z 129 ($$^{127}$$IH$$_{2}$$$$^{+}$$ and $$^{129}$$Xe$$^{+}$$). It has been reported that $$^{129}$$Xe$$^{+}$$ can be removed by introducing O$$_{2}$$ gas into the reaction cell in an ICP-MS. Tandem mass spectrometry (ICP-MS/MS) has also made it possible to suppress the formation of $$^{127}$$IH$$_{2}$$$$^{+}$$. However, more precise removal of interferences is required to apply various environmental samples. In this study, the gas-phase reactions between $$^{129}$$I and interferents were investigated in a reaction cell of an ICP-MS/MS. The results showed that introducing an O$$_{2}$$-CO$$_{2}$$ gas mixture into the reaction cell reduced the background counts of m/z 129 to a minimum level.

Oral presentation

Removal processes of dissolved elements in groundwater leached from waste by redox reaction

Watanabe, Yusuke; Terashima, Motoki; Matsueda, Makoto; Koarai, Kazuma; Aoki, Jo; Inoue, Junya

no journal, , 

18 (Records 1-18 displayed on this page)
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