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Honda, Maki; Martschini, M.*; Marchhart, O.*; Steier, P.*; Golser, R.*; Sakaguchi, Aya*
Hoshasen (Internet), 48(4), p.130 - 136, 2024/02
Strontium-90 (Sr, 28.9 years) is a key fission product nuclide in internal dose assessment because it accumulates in bones and teeth in the body, causing health problems. Therefore, it is essential to know the distribution of
Sr in the environment and its temporal variation (
Sr enrichment in biota), which requires efficient analysis of many environmental samples. An analysis of environmental samples with known
Sr concentrations conducted with the 3 MV AMS facility (VERA: Vienna Environmental Research Accelerator) at the University of Vienna, Austria, towards the practical application of
Sr AMS, the results of which are detailed in this paper. In this study, the validity of the AMS method was demonstrated by analyzing environmental samples with known
Sr concentrations (IAEA-447, IAEA-A-12, and IAEA-TEL-2015-03 sample 5: 1 dry-g each). The chemical separation developed in this study takes approximately two days and is a more straightforward procedure than conventional
-ray detection methods. The
Sr measurements were conducted on the AMS system combined with the Ion Laser InterAction Mass Spectrometry (ILIAMS) system. The AMS method achieved a limit of detection
0.1 mBq (
1.3
10
atoms) for
Sr, which is 1/30th of typical
-ray detection. As a result of the lower detection limit, the AMS method allows
Sr quantification with smaller sample volumes. For example, a Japanese freshwater sample with a
Sr concentration of 4 mBq/L requires a sample volume of 5 liter
Honda, Maki; Martschini, M.*; Wieser, A.*; Marchhart, O.*; Lachner, J.*; Priller, A.*; Steier, P.*; Golser, R.*; Sakaguchi, Aya*
JAEA-Conf 2022-001, p.85 - 90, 2022/11
Accelerator mass spectrometry (AMS) is an analytical method that combines mass spectrometry with a tandem accelerator, which has been used mainly in nuclear physics experiments. AMS is used to measure radionuclides with half-lives of 10-10
years. For radionuclides with half-lives of this order, the method of measuring their mass is 10
-10
times more sensitive than measuring their activity. Because of this advantage, AMS has been widely applied in Earth and planetary sciences, atomic energy research, and other fields. Among the various studies, Wallner et al. (2021, 2016) have achieved excellent work in Earth and planetary sciences. For example, they have attained the ultra-sensitive analysis of
Fe and
Pu in environmental samples. These are radionuclides produced by rapid-neutron-capture (
-process) nucleosynthesis. Our recent work shows that a new AMS system (VERA, University of Vienna), which combines laser isobaric separation and a typical AMS system, has been successfully applied to the ultra-sensitive determination of
Sr and
Cs in environment. For
Sr in environmental samples, the
-ray measurement by the milking of the daughter nuclide
Y is still the principal method, which takes 3-6 weeks. The new AMS method has a detection limit of
0.1 mBq, which is comparable to that of
-ray measurement, with a more straightforward chemical treatment than
-measurement. Our achievement demonstrates that AMS can be a practical new method for determining
Sr in the environment.
Honda, Maki; Martschini, M.*; Marchhart, O.*; Priller, A.*; Steier, P.*; Golser, R.*; Sato, Tetsuya; Tsukada, Kazuaki; Sakaguchi, Aya*
Analytical Methods, 14(28), p.2732 - 2738, 2022/07
Times Cited Count:5 Percentile:45.09(Chemistry, Analytical)The sensitive Sr analysis with accelerator mass spectrometry (AMS) was developed for the advances of environmental radiology. One advantage of AMS is the ability to analyze various environmental samples with
Sr/
Sr atomic ratios of 10
in a simple chemical separation. Three different IAEA samples with known
Sr concentrations (moss-soil, animal bone, Syrian soil: 1 g each) were analyzed to assess the validity of the chemical separation and the AMS measurement. The
Sr measurements were conducted on the AMS system combined with the Ion Laser InterAction MasSpectrometry (ILIAMS) setup at the University of Vienna, which has excellent isobaric separation performance. The isobaric interference of
Zr in the
Sr AMS was first removed by chemical separation. The separation factor of Zr in two-step column chromatography with Sr resin and anion exchange resin was 10
. The
Zr remaining in the sample was removed by ILIAMS effectively. This simple chemical separation achieved a limit of detection
0.1 mBq in the
Sr AMS, which is lower than typical
-ray detection. The agreement between AMS measurements and nominal values for the
Sr concentrations of IAEA samples indicated that the new highly-sensitive
Sr analysis in the environmental samples with AMS is reliable even for high matrix samples of soil and bone.
Honda, Maki; Martschini, M.*; Marchhart, O.*; Priller, A.*; Steier, P.*; Golser, R.*; Sakaguchi, Aya*; Sueki, Keisuke*
no journal, ,
no abstracts in English
Honda, Maki; Martschini, M.*; Marchhart, O.*; Steier, P.*; Golser, R.*; Sakaguchi, Aya*
no journal, ,
Accelerator mass spectrometry (AMS) is a relatively new analytical chemistry in applied research utilizing accelerators. In Japan, AMS has been used to measure C, which is applied for dating in archaeology, and
Cl, which is used to assess the environmental effects of the disposal of radioactive waste from nuclear power plants and accelerator facilities. In recent years, conventional AMS systems have been combined with new analytical chemistry techniques to separate isobars, such as laser photo-detachment, leading to improved performance and the possibility of measuring new nuclides in AMS. This presentation will mainly focus on developing a highly sensitive
Sr analysis technique utilizing the laser photo-detachment method equipped in the 3MV AMS at the University of Vienna. Furthermore, the feasibility of
Sr AMS at facilities in Japan will be discussed.
Honda, Maki; Martschini, M.*; Lachner, J.*; Wieser, A.*; Marchhart, O.*; Steier, P.*; Golser, R.*; Sakaguchi, Aya*
no journal, ,
The effective isobar suppression system based on the interaction between accelerated ions and lasers (photons) has been introduced into conventional AMS systems, allowing an increasing number of nuclides to be measured by AMS. This presentation will give an overview of the analytical technique, the measurement results, and the remaining challenges as examples of world-leading successful AMS of Sr and
Cs in environmental samples obtained from the IAEA and others. Moreover, the applicability of the AMS method in geoscience (e.g., studies of
Sr distribution in the hydrosphere and the range of applicable environmental samples) will also be discussed.
Honda, Maki; Martschini, M.*; Lachner, J.*; Marchhart, O.*; Wieser, A.*; Priller, A.*; Steier, P.*; Golser, R.*; Sakaguchi, Aya*
no journal, ,
We have developed new analytical methods for Sr (28.79yr) and
Cs (2.3
10
yr) by accelerator mass spectrometry (AMS) for the further development of the research on the environmental fate of artificial radionuclides
Sr and
Cs (30.1yr). The AMS method enables the analysis of trace amounts of
Sr and
Cs with a simple chemical separation procedure. Having a longer half-life
Cs applies as a proxy for
Cs. For
Sr, SrF
targets were prepared from radioactive environmental reference materials with known
Sr concentrations (IAEA) by a chemical separation procedure that takes about two days to complete.
Sr measured by AMS at VERA, University of Vienna. As a result, a limit of detection of
0.1 mBq was obtained, which is comparable to the
ray measurement. The detection of
Sr in environmental samples was also successful, indicating that the
Sr AMS can apply to environmental samples. On the other hand, there are still some technical challenges in the
Cs AMS. Therefore, the experimental measurements are in progress.