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Study of isotope separation via chemical exchange and electrolytic enrichment（化学交換と電解濃縮による同位体分離の研究）
https://osu.repo.nii.ac.jp/records/2399
https://osu.repo.nii.ac.jp/records/23996245bcac-dff5-4849-9ecb-591b588eef48
| 名前 / ファイル | ライセンス | アクション |
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博士論文内容の要旨および審査結果（19DP02 RITTIRONG ANAWAT）.pdf (8.3 MB)
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博士論文（19DP02 RITTIRONG ANAWAT）.pdf (10.0 MB)
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| Item type | 学位論文 / Thesis or Dissertation(1) | |||||||||
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| 公開日 | 2022-06-14 | |||||||||
| タイトル | ||||||||||
| タイトル | Study of isotope separation via chemical exchange and electrolytic enrichment（化学交換と電解濃縮による同位体分離の研究） | |||||||||
| 言語 | ja | |||||||||
| タイトル | ||||||||||
| タイトル | Study of isotope separation via chemical exchange and electrolytic enrichment | |||||||||
| 言語 | en | |||||||||
| 言語 | ||||||||||
| 言語 | eng | |||||||||
| キーワード | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | Isotope | |||||||||
| キーワード | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | Isotope Separation | |||||||||
| キーワード | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | Enrichment | |||||||||
| キーワード | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | Crown-ether | |||||||||
| キーワード | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | Liquid-Liquid Extraction | |||||||||
| キーワード | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | Calcium | |||||||||
| キーワード | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | Lithium | |||||||||
| キーワード | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | Tritium | |||||||||
| キーワード | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | Electrolytic Enrichment | |||||||||
| 資源タイプ | ||||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_db06 | |||||||||
| 資源タイプ | doctoral thesis | |||||||||
| アクセス権 | ||||||||||
| アクセス権 | open access | |||||||||
| アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||||||
| 著者 |
リッティロン, アナワット
× リッティロン, アナワット
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| 抄録 | ||||||||||
| 内容記述タイプ | Abstract | |||||||||
| 内容記述 | 48Ca is a double beta decay nuclide (ββ) with a natural abundance of 0.19%. It is used in CANDLES (CAlcium fluoride for studies of Neutrino and Dark matters by Low Energy Spectrometer) project to study neutrinoless double beta decay (0νββ). CANDLES aimed to investigate the lepton number non-conservation towards the understanding of a matter and anti-matter asymmetry,Majorana nature of neutrino, and the absolute mass of the neutrino. However, in order to search for such an ultra-rare event, a large amount of 48Ca is required. The industrial-scale isotope enrichment methods are inapplicable for calcium isotope. Therefore, this research aims to investigate the cost-effective way to enrich calcium via chemical exchange using DC18C6 crown-ether. The first milestone is the production of grams scale for super heavy elements production. Afterward, a kilogram scale is profitable for the medical use of 46Ca and 47Ca as an in vivo radiotracer, then towards a ton scale for the CANDLES project. Simultaneously, the increasing demand for lithium isotope for the energy supply on tritium production from 6Li in the nuclear fusion reactor, a pH controller of 7Li, is outstripping the current supply of lithium isotope production. This research, on the use of crown-ether and liquid-liquid extraction, could benefit the isotope separation and enrichment and potentially replace the mercury amalgam method that causes the environmental problems. The isotope composition analysis was measured by (reaction-cell) ICP-MS (RC-ICP-MS) (Agilent 7700 and 7900) and compared to TIMS (TRITON, and MAT261). Careful collection of the isotope composition measured by ICP-MS was described to overcome the mass bias.The comparison measurement of calcium isotope composition measured by ICP-MS and TIMS was found to be in good agreement (CC = 0.72, and 0.72 for TRITON and MAT261, respectively), indicating that the measurement by ICP-MS had a reliable outcome. On the other hand, spike 7Li samples were used to assure the measurement of lithium isotope composition and assure the obtained separation factor. Liquid-liquid extraction (LLE) using DC18C6 crown-ether was carried out, and several fundamental factors were studied, including the presence and absence of crown-ether in the organic phase, the extraction time, various feed concentrations, temperature dependencies (– 15 to 45 °C), solid-liquid extraction, and the contribution of 12M HCl were carried out. The distribution coefficient (D) of lower Ca and Li concentrations showed a significant increase under the presence of 12M HCl. The separation factor (αorg) was consistent with aqueous solvent at 0.991±0.004 for HCl acid and 0.990±0.004 for aqueous solvent (30% w/w).Multistage iterations of calcium were carried out. The results indicated the enrichment of 48Ca under the presence of HCl acid. The maximum separation factor (αaq) of 48Ca/40Ca was increased up to 1.007±0.004 on HCl solvent. In contrast, the aqueous solvent was found to be 1.004±0.004 at the 6th iteration. The iteration stages required to achieve ten times enrichment were 2112 and 3793 for HCl and an aqueous solvent, respectively. The other concentrating element is tritium electrolytic enrichment, which, like calcium and lithium, is an isotope exchange reaction dominated by the nuclear mass effect of the lighter isotope. The tritium enrichment was carried out by the electrolytic using solid polymer electrolyte (SPE) film. This research carried out the improvement on the temperature cooling system. We applied the water and air circulation system and assured that those samples were acceptable. The water circulation system enhanced the enrichment factor up to 13.9±0.2, and the combination of the air circulation system improved the enrichment factor up to 16.0±0.2. This study was conducted toward the international joint research project between Thailand and Japan. The motivation of this collaboration was the nationwide survey of tritium in Thailand before the operation of firstly nuclear power plants. Tap water samples were collected from Thailand. Shinshu University and Kyoto University also collaborated for trace element determination. The study can improve Thailand's international nuclear safety and safeguard potential. |
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| 学位名 | ||||||||||
| 学位名 | 博士（人間環境学） | |||||||||
| 学位授与機関 | ||||||||||
| 学位授与機関識別子Scheme | kakenhi | |||||||||
| 学位授与機関識別子 | 34407 | |||||||||
| 学位授与機関名 | 大阪産業大学 | |||||||||
| 学位授与年度 | ||||||||||
| 内容記述タイプ | Other | |||||||||
| 内容記述 | 2021年度 | |||||||||
| 学位授与年月日 | ||||||||||
| 学位授与年月日 | 2022-03-19 | |||||||||
| 学位授与番号 | ||||||||||
| 学位授与番号 | 人博第4号 | |||||||||
| 著者版フラグ | ||||||||||
| 出版タイプ | VoR | |||||||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||||
