An attempt for determining 235U/238U ratio for a trace amount of uranium: Search for an extinct radionuclide 247Cm in the early solar system
| Autor: | Mitsuru Ebihara, Satoshi Sakurai, J. Y. Chai, Yasuji Oura, M. Magara, Y. Miyamoto, Shigekazu Usuda, Y. Kokubu |
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| Rok vydání: | 2007 |
| Předmět: |
Chemical procedure
Solar System Extinct radionuclide Chemistry Health Toxicology and Mutagenesis Radiochemistry Public Health Environmental and Occupational Health Analytical chemistry chemistry.chemical_element Fraction (chemistry) Uranium Pollution Analytical Chemistry Isotopic ratio Nuclear Energy and Engineering Meteorite Radiology Nuclear Medicine and imaging Inductively coupled plasma mass spectrometry Spectroscopy |
| Zdroj: | Journal of Radioanalytical and Nuclear Chemistry. 272:397-401 |
| ISSN: | 1588-2780 0236-5731 |
| DOI: | 10.1007/s10967-007-0535-0 |
| Popis: | In order to search for isotopic anomalies of U caused by the disintegration of 247Cm in meteorite samples, an analytical scheme for determining 235U/238U ratio for a small amount of uranium (less than 1 ng U) was established. The isotopic ratio of U was determined by double-focusing inductively coupled plasma mass spectrometry (DF-ICP-MS). With a great improvement of chemical procedure for purifying the uranium fraction separated from meteorite samples, a variation in 235U/238U ratios was resolved at an order of ±4‰ for 100 ppt or 200 pg U in solution. For applying the procedure in searching an evidence of 247Cm as an extinct radionuclide in the early solar system, a selective chemical dissolution of constituent minerals of meteorites using EDTA and HCl was introduced and a chemical purification scheme of uranium for ICP-MS was established. |
| Databáze: | OpenAIRE |
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