TY - JOUR
T1 - An attempt for determining 235U/238U ratio for a trace amount of uranium
T2 - Search for an extinct radionuclide 247Cm in the early solar system
AU - Chai, J. Y.
AU - Miyamoto, Y.
AU - Kokubu, Y.
AU - Magara, M.
AU - Sakurai, S.
AU - Usuda, S.
AU - Oura, Y.
AU - Ebihara, M.
N1 - Funding Information:
This work was conducted as a part of Ph.D. study of the author (J.Y. C.) at TMU. Authors are thankful to Dr. H. AMAKAWA for his advice and discussion. This work was partly supported by a Grant-in-aid of the Ministry of Education, Culture and Science (No. 15340193; PI: M. EBIHARA).
PY - 2007/5
Y1 - 2007/5
N2 - 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.
AB - 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.
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U2 - 10.1007/s10967-007-0535-0
DO - 10.1007/s10967-007-0535-0
M3 - Article
AN - SCOPUS:34047111216
VL - 272
SP - 397
EP - 401
JO - Journal of Radioanalytical and Nuclear Chemistry
JF - Journal of Radioanalytical and Nuclear Chemistry
SN - 0022-4081
IS - 2
ER -