Calcium isotope separation by band chromatography using 18-crown-6-ether resin |
| |
Authors: | Saori Umehara Masao Nomura Shin Okumura Toyohiko Yano Tadafumi Kishimoto |
| |
Affiliation: | 1. Research Center for Nuclear Physics, Osaka University, Osaka, Japan;2. Laboratory for Advanced Nuclear Energy, Tokyo Institute of Technology, Tokyo, Japan;3. Graduate School of Science, Osaka University, Toyonaka, Japan |
| |
Abstract: | To develop the 48Ca enrichment process, a feasibility study on a band chromatography was made using 9 M HCl solution and crown ether resin synthesized in porous silica beads. Prior to the chromatographic experiments, distribution coefficients, Kd, of Ca2+ and Sr2+ were measured at different concentrations of these ionic species. The frontal boundary of the chromatography was made by a usual manner of the breakthrough mode of calcium feeding, and the rear boundary was made by introducing strontium as a following ion on the basis of the observed Kd values. It was confirmed that the heavy isotope 48Ca was depleted in the rear boundary region, while 48Ca was enriched in the front boundary region. The values of separation coefficient ε (= α – 1) in three chromatographic operations at different temperatures were observed as 2 × 10?3 ~ 3 × 10?3. The separation coefficients observed in the front boundary regions, where 48Ca was enriched, agreed with those observed in the rear boundary regions, where 40Ca was enriched. |
| |
Keywords: | Calcium isotopes isotope separation isotope ratio isotope effect 48Ca crown ether resin chromatography distribution coefficient |
|
|