@article{oai:nagoya.repo.nii.ac.jp:00011505,
 author = {北川, 浩之 and Kitagawa, Hiroyuki},
 journal = {名古屋大学加速器質量分析計業績報告書},
 month = {Mar},
 note = {We have developed a carbon isotope enrichment system for use in conjunction with the Accelerator Mass Spectrometer. Using thermal diffusion of CO, we obtained an enrichment factor of about 3 for ^<13>C for half-gram carbon in 5 days. This means we expect for ^<14>C an enrichment factor of 9,corresponding to an extension of the radiocarbon time scale by >20,000 years. With small modification of this system, it would be possible to perform higher isotope enrichment of ^<14>C. The isotopic enrichment, as a new method for the extension of radiocarbon dating range, is introduced in this report.},
 pages = {80--85},
 title = {同位体濃縮法による炭素14年代測定域の拡大},
 volume = {9},
 year = {1998}
}