著者名,タイトル,雑誌名,ISSN,出版者名,出版日付,巻,号,ページ,URL,URL(DOI) Kawakami Hajime,228Ra and 226Ra radioactivities of the surface water in the northwestern North Pacific,,,JAMSTEC,2023-05-01,,,,https://cir.nii.ac.jp/crid/1460577618940460800,https://doi.org/10.17596/0003464