Abstract
Radioactive ishikawaite was characterized and the leaching behavior of U and Th series nuclides from ishikawaite was studied. With the pH values of dilute HCl solutions, the activity ratios of 226Ra/228Ra and 230Th/232Th in the leachate decreased, whereas the activity ratios of 224Ra/228Ra and 228Th/232Th increased. The leaching behavior of annealed ishikawaite was different from that of original ishikawaite. The leaching behavior of U and Th series nuclides is considered due to the different crystallinity and dominant U in ishikawaite as well as due to mineral damages by α-particles and recoiled atoms.
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