I-129 interlaboratory comparison: Phase II results

Large discrepancies seen in a Phase I I-129 Accelerator Mass Spectrometry ( AMS) interlaboratory comparison have prompted a subsequent Phase II compari son. In Phase II of the I-129 AMS interlaboratory comparison, three separat e laboratories prepared AgI from two environmental samples (IAEA 375 soil a nd maple leaves). Each laboratory used its own chemical preparation method; each of these methods being considerably different. The resulting six samp les (two sets of three) were then distributed to the participating I-129 AM S facilities and I-129/I-127 ratios measured. Results and discussion of the Phase II interlaboratory comparison are presented. (C) 2000 Elsevier Scien ce B.V. All rights reserved.