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The REIMEP-22 inter-laboratory comparison aimed at determining the production date of a uranium certified test sample (i.e. the last chemical separation date of the material). Participants in REIMEP-22 on  “U Age Dating – Determination of the production date of a uranium certified test sample”  received one low-enriched 20 mg uranium sample for mass spectrometry measurements and/or one 50 mg uranium sample for  α -spectrometry measurements, with an undisclosed value for the production date. They were asked to report the isotope amount ratios  n ( 230 Th)/ n ( 234 U) for the 20 mg uranium sample and/or the activity ratios  A ( 230 Th)/ A ( 234 U) for the 50 mg uranium sample in addition to the calculated production date of the certified test samples with its uncertainty. Reporting of the  231 Pa/ 235 U ratio and the respective calculated production date was optional.

REIMEP-22 inter-laboratory comparison: “U Age Dating – determination of the production date of a uranium certified test sample”