Abstract
A new reference material was characterized for 229Th molality and thorium isotope amount ratios. This reference material is intended for use in nuclear forensic analyses as an isotope dilution mass spectrometry spike. The reference material value and expanded uncertainty (k = 2) for the 229Th molality is (1.1498 ± 0.0016) × 10−10molg−1 solution. The value and expanded uncertainty (k = 2) for the n(230Th)/n(229Th) ratio is (5.18 ± 0.26) × 10−5 and the n(232Th)/n(229Th) ratio is (3.815 ± 0.092) × 10−4.
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