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Updated: Jul 2, 2026

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
Published on: May 3, 2019
Photon emissions observed in the decay of 233Th
Daniel J DeVries1, Henry C Griffin
1Department of Chemistry, University of Michigan, Ann Arbor, MI 48109, USA. dandev@umich.edu
Abstract:
Stock solutions of (233)Th were produced by the (232)Th(n,gamma) reaction and multiple purifications were used to obtain relative intensities of weak transitions. Liquid scintillation counting (absolute disintegration rates) and gamma-ray spectroscopy with HPGe detectors yielded absolute photon intensities. Absolute intensities in % (with statistical uncertainties) of prominent radiations (L and K X-rays; 29, 86, and 459 keV gamma-rays) are 8.23(8), 1.32(10), 2.17(1), 1.843(2), and 0.989(2), respectively. These intensities are more precise and approximately 30% lower than previous results.
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