Photon emissions observed in the decay of 233Th

Stock solutions of 233Th were produced by the 232Th(n,γ) reaction and multiple purifications were used to obtain relative intensities of weak transitions. Liquid scintillation counting (absolute disintegration rates) and γ-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 γ-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 ∼30% lower than previous results.