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Updated: Mar 9, 2026

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
Published on: May 3, 2019
Photon emission intensities in the decay of U-235
Marie-Christine Lépy1, Sylvie Pierre1, Raf Van Ammel2
1CEA, LIST, Laboratoire National Henri Becquerel, F-91191 Gif-sur-Yvette Cedex, France.
Abstract:
New measurements of photon emission intensities in the decay of U-235 were performed. Source was prepared by deposition of a U-235 solution on glass plate. Standardization was carried out by defined solid angle alpha counting, giving the reference activity with 0.7% relative combined uncertainty. Gamma spectrometry was performed with accurately calibrated high-purity germanium detectors. Corrections for source geometry and coincidence summing effects were applied. The reference line (185.72keV) intensity was obtained with 1.3% relative standard uncertainty.
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