title: Photon emission intensities in the decay of U-235.
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.
authors.affiliation: CEA, LIST, Laboratoire National Henri Becquerel, F-91191 Gif-sur-Yvette Cedex, France. Electronic address: marie-christine.lepy@cea.fr.
authors.forename: Marie-Christine
authors.initials: MC
authors.lastname: Lépy
authors.affiliation: CEA, LIST, Laboratoire National Henri Becquerel, F-91191 Gif-sur-Yvette Cedex, France.
authors.forename: Sylvie
authors.initials: S
authors.lastname: Pierre
authors.affiliation: JRC-Geel, Retieseweg 111, B-2440 Geel, Belgium.
authors.forename: Raf
authors.initials: R
authors.lastname: Van Ammel
authors.affiliation: JRC-Geel, Retieseweg 111, B-2440 Geel, Belgium.
authors.forename: Maria
authors.initials: M
authors.lastname: Marouli
keywords: NORM; Photon emission intensities; Th-231; U-235