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2002 - Publications

 
  • Evaluation of 169Yb decay data (abstract)
    M.M. Bé, E. Schönfeld, J. Morel
    Applied Radiation Isotopes 56 (2002) 181

  • The NUCLÉIDE database for decay data and the “International Decay Data Evaluation Project (abstract)
    M.M. Bé, R. Helmer, V. Chisté
    Journal of Nuclear Science and Technology, Supplement 2 (August 2002) 481

  • International Decay Data Evaluation Project (abstract)
    R. Helmer, E. Browne, M.M. Bé
    Journal of Nuclear Science and Technology, Supplement 2 (August 2002) 455

  • Émissions XK du manganèse : comparaison entre les spectres du métal et d’une source de 55Fe (abstract)
    C. Bonnelle, P. Jonnard, M.M. Bé, M.C. Lépy
    Bulletin du BNM 2001-2, 120 (2002) 7

  • Participation du LNHB au groupe de travail AIEA : “Update of X-ray and gamma-ray standards for detector calibration and other applications”
    M.M. Bé, V. Chisté, C. Dulieu
    LNHB Report DIMRI/LNHB/02-25 (2002)

  • Standardization and decay data of 237Np
    Woods M.J., Woods D.H., Woods S.A., Husband L.J., Jerome S.M., Michotte C., Ratel G., Crespo M., Garcia-Torano E., Rodriguez L., Luca A., Denecke B., Sibbens G., Morel J., Etcheverry M., Santry D., Janssen H., Schönfeld E., Schötzig U.
    Appl. Radiat. Isot., 2002, 56, 415-420


ABSTRACTS :

  • Evaluation of 169Yb decay data
    M.M. Bé, E. Schönfeld, J. Morel

This evaluation of the complete decay scheme of 169Yb sums up the recent measurements carried out during an international exercise in which eleven laboratories were involved, and also takes into account other independent experiments. As a result of the numerous high-quality measurements available, the decay scheme is shown to be highly consistent. The half-life is determined to be 32,018 (5) d, and the emission probabilities of the two reference gamma lines of 198 and 307 keV are recommended to be 35,93 (12)% and 10,046 (45)% respectively.

 

A database and an application, known as NUCLÉIDE, have been developed with the aim of offering users easy access to nuclear and atomic decay data simply by clicking on buttons. The aim of this table is to provide recommended data for nuclides of special interest for metrology or practical applications, such as nuclear medicine, monitoring and reactor shielding etc. Primary recommended data comprise half-lives, decay modes, X-rays, gamma-rays, electron emissions, alpha- and beta-particle transitions and emissions and their uncertainties. In order to update the data and regularly add new evaluations, a new international collaboration has been formed, the Decay Data Evaluation Project (DDEP), comprising evaluators from France, Russia, Germany and the United States. Its objective is to provide carefully recommended values which may eventually become standard data. The results of this work are available on CD-ROM or in print.

 

For over 50 years, scientists have compiled and evaluated experimental results and combined these with theoretical results with the goal of obtaining the best values for these quantities. Based on initial discussions that began in 1991, a new international collaboration, the Decay Data Evaluation Project, DDEP, made up of six evaluators from four countries was formed in 1995 with the objective of evaluating nuclear and atomic data for radionculides of importance in various applications. This collaboration has now been expanded to ten evaluators from six countries (France, Germany, Russia, Spain, United Kingdom, and United States). The DDEP has selected the nuclides to be evaluated, the methodology to be used, and a review process. This Project has published the results for the evaluations for 29 nuclides, 15 more evaluations have been completed, and 28 more are currently being evaluated. In order to provide quick and easy access to the data, a database and the relevant software has been developed in parallel with the evaluation work. The results of the DDEP are available on a CD-ROM NUCLÉIDE. It is expected that these results will become an authoritative and widely accepted set of decay data. 

 

  • Émissions XK du manganèse : comparaison entre les spectres du métal et d’une source de 55Fe
    C. Bonnelle, P. Jonnard, M.M. Bé, M.C. Lépy

The Mn K X-ray emission spectra in metal and 55Fe source have been analyzed and energies, shapes and intensities of the Ka and Kb emissions as well as Kb/Ka ratio have been determined. A good agreement is obtained between the experimental data and the simulated spectra from MCDF calculations for the free atom and ions. Then, the shape and the intensity ratio of the emissions and their variation as a function of the 3d electron number, i.e. of the Mn oxydation number, are well described from the calculations. It is deduced that, for the transition elements, the emissions between inner shells essentially depend on the interaction of inner hole with the d sub-shell and are well described with the help of an atomic model.

 


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