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Nuclear Decay Data W.G.

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Nuclear Data Session
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International Committee for Radionuclide Metrology (ICRM)
Nuclear Decay Data Working Group

The Nuclear Decay Data Working Group (NDDWG) facilitates awareness and communications between ICRM members interested in the measurement, calculation, compilation and evaluation of decay data, and the maintenance of computer-based decay data files (including: half-lives; energies and emission probabilities of alpha and beta particles, gamma and x-rays, conversion and Auger electrons; internal conversion coefficients; transition types; and other relevant parameters, with their uncertainties).

At the General Meeting, which took place in Oxford in September 2005, of the International Committee for Radionuclide Metrology (ICRM), the Delegates formally approved the recommendation to use the DDEP evaluated decay data in all future nuclear data studies. (See

The ICRM Executive Board has renewed this recommendation, particularly in view of the drafting and refereeing work for the ICRM Conferences.

Members of the NDDWG are encouraged to use the Working Group to communicate experimental and theoretical work, relevant evaluation procedures, their decay data problems, and to establish methodologies that are fully consistent with the satisfactory production of recommended decay data.

Coordinator’s annual report is available in the ICRM Newsletters.

All decay data evaluation activities are published in a Monographie BIPM, which can be downloaded (See BIPM website).
All evaluations and associated comments files are regularly updated (See DDEP page).


This site is non-commercial. Materials and manufacturers are cited only for information purposes and citation does not mean that the site host or the working group recommend or support these materials. Any hyperlinks are only given for convenience and do not imply any support from the working group, the International Committee for Radionuclide Metrology or the French Commissariat à l'Énergie Atomique.
The opinions presented in this site are those of the ICRM working group moderated by the coordinator.