Decay Data Evaluation Project

Recommended Decay Data. Decay Data Evaluation Project, Laboratoire National Henry Becquerel, www.nucleide.org... 

Information about the Decay Data Evaluation Project is at http //www.nucleide.org/DDEP.htm. Background information from the BIPM about the project can be found at http //www. bipm.o rg/en/publications/monographie-ri-5.html. This page also holds links to composite files containing the complete state of the database at different times. 

DDEP Decay Data Evaluation Project a database recommended by BIPM holding, amongst many other data, half-life and gamma emission probability data. (See Appendix A.)... 

This appendix contains evaluated and recommended data on a selected set of radionuclides suitable for use in the energy and efficiency calibration of detectors. The data in the first edition of this book were taken from X-Ray and Gamma-Ray Standards for Detector Calibration, published by the International Atomic Energy Agency as IAEA TECDOC-619. Since that time, the data have been re-evaluated and extended within the international Decay Date Evaluation Project (DDEP). After much delay, the updated data were published by the IAEA as XGAMMA (X-ray and Gamma-ray Decay Data Standards for Detector Calibration and Other Applications) in late spring, 2007. 

This is a collaborative project between the countries participating in the NEA Data Bank. The JEF-2.2 library comprises sets of evaluated nuclear data, mainly for fission reactor applications it contains a number of different data types, including neutron interaction data, radioactive decay data, fission yield data, thermal neutron scattering raw data and photo-atomic interaction data. JEF-PC is a personal computer package containing selected data from the JEF 2.2 library. 

An evaluation of the available measured nuclear data is necessaiy to produce a recommended file of cross-section data for a nuclide, or an evaluation of fission product yields or the radioactive decay data for a nuclide. This is because there are often several sets of measurements or gaps in the measured data which must be filled using theory. Inconsistent data must be examined and a best estimate made, taking into accoimt any theoretical constraints. There are several evaluation projects which coordinate the efforts of the scientists working in the field and make plans to meet the data requirements. All cross-section... 

JEF, the Joint Evaluated File Project, is a Western European Cooperation, coordinated by a Working Group of the OECD NEA Nuclear Science Committee and compiled by the NEA Data Bank in Paris. The current version of the library is JEF-2.2. EFF, the European Fusion File, is also a Western European evaluation activity closely related to the JEF Project with a particular emphasis on higher energy data (MeV energies) and the materials of importance in Fusion Reactor Technology (Be, Li, Pb and structural materials). The current version is EFF-2.4. There is also EAF, the European Activation file, a compilation of activation cross-sections and decay data. The JEF and EFF Projects now cooperate to produce a single library, JEFF-3, and the EAF activation library is also part of this combined project. 

Lawrence Berkeley National Laboratory (LBNL), Isotopes Project http //ie.lbl.gov (accessed August 25, 2010). The purpose of the Isotopes Project is to gather, evaluate, and disseminate data regarding neutron capture and radioactive decay as well as developing new techniques to distribute the data. 

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