International project for the evaluation of decay data
Information from nuclear chemistry and nuclear physics is used in numerous applications. Many of these applications require a knowledge of data on the decay of radionuclides, especially, half-lives and radiation energies and intensities (or emission probabilities). To accommodate this need, for >50 yr people have been compiling and evaluating the measured data to obtain the best values for these quantities. This has resulted in numerous sets, or files, of recommended values, and many of these files have scientific, historical, or national reasons for their continuing existence. The contents of {approximately}20 currently available sets of decay data are discussed, which could be used for the application of gamma-ray spectrometry, i.e., they include at least the half-life and the gamma-ray energies and intensities. Some of these files represent the compilation of data from other files, but several involve the independent, or partially independent, evaluation of the available measured and theoretical information. Some of the interrelationships among these files are noted. These sets of data show varying degrees of agreement and disagreement in the quoted values for a quantity. Many of these data files were prepared once and, even though they are still used, have never been updated, so they may contain values that are now known to be incorrect. A few of the files are updated occasionally and, therefore, can remove the old, poor values. With the hope of reducing the redundancy of these many files, and hopefully to improve the quality of the available data, the author started in 1991 to promote the concept of cooperative, international evaluations for radionuclides of importance in applications to provide an authoritative and widely accepted set of decay data. As a result, an informal international group has been formed to evaluate decay data for radionuclides that are often involved in applications, especially of gamma-ray spectrometry.
- OSTI ID:
- 426374
- Report Number(s):
- CONF-961103-; ISSN 0003-018X; TRN: 96:006307-0095
- Journal Information:
- Transactions of the American Nuclear Society, Vol. 75; Conference: Winter meeting of the American Nuclear Society (ANS) and the European Nuclear Society (ENS), Washington, DC (United States), 10-14 Nov 1996; Other Information: PBD: 1996
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
RADIOISOTOPES
GAMMA SPECTRA
TRANSITION AMPLITUDES
NUCLEAR DATA COLLECTIONS
GAMMA DECAY
HALF-LIFE
INTERNAL CONVERSION
COORDINATED RESEARCH PROGRAMS
EVALUATED DATA
GERMANIUM 68
GALLIUM 68
SELENIUM 75
CERIUM 141
PROMETHIUM 143
RHENIUM 188
IRIDIUM 191
BERYLLIUM 7
SODIUM 22
SODIUM 24
POTASSIUM 40
ARGON 41
SCANDIUM 46
CHROMIUM 51
MANGANESE 54
COBALT 60
ZINC 65
ZIRCONIUM 95
NIOBIUM 95
CADMIUM 109
TIN 113
CESIUM 137
BARIUM 137
CERIUM 139
BARIUM 140
LANTHANUM 140
SAMARIUM 153
GADOLINIUM 153