In 1978, the International Atomic Energy Agency (IAEA) organized a Coordinated Research Program (CRP) to measure and evaluate highly precise decay data (primarily half-lives, -ray emission probabilities, and -particle intensities for a number of transactinium nuclides identified as being important for fission-reactor fuel cycles, nuclear-materials safeguards, and waste-management procedures. Radionuclide metrology laboratories from five nations around the world participated in this multi-year program. C. W. Reich, from INL, was the Coordinator/Representative of the U.S. involvement in this CRP. This effort was unique in that not only data evaluation was involved but also a carefully thought out program of precise data measurements was carried out. The work of the CRP, which concluded in 1985, has led to a considerable improvement in our knowledge of precise decay data for a number of transactinium nuclides. They have been published as one of the Technical Reports Series (#261) issued by the IAEA in 1986. They have also been used as input data for the appropriate evaluations in the Evaluated Nuclear Data File/B (ENDF/B) and in the Evaluated Nuclear Structure Data File (ENSDF).
In 1998, the International Atomic Energy Agency (IAEA) organized a coordinated research project (CRP) to evaluate the decay data for about 55 radionuclides that are useful for the calibration of detectors, especially semiconductor gray detectors. This CRP has 10 participants from Brazil, France, Germany, Russia, the United Kingdom, and the United States. Dr. Helmer of the INEEL is the UP participant. This CRP is expected to complete its work in 2001. This work will replace that of a previous CRP in which Dr. Helmer participated and which reported its results in report IAEA-TECDOC-619 (1991).
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- David Nigg, (208) 526-7627, Send E-mail