International program to improve decay data for transactinium nuclides
To help meet an identified need for precise decay data, in 1977 the IAEA organized an international Coordinated Research Program (CRP) to measure and evaluate half-lives and ..gamma../sup -/ and ..cap alpha../sup -/ emission probabilities for selected transactinium nuclides of importance for reactor technology. The CRP goals were (1) to determine a list of data that needed improvement, (2) to encourage new measurements, and (3) to evaluate the available data. All three phases of this work are now complete. Our participation in this effort has involved the measurement of ..gamma..-ray emission probabilities for /sup 232, 233, 235/U, /sup 238, 239, 240, 241/Pu, /sup 229/Th and /sup 233/Pa, as well as participating in the data evaluation. The ..gamma..-emission probabilities were determined from the measurement of ..gamma..-emission rates with the goal of obtaining uncertainties of less than or equal to 1%. ..gamma.. measurements were made on calibrated Ge detectors. These calibrations were done by standard methods, generally involving measurements at approx. 60 ..gamma..-ray energies from 14 to 2700 keV. The efficiency-calibration functions were assigned uncertainties ranging from 2% below 50 keV to 0.50% from 400 to 1400 keV. The determination of the decay rates of the various sources involved several techniques. The /sup 238/Pu, /sup 239/Pu and /sup 240/Pu samples were calibrated by gross ..cap alpha..-emission-rate measurements at NBS. The /sup 235/U sample was taken from an NBS-calibrated spike solution. The /sup 241/Pu and /sup 233/U samples were calibrated by isotope-dilution mass spectrometry based on spikes of the calibrated /sup 239/Pu, /sup 240/Pu and /sup 235/U materials. Some of our results are given, together with a comparison of some present and previous results. 20 refs.
- Research Organization:
- Idaho National Engineering Lab., Idaho Falls (USA)
- DOE Contract Number:
- AC07-76ID01570
- OSTI ID:
- 5599338
- Report Number(s):
- EGG-M-08085; CONF-850533-4; ON: DE85011258
- Country of Publication:
- United States
- Language:
- English
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Experimental-- Radioactive Decay-- (-1987)
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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY
ALPHA DECAY RADIOISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
COOPERATION
COORDINATED RESEARCH PROGRAMS
DECAY
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FISSION
GAMMA SPECTRA
HALF-LIFE
HEAVY NUCLEI
IAEA
INTERNATIONAL COOPERATION
INTERNATIONAL ORGANIZATIONS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MINUTES LIVING RADIOISOTOPES
NUCLEAR REACTIONS
NUCLEI
PLUTONIUM 238
PLUTONIUM 239
PLUTONIUM 240
PLUTONIUM 241
PLUTONIUM ISOTOPES
RADIOISOTOPES
RESEARCH PROGRAMS
SPECTRA
SPONTANEOUS FISSION
URANIUM 233
URANIUM 235
URANIUM ISOTOPES
YEARS LIVING RADIOISOTOPES