PREPARATION OF LONG-LIVED HOLMIUM-163
A sample of Ho/sup 163/ was prepared by pile neutron irradiation of erbium oxide electromagnetically enriched onehundredfold in the mass-l62 isotope. The sample was exposed to 2 x 10/sup 21/n/cm/sup 2/ in the MTR. Mass analysis (prior to chemical separation) of the irradiated sample showed the presence of mass-163 and l65 isotopes, which were not observed prior to irradiation. On the basis of the mass analysis, approximately 5 to lO% of each of the Er/sup 162,164/ isotopes had undergone neutron capture. The sample was chemically fractionated by cation-exchange chromatography to yield pure fractions of the various rare earths. The holmium fraction revealed mass-163 and 165 isotopes, but these isotopes were not observed in comparable yield in the erbium or dysprosium fractions. From the data obtained and on the strength of the K radiation in the holmium fraction, it is concluded that the K-capture half life of Ho/sup 163/ is Greater than 1000 years. (B.O.G.)
- Research Organization:
- Univ. of California, Berkeley
- NSA Number:
- NSA-15-002178
- OSTI ID:
- 4120223
- Journal Information:
- J. Inorg. & Nuclear Chem., Journal Name: J. Inorg. & Nuclear Chem. Vol. Vol: 15
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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