PREPARATION OF LONG-LIVED TERBIUM-157 AND TERBIUM-158

Journal Article · Mon Oct 31 23:00:00 EST 1960 · J. Inorg. & Nuclear Chem.

DOI:https://doi.org/10.1016/0022-1902(60)80106-6· OSTI ID:4086560

Naumann, R. A.; Michel, M. C.; Power, J. L.

A 5-mg sample of dysprosium oxide enriched to 13.8% in Dy/sup 156/ was irradiated with neutrons in the Materials Testing Reactor. The sample received an exposure of 2 x 10/sup 21/ neutrons/cm/sup 2/ over a three-month interval. Four months after irradiation, mass analysis was made of the unseparated sample. The presence of mass peaks at 157, 159, 165, and 166, unobservable in the sample before irradiation, indicated neutron capture in Dy/sup 156/, Dy/sup 158/, and Dy/ sup 16/< s4>s. The samples were chemically fractionated, and scintillation spectroscopy were chemically fractionated, and scintillation spectroscopy revealed the presence of Ho/sup 166/, Dy/sup 159/, and Tb/sup 16/< s0>s. Mass- spectrometric investigation of the terbium fraction revealed the existence of mass peaks at 157, 158, 159, and 160, indicating the preparation of new long- lived isotopes Tb/sup 157/and Tb/sup 158/ s. Calculations indicated that the K- capture half lives of these isotopes are greater than 30 and 15 years, respectively. (M.C.G.)

• Research Organization: Univ. of California, Berkeley
• NSA Number: NSA-15-010995
• OSTI ID: 4086560
• Report Number(s): UCRL-9287
• Journal Information: J. Inorg. & Nuclear Chem., Journal Name: J. Inorg. & Nuclear Chem. Vol. Vol: 16
• Country of Publication: United States
• Language: English

Related Subjects

CAPTURE
CHEMISTRY
DYSPROSIUM 156
DYSPROSIUM 158
DYSPROSIUM 159
DYSPROSIUM 164
DYSPROSIUM OXIDES
ENRICHMENT
HALF-LIFE
HOLMIUM 166
IRRADIATION
MASS
MASS SPECTROMETERS
MATERIALS TESTING
NEUTRONS
PREPARATION
RESEARCH REACTORS
SCINTILLATION COUNTERS
SPECTROSCOPY
TERBIUM 157
TERBIUM 158
TERBIUM 160