IT is known that when natural erbium is irradiated with neutrons, erbium-167m (2.5 sec.) is formed1.
Jakovlev, J. V., International Conference on Peaceful Uses of Atomic Energy, Geneva, Paper 632 (U.S.S.R.) (1955).
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OKADA, M. Rapid Analysis of Erbium by Neutron Activation followed by γ-Ray Spectrometry. Nature 188, 52 (1960). https://doi.org/10.1038/188052a0
Journal of Radioanalytical Chemistry (1982)
Analytical Chemistry (1962)