IT is known that when natural ytterbium is irradiated with neutrons, ytterbium isotope of 6 sec. half-life is formed1, and that this emits γ-rays of 0.104 MeV. and of 0.212 MeV.
Strominger, D., Hollander, J. M., and Seaborg, G. T., Rev. Mod. Phys., 30, 585 (1958).
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OKADA, M. Rapid Determination of Ytterbium in Aqueous Solutions and in Thulium Oxide by Neutron Activation. Nature 191, 1090 (1961). https://doi.org/10.1038/1911090a0
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