Abstract
THE isotope Ba139 is radioactive with a half-life of 85 min. decaying to La139 by β- emission. This activity was first reported by Pool and Cork1. Kalbfell and Cooley2, using absorption methods, have reported a continuous β-spectrum with a maximum energy of 1 MeV. accompanied by γ-radiation of energy 0.6 MeV., while Born and Seelmann-Eggebert3 report a maximum β-energy of 2·3 MeV. also by an absorption method.
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References
Pool, M. L., and Cork, J. M., Phys. Rev., 51, 1010 (1937).
Kalbfell, D. C., and Cooley, R. A., Phys. Rev., 58, 91 (1940).
Born, H. T., and Seelmann-Eggebert, W., Naturwiss., 31, 210 (1943).
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SHEPHERD, L., HILL, J. Decay of Barium-139. Nature 162, 566–567 (1948). https://doi.org/10.1038/162566b0
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DOI: https://doi.org/10.1038/162566b0
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