Letter | Published:

Radioactive Isotopes of Element 43


PROF. E. O. LAWRENCE, of the University of California, gave us a plate of molybdenum which had been irradiated with deuterons in the Berkeley cyclotron. The plate showed a strong radioactivity due to more than one body. The half-value periods are of the order of magnitude of some months. A chemical investigation of the activity ruled out any radioactive isotopes of zirconium, niobium, molybdenum or ruthenium, and shows most probably that the activity is due to isotopes of atomic number 43 (masurium of I. and W. Noddack).

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  1. 1

    Geilmann and Weibke, Z. anorg. allgem. Chemie, 199, 120 (1931).

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