Technetium: The Element of Atomic Number 43

@article{Perrier1947TechnetiumTE,
  title={Technetium: The Element of Atomic Number 43},
  author={C. Perrier and E. Segre},
  journal={Nature},
  year={1947},
  volume={159},
  pages={24-24}
}
IN 1937, Perrier and Segrè showed that radioactive isotopes of element 43 could be formed by neutron or deuteron bombardment of molybdenum1. Several chemical properties of element 43 were established at that time, and some nuclear properties of the spectral isotopes. These isotopes were found after nuclear bombardments by the 37-in. cyclotron of the Radiation Laboratory of the University of California. 
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References

Some Fission Products of Uranium