Experimental Evidence of the Existence of Element 85 in the Thorium Family

@article{LeighSmith1942ExperimentalEO,
  title={Experimental Evidence of the Existence of Element 85 in the Thorium Family},
  author={Alice Leigh-Smith and Walter Minder},
  journal={Nature},
  year={1942},
  volume={150},
  pages={767-768}
}
BESIDES the branching of the C products in the three radioactive families, Mlle. Perey and Lecoin1,2 have shown another branching in actinium, leading to the creation of element 87. Turner3, considering the regularities in the distribution of isotopes, has concluded that actinium A, thorium A and radium A. should also be β-active. Thus, the element 85 would be created. We have therefore tried to separate element 85 from some 40 mgm. of radiothorium which we had at our disposal. 
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