Soddy, Frederick radioactive transformation

Results of this sort were obtained in 1914 by the American chemist Theodore William Richards (1868-1928). They confirmed the deductions about the existence of isotopes that had been made in 1913 by the English chemist Frederick Soddy (1877-1956) from the study of radioactive transformations of uranium and thorium. 

Figure 11. Old Physics Building at McGill University, Montreal. Here Ernest Rutherford and Frederick Soddy discovered the chemical transformations that accompany radioactive emissions. (Photo Copyright J. L. and V. R. Marshall.)...

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