TRANSMUTATION. “The first unquestionable proofs of the transformation of elements into different chemical elements have been provided by the study of the phenomena of radioactivity. There is no doubt that radium is transformed spontaneously into an active gas, radon, emitting at the same time alpha particles, or helions.” (By Frédéric Joliot-Curie on his Nobel Lecture, December 12, 1935).
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