Since the Curie-Joliots of Paris discovered artificial radioactivity two years ago (TIME, Feb. 12, 1934), some 40 substances, including salt and copper, have been made radioactive by bombardment with atomic particles. But, unlike radium, these substances are not radioactive in nature. Last week another milestone in the galloping progress of atomic transmutation was marked by the disclosure of a few atoms of Radium E created in the laboratories of the University of California.
Radium E is the seventh and last stage of radium disintegration before it turns into polonium. Its atomic weight is 210. Atomic weight of bismuth is 209. Dr....
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