Marie Curie made a detailed examination by the electrical method of the great majority of known substances, including the very rare elements, to see if they possessed any activity. In cases when it was possible, several compounds of the elements were examined. With the exception of thorium and phosphorus, none of the other substances possessed an activity even of the order of 1/100 of uranium.
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About Marie Curie
Marie Curie was a 19th-century French french physicist and chemist. Maria Salomea SkÅ‚odowska Curie, better known as Marie Curie, was a Polish and naturalised-French physicist and chemist. She shared the 1903 Nobel Prize in Physics with her husband Pierre Curie "for their joint researches on the radioactivity phenomena discovered by Professor Henri Becquerel". Read more on Wikipedia →