Marie Curie and her husband Pierre were pioneers in the study of radiation. Marrie decided to study the mysterious radiation that had been discovered in 1896, by henri Becquerel. She concluded that, the substance pitchblende contains a small amount of an unkown element that was capable of spontaneous radiation.
Pierre Curie also joined his wife’s work , In the course of their research, they discovered two new elements with the named polonium and radium. They were the first to use the term radioactivity for this phenomenon of spontaneous radiation.
In 1903, Pierre and Marrie Curie were awarded the Nobel Prize for Physics, along with Henri Becquerel for their work.