Irène and Frédéric developed a technique for inducing artificial radioactivity in previously nonradioactive elements, a breakthrough that had widespread ramifications. Scientists were better able to observe the behavior of atoms as they underwent radioactive decay, which led to new insights into atomic structure and nuclear physics. In medicine, radioactive iodine prepared using the Joliot-Curies' methods became a key means of treating thyroid diseases, and the ability to easily produce radioactive material at a commercial scale was essential to the development of new cancer treatments. In the years following her Nobel Prize win, Irène followed in her mother's footsteps once more; in 1946, she became the director of the Radium Institute in Paris, where Marie ran her own laboratory for 25 years.

By the Numbers

Marie Curie is the only person to win a Nobel Prize in two scientific fields.

In 1906, the Curie family suffered a tragedy when Pierre Curie died suddenly in an accident. Though Marie was devastated by the loss of her spouse and research partner, she carried on the research they had been conducting into the nature of radioactive elements. In 1906, she replaced her husband as a professor at the Sorbonne in Paris, becoming the first woman to hold the position, and continued her career as one of the leading physicists in the world. In 1910, she became the first person to isolate pure radium metal, a major breakthrough in the study of radioactivity. Her achievement was recognized in 1911 with her second Nobel Prize, this time in chemistry. Though other scientists have won two Nobel Prizes, Curie's recognition in both physics and chemistry gives her the unique distinction of being the only person to be awarded the prize in two different scientific fields. To this day, no other scientist has accomplished this feat.

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