![]() They measured radium’s intensity at around 3,000 times uranium. Later that year, on December 21, 1898, the Curies found radioactive compounds similar to barium compounds that became a new element they named radium because of the way it emitted energy in rays. ![]() In this paper, the pair also used the term radioactivity for the first time. In documenting their work they wrote, “We thus believe that the substance that we have extracted from pitchblende contains a metal never known before, akin to bismuth in its analytic properties.” The substance was about 300 times more strongly active than uranium. The year before, Marie Curie had died, aged sixty-six, of leukemia caused by radiation.They first discovered polonium, named for Marie’s homeland Poland, in July 1898. Their daughter Irène married the French physicist Frederic Joliot and she and her husband won the Nobel prize for chemistry in 1935 for their discovery that radioactivity could be produced artificially in the laboratory. Marie won the Nobel prize for chemistry by herself in 1911 (she is still the only person to have been awarded the prizes for both physics and chemistry). ![]() Pierre and Marie had won the prize for physics in 1903 jointly with Henri Becquerel. Marie worked on, and the Curie family accumulated Nobel prizes in the most astonishing quantities. The unit of radioactivity was eventually named the 'curie' in honour of Pierre, who was tragically killed in a Paris street accident in 1906, when he was only forty-six. They announced their discovery of radium in a paper read to the French Academy of Sciences on December 26th, 1898, which informed that august body of 'a new strongly radioactive substance contained in pitchblende'. After a summer holiday break in the Auvergne, bicycling and playing with their baby daughter Irène, the Curies returned to their experiment. Polonium, however, did not account for all the pitchblende's radiation. By July they had discovered an element they christened 'polonium' in compliment to Marie's Polish homeland (Marie also coined the ominous term 'radioactivity'). Her husband, who, meanwhile, had been turned down for a professorship at the Sorbonne, joined her to continue the experiments in which the Curies laid the foundations of nuclear physics. On February 17th, 1898, she tested a sample of heavy black pitchblende (a naturally-occurring mineral containing uranium) which she found was emitting unexpectedly strong radiation. Marie sat at one of the worktables with a flimsy apparatus of rods, cylinders and wires. They built their own ionisation chamber out of wooden grocery crates. It had brick walls, one or two rickety chairs and a few wooden worktables. Marie started working in a storage space on the ground floor of the Physics and Chemistry school where Pierre was teaching. It was a happy partnership of two people absorbed in science and each other. She met Pierre and they fell in love and were married in 1895, when she was twenty-seven and he thirty-six. Prodigiously bright and dedicated, she went to Paris in 1891 to study science and live in a Latin Quarter garret on tea and bread and butter. Marie Curie was a Pole, who started life in Warsaw as Maria Sklodowska in 1867, the daughter of a teacher of maths and physics. Pierre Curie was a Parisian doctor's son, born in 1859, who studied at the Sorbonne and in 1882 was appointed head of the laboratory at the School of Physics and Chemistry in Paris. The notebook in which the name first appears is still highly radioactive and dangerous. The name comes from the Latin word radius, meaning 'ray'. Radium is a brilliant white, luminescent, rare and highly radioactive metallic element. A few days before the Christmas of 1898, Pierre Curie scrawled the word 'radium' in his notebook as the name for a new element he and his wife Marie had brought laboriously to light in their ramshackle laboratory in Paris.
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