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07 November 2017

The Great Invention of Marie Curie

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When in 1995 the remains of the French-Polish scientist Marie Curie (7 November 1867 – 4 July 1934) were exhumed from the Sceaux cemetery to be transferred to the Pantheon in Paris, it was feared that they would emit harmful levels of radiation, such as still occurs today with her laboratory notebooks. But there was no radium in the remains, which suggested that the disease that killed the researcher was not due to the radioactive elements that she handled, but rather to an excessive exposure to X-rays caused by her unusual invention: the mobile radiology machine that she took to the battlefields during the First World War.

The achievements of Curie and her husband Pierre, who died in 1906, are well known. The discovery of radium and polonium allowed us to define the properties of radioactivity, a term coined by the researcher herself. The finding that elements such as uranium emitted radiation was joined in the same period with the discovery of the electron, which proved that the atom was not indivisible as was believed. For all this Marie Curie received not one Nobel Prize, but two, being the first person to achieve this and the only one who has ever done so in two different scientific disciplines—physics and chemistry.

Less well known, though equally well documented, is Curie’s work during the First World War, inspired by her humanitarian spirit and devotion to her host country. With the outbreak of conflict and the threat of a German invasion looming over Paris, daily life was suspended, including Curie’s research. The French government moved to Bordeaux, where the scientist also brought her most precious treasured, a gram of radium in a lead-lined container, which she left in a safety deposit box at a local bank.

Marie Curie in her laboratory. Source: Wikimedia

But unlike others, Curie did not seek refuge in Bordeaux, but decided to return to Paris. Eager to contribute to the war effort, she bought war bonds and wanted to donate to the government the gold medals from her two Nobel prizes, a gift that was not accepted. Instead, she chose to put her science at the service of the French army.

Radiology in the front lines

Curie knew that reaction time was critical to treating wounded troops on the battlefield, but military doctors were forced to work with meagre resources. In particular, X-rays had become an enormously useful tool for surgeons since their discovery by Wilhelm Röntgen in 1895, but the machines were only available in large hospitals. Curie set out to bring radiology to the front lines in cars that housed portable X-ray machines.

It was not an easy endeavour. To begin with, Curie was a researcher, not a physician. She was unaware of the clinical management of X-rays, and did not even know how to drive. Not only did she have to learn radiology, but also how to change a tire and clean a carburettor. To equip her first vehicle, she had the help of the Union of Women of France and the Red Cross, as the government’s bureaucratic obstacles were excessive. Naomi Pasachoff, a science historian at Williams College and author of Marie Curie and the Science of Radioactivity (Oxford University Press, 1997), points out to OpenMind that Curie’s status as a woman did not make things easy for her: “Curie had to set the radiological service up by herself, without the support of the government. Presumably, anti-female bias played a role, if not the only role, in that situation.”

Curie was able to equip 20 vehicles with portable X-ray machines. Source: Wikimedia

Despite all the difficulties, Curie managed to equip her first car, converted into a truck. As explained to OpenMind by Timothy J. Jorgensen, Radiation Biology Specialist at Georgetown University (USA) and author of Strange Glow: The Story of Radiation (Princeton University Press, 2016), “the portable X-ray machines that Curie used in her cars were actually invented by a Spaniard, Mónico Sánchez Moreno. She produced the X-rays from Crookes tubes, which require a source of electricity.” For this, Curie connected a dynamo to the petroleum-powered engine of the vehicle, which also contained photographic material and darkroom equipment to develop the plates.

The first truck was prepared to transport the famous scientist herself to the front line at the Battle of Marne (1914). But that was just the beginning. Over time and with the support of wealthy friends, Curie was able to equip 20 vehicles and to train, with the help of her daughter Irene, 150 female volunteers who were put in charge of operating these mobile units. It is estimated that the fleet of trucks, which soon became known as Petites Curies (Little Curies), as well as the 200 fixed radiology units that the scientist distributed to field hospitals, allowed more than one million wounded soldiers to be treated.

The scientist distributed 200 fixed radiology units to field hospitals. Source: Wikimedia

That work would leave a mark on the health of the scientist who would pay a price over the years. “Curie was aware that high doses of radiation could be dangerous. But there was little she could do to limit exposures on the battlefield,” says Jorgensen. “The risk of X-rays seemed trivial compared to that of combat.”

A lead coffin

In 1920, the health of Curie began to deteriorate, until 1934 when she died from aplastic anaemia. Her body was buried in a lead coffin, and for decades it was presumed that radium contamination caused her death. But when scientists failed to find dangerous levels of radium in her remains in 1995, the French Office of Ionizing Radiation Protection concluded that: “Curie could not have been exposed to lethal levels of radium while she was alive,” Nature magazine reported. The same experts suggested that: “Curie’s illness was more likely to have been due to her use of radiography during the First World War.”

150 female volunteers were put in charge of operating the mobile units. Source: Wikimedia
 And yet, as Pasachoff points out, at the end of the war the French government officially recognized the contribution of her daughter Irene, but not that of Marie herself. The historian suggests that perhaps her country of adoption had not yet forgiven the scandal that Curie generated in 1911 when she entered into a love affair with a married man, the physicist Paul Langevin, a former student of Pierre Curie.

But it seems that Curie was not particularly interested in awards. In fact, years later she rejected the Order of the Legion of Honour, as her husband had done earlier. She never wanted to leave any medals behind; instead, from her Radium Institute she dedicated the rest of her life to developing her legacy for humanity, a therapy that today continues to save lives. “Radiotherapy has saved many people from dying of cancer, and for those it cannot save, it has prolonged their life and reduced their pain,” Jorgensen concludes.

Javier Yanes


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