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Portrait of Georges Charpak
Photo: CHARPAK_Georges-24x50-2005.jpg: Studio Harcourt derivative work: Spatulli (talk), CHARPAK_Georges-24x50-2005.jpg · CC BY 3.0 via Wikimedia Commons

Nobel Prize in Physics · 1992

Georges Charpak

A Dachau survivor, he strung hair-thin wires into detectors that let physicists catch rare particles and doctors use gentler X-rays.

The Nobel citation: “for his invention and development of particle detectors, in particular the multiwire proportional chamber”
Born
August 1, 1924, Dabrovica, Poland
Died
September 29, 2010, Paris, France
Affiliation at the time
École Supérieure de Physique et Chimie, France; CERN, Switzerland

Physics prize

1992

Awarded alone.

Age that year

68years

Born in 1924.

Headline credited impact

320,000–900,000people benefited

Patients imaged with EOS X-ray scanners that use Charpak's gas detector (excluding the newer EOSedge). How it was built

Sources cited

25

Fact-checked September 24, 2026.

  • He survived Dachau, where he was held as a Resistance fighter. A CERN colleague wrote that he lived because the guards never realized their political prisoner was Jewish.
  • His wire chamber, linked to a computer, could record up to a million particle tracks a second. The bubble chambers it replaced took about one photograph a second.
  • Through 2025 he is the last person to win the Nobel Prize in Physics alone. Every physics prize since 1993 has been shared.
  • At the Nobel banquet he joked that the official photographer called him his 137th laureate, a number physicists treat as almost magical.
  • He co-founded La main à la pâte, which brought hands-on science into French primary schools and has worked with more than 50 countries.

The breakthrough

The multiwire proportional chamber: electronic eyes for particle tracks (1968)

When particles smash together in an accelerator, they spray out new particles far too small to see. Physicists work out what happened by tracing each particle's path. In the 1960s the leading tools, bubble and spark chambers, recorded tracks on photographs, and people had to study the film by hand. A bubble chamber managed about one picture a second, and a spark chamber could fire at most about 100 times a second. That made rare events, sometimes one collision in a billion, very hard to catch. In 1968 at CERN, Charpak built a flat box of gas crossed by a row of hair-thin wires a millimetre or two apart, set between two metal sheets at high voltage. A charged particle passing through knocks electrons out of gas atoms. Near a wire they speed up and knock out more, an avalanche that sends a tiny electric pulse down that one wire. Most physicists expected closely spaced wires to confuse each other's signals; Charpak showed that each wire works as its own independent counter. Give every wire a small amplifier, stack several chambers, and a computer can read off the particle's path directly, with no film. Think of swapping a camera that takes one snapshot a second for a grid of tripwires that report instantly. Data collection sped up about a thousandfold. Timing how long the electrons take to drift to a wire gave even sharper positions, the idea behind the drift chamber.[3],[6],[8],[9]

“My very modest contribution to physics has been in the art of weaving in space thin wires detecting the whisper of nearby flying charged particles”
Georges Charpak, Nobel Banquet speech, Stockholm, 10 December 1992, describing his wire chambers. He went on to say such detectors could greatly cut X-ray doses for patients, and urged investment in future particle accelerators.[5]

What it meant for humanity

The wire chamber changed how particle physics is done. Because it fed data straight to computers, physicists could run collisions much faster and sift huge numbers of events for the rare ones that matter. By 1992, the Nobel announcement said, practically every particle physics experiment used a track detector descended from it. Wire chambers helped find the charm quark in 1974 and the W and Z particles in 1983, and colleagues wrote that the top quark's discovery at Fermilab also depended on this family of detectors. Its offspring, such as the drift chamber and the time-projection chamber, still record collisions today, including at CERN's Large Hadron Collider. Charpak spent much of his later career bringing the same idea to biology and medicine. His gas detectors could map radioactive tracers in a slice of tissue in about a day, work that took three months on photographic film. In 1989 he founded Biospace, whose descendant, EOS imaging, built an upright X-ray scanner around his gas detector. It images the whole skeleton from the front and side at once, for problems such as scoliosis, at a fraction of the usual dose. A Montreal study of 50 patients found skin doses 6 to 9 times lower than a standard digital system, and a later microdose mode cut exposure more than fivefold again. That matters most for children, who are more sensitive to radiation and often need repeat scans. The company says its machines now perform more than a million exams a year, though its newest model, EOSedge, uses a different kind of detector. Charpak also spent his fame on others. He helped found a CERN committee that campaigned for jailed Soviet scientists, co-wrote books on nuclear arms control and against pseudoscience, and co-founded La main à la pâte, which brought hands-on science into French primary classrooms.

  • The 1992 Nobel announcement said wire chambers sped up data collection about a thousandfold, and that practically every particle physics experiment used a track detector developed from Charpak's invention.[3]
  • Multiwire chambers were used in the 1974 discovery of the charm quark and the 1983 discovery of the W and Z particles at CERN, both honored with Nobel Prizes.[3],[8]
  • In a 50-patient Montreal study, the EOS scanner, built around Charpak's gas detector, cut skin doses 6 to 9 times compared with a standard digital X-ray system. A later microdose mode cut exposure a further 5.5 times.[17],[18],[19]
  • In his Nobel lecture he showed a gas detector that mapped a radioactive tracer in a slice of rat kidney in about a day. The same picture on photographic film had taken three months.[6]
  • La main à la pâte grew from 350 classes to more than a thousand in its second year. In 2000 France's education minister adopted its approach for all schoolchildren, and it has since worked with more than 50 countries.[24]
  • In 1980 he was a founding member of the Yuri Orlov committee set up by CERN physicists, which campaigned for jailed Soviet scientists and dissidents including Orlov, Anatoly Shcharansky and Andrei Sakharov.[8],[9]

Impact in numbers

Charpak's main gift was a new way of seeing. The multiwire chamber and its descendants turned particle physics into a computer-driven science able to hunt for one-in-a-billion events, and they sit behind several Nobel-winning discoveries. That value is real, but it cannot honestly be turned into lives or dollars, so we make no numerical claim for it. We make one modest, low-confidence claim for the EOS low-dose X-ray scanner, the clearest medical descendant of his detectors, counting patients imaged at reduced radiation dose. The benefit to each patient is a lower cancer risk from repeated scans, which we do not try to convert into lives saved. His other legacies are harder to count: gas-detector imaging tools for biology labs, La main à la pâte, which changed how many French primary schools teach science and spread abroad, and his campaigns for imprisoned scientists and for nuclear arms control.

Fundamental scienceHealthTechnologyEducationHuman rights

Each number is the laureate’s credited share of a real-world outcome, cumulative to 2025. The whole outcome, the share of credit, and the reasoning are shown so you can check the arithmetic. Outcomes shared with other laureates are counted once on the impact page.

  • Low confidenceDirectModeledHealth

    Patients imaged with EOS X-ray scanners that use Charpak's gas detector (excluding the newer EOSedge)

    320,000–900,000

    people benefited, credited share

    That is 20% of 1.6–4.5 million people benefited since 2008.

    How this number was built

    Counts only gas-detector EOS systems; EOSedge (85% of 2020 orders) uses a photon-counting detector and is excluded. Installed base: 308 (end 2018), 359 (2019), 402 (2020) per company reports; about 100 at end 2014 (359/1.29^5, reported 29% yearly growth); first installs 2008. Yearly averages give about 1,750 system-years for 2008-2020; add 300-370 gas-detector systems a year for 2021-2025 (1,500-1,850). Total 3,250-3,600. Company reports over 1M exams/yr on about 500 systems (about 2,000 each); at 1,500-2,500 per system-year: 3,250 x 1,500 = 4.9M to 3,600 x 2,500 = 9.0M exams. At 2-3 exams per patient: 4.9M/3 = 1.6M to 9.0M/2 = 4.5M people. Share 0.2: Charpak invented the detector and founded the company, but 3D reconstruction came from ENSAM and ETS Montreal and others built the system. Volumes are self-reported.[17],[18],[21],[22],[23],[25]

    Sources: EOS imaging (ATEC Spine group); EOS imaging; EOS imaging; Bulletin de l'Académie nationale de médecine (PubMed abstract); Spine (PubMed abstract); EOS imaging

The double edge

We found no documented harms from Charpak's detectors. They are tools for seeing radiation, and in medicine their main effect has been to lower the dose patients receive. The trade-offs we found are practical ones: a Zurich hospital reported that the EOS scanner cut radiation and exam time but was noisier for patients and needed more exams a year to pay for itself than a standard X-ray room.

  • Minor

    Low-dose scanner is costlier to run and noisier

    A 2013 study at Zurich's Balgrist hospital found the EOS system gave lower doses and shorter exams than standard digital radiography, but patients rated it noisier, and it needed about 4,077 scans a year to break even versus 2,602 for the standard system.[20]

Against the odds

Charpak's early life ran through two of the century's worst places to be Jewish. He was born in Sarny, a mostly Jewish railway town in eastern Poland where, he wrote, being born Jewish was a handicap. After about two years in Palestine, the family reached Paris around 1931 as undocumented immigrants and lived modestly. France had been one of Europe's more open countries for Jewish immigrants, but after its 1940 defeat the Vichy regime shut Jews out of public life, and French police helped round up Jews for deportation, foreign-born Jews especially. Some 77,000 Jews in France died. Warned the day before the July 1942 Vél d'Hiv roundup, the Charpaks fled Paris under a false name, while a cousin's family who could not leave was deported. In Montpellier, at 18, Charpak joined the Resistance. Vichy police arrested him in 1943, and in 1944 he was deported to Dachau. A colleague wrote that he survived because the guards never realized their political prisoner was Jewish. He later said physics helped him bury the worst memories. The town of his birth did not survive: in August 1942 German forces and Ukrainian police emptied the Sarny ghetto, herded its Jews and those of nearby towns, including Dąbrowica, into a fenced camp, and shot them at pits in a nearby forest. One survivor put the number at about 14,000.

  • 1924

    Discrimination

    He said he was really born in Sarny, a mostly Jewish town where being born Jewish was a handicap. His parents registered the birth in nearby, more mixed Dąbrowica, hoping he would be less marked as Jewish.[11]

  • 1931

    Poverty

    After about two years in Palestine, the family reached Paris as undocumented immigrants. His father delivered herring for a butcher in the Jewish quarter, and his mother took in sewing.[14]

  • 1942

    Persecution

    Warned by a friend whose father was a policeman, the family fled Paris just before the July 1942 Vél d'Hiv roundup, using false papers in the name Charpentier. His younger brother was placed with a family linked to the children's aid society OSE.[11],[13],[15]

  • 1942

    Family killed

    His cousin's family, the Frydmanns, could not get away in time and were all deported. Only his cousin Janine survived Auschwitz.[11]

  • 1943

    Imprisonment

    Arrested by Vichy's French police in Montpellier for Resistance work, he was sentenced by a special court to two years in prison for 'communist activities' and held in Montpellier and at the Eysses central prison.[11],[13]

  • 1944

    Imprisonment

    Handed over to the Germans in May 1944, he was deported to Dachau as prisoner 73251, did forced labour building a runway at Landsberg am Lech, survived a death march in April 1945, and was freed at Allach on 30 April 1945.[8],[11],[12]

  • 1942

    Other

    In August 1942 German forces and Ukrainian police liquidated the ghetto of Sarny, his birthplace. Its Jews and those of nearby towns, including Dąbrowica, were herded into a fenced camp and shot at pits in a nearby forest. One survivor put the number at about 14,000.[16]

  • —

    Persecution

    His mother was held for about a year in the Brens internment camp in southern France after smuggling him a message in a parcel while he was in prison in Montpellier.[11]

Jewish background

Both parents JewishIdentified as Jewish, secular

Charpak was born to Jewish parents, Mordko Charpak and Chana Szapiro, and grew up in a Yiddish-speaking home; he later wrote that his family were above all Jews. As a young man he was secular and joined the Communist movement, and for decades he kept his Jewish roots in the background. A Paris Jewish-memory group says a 1992 visit to its exhibition moved him deeply; afterward he wrote the preface to its book and joined its honorary committee. In 2000 he became honorary president of the association preserving the Brens camp, where his mother had been interned during the war.[11],[13],[14]

Key dates

  1. August 1, 1924

    Born Hersz (Georges) Charpak to Jewish parents, officially in Dąbrowica, Poland (now Ukraine); he said he was really born on 8 March in nearby Sarny.[1],[2],[11]

  2. 1931

    After about two years in Palestine, the family settles in Paris (sources give 1931 or 1932). He learns French fast in the local state school.[8],[10],[11],[14]

  3. 1942

    Warned of the Vél d'Hiv roundup, the family flees Paris on false papers. In Montpellier he continues university-prep math classes as 'Charpentier'.[1],[11],[13]

  4. 1943

    Joins the Communist-led FTP Resistance, passes the École des Mines entrance exam under his real name, and is arrested by Vichy police.[11],[13]

  5. 1944

    Handed to the Germans and deported from Compiègne to Dachau as prisoner 73251, then sent to forced labour at Landsberg am Lech.[11],[12]

  6. April 30, 1945

    Freed at Allach, a Dachau subcamp, after a death march. He returns to Paris in May and soon enters the École des Mines.[1],[11],[12]

  7. 1948

    Graduates as a mining engineer, a French citizen since 1946, and joins the CNRS in Frédéric Joliot-Curie's lab at the Collège de France.[1],[8],[9]

  8. 1954

    Earns his PhD in nuclear physics at the Collège de France.[1],[8],[9]

  9. 1959

    Joins CERN in Geneva, where he soon helps make the first precise measurement of the muon's magnetic moment.[1],[8],[9]

  10. 1968

    Publishes the multiwire proportional chamber, read out wire by wire by electronics and computers, and points the way to the drift chamber.[3],[6],[8]

  11. 1989

    Founds Biospace to turn his detectors into biomedical imaging tools, the start of the company behind the low-dose EOS X-ray scanner.[8],[21]

  12. December 10, 1992

    Receives the unshared Nobel Prize in Physics. Through 2025 it remains the last physics prize awarded to a single person.[2],[4],[7]

  13. 1996

    With Pierre Léna, Yves Quéré and the French Academy of Sciences, launches La main à la pâte in French primary classrooms.[8],[10],[24]

  14. September 29, 2010

    Dies in Paris at 86.[1],[2],[8]

Sources

  1. 1.Georges Charpak - Biographical (CV) · NobelPrize.org (from Les Prix Nobel 1992), 1993
  2. 2.Georges Charpak - Facts · NobelPrize.org (Nobel Prize Outreach)
  3. 3.Press release: The Nobel Prize in Physics 1992 (14 October 1992) · Royal Swedish Academy of Sciences / NobelPrize.org, 1992
  4. 4.Award ceremony speech, Nobel Prize in Physics 1992 (Professor Carl Nordling) · NobelPrize.org, 1992
  5. 5.Georges Charpak - Banquet speech (Stockholm, 10 December 1992) · NobelPrize.org, 1992
  6. 6.Electronic Imaging of Ionizing Radiation with Limited Avalanches in Gases (Nobel Lecture, 8 December 1992) · NobelPrize.org, 1992
  7. 7.Nobel Prize API: Nobel Prizes in Physics 1990-2025 with laureate prize shares · Nobel Prize Outreach
  8. 8.Georges Charpak - a true man of science (by Ioannis Giomataris) · CERN Courier, 2010
  9. 9.Georges Charpak (obituary) · Physics Today (AIP), 2011
  10. 10.Tel était Georges Charpak (tribute by Yves Quéré, MINES Revue des Ingénieurs no. 450) · Annales des Mines, 2010
  11. 11.Charpak Georges alias Jacques Charpentier: biographical file (drawing on his memoir La vie à fil tendu and SHD records) · Amis de la Fondation pour la Mémoire de la Déportation, Loire-Atlantique (AFMD 44)
  12. 12.CHARPAK Georges: deportation record (Mémorial virtuel des déporté.es de Loire-Atlantique) · Amis de la Fondation pour la Mémoire de la Déportation, Loire-Atlantique (AFMD 44)
  13. 13.Georges Charpak (biographical note) · Musée de la Résistance en ligne, Fondation de la Résistance
  14. 14.Georges Charpak, un homme bien nous quitte, à 86 ans (by Marcel Apeloig), Mémoire Juive de Paris bulletin no. 23 · Mémoire Juive de Paris (hosted by the Mémorial de la Shoah), 2010
  15. 15.France (Holocaust Encyclopedia) · United States Holocaust Memorial Museum
  16. 16.The Ghetto - the Beginning of the End (by Zvi Pearlstein), in the Sarny memorial book (Sefer yizkor le-kehilat Sarny, 1961), English translation · JewishGen Yizkor Book Project, 1961
  17. 17.A new 2D and 3D imaging approach to musculoskeletal physiology and pathology with low-dose radiation and the standing position: the EOS system (Dubousset, Charpak et al., Bull Acad Natl Med 189:287-297) · Bulletin de l'Académie nationale de médecine (PubMed abstract), 2005
  18. 18.Diagnostic imaging of spinal deformities: reducing patients radiation dose with a new slot-scanning X-ray imager (Deschênes et al., Spine 35:989-994) · Spine (PubMed abstract), 2010
  19. 19.EOS microdose protocol for the radiological follow-up of adolescent idiopathic scoliosis (Ilharreborde et al., Eur Spine J 25:526-531) · European Spine Journal (PubMed abstract), 2016
  20. 20.Comparison of radiation dose, workflow, patient comfort and financial break-even of standard digital radiography and a novel biplanar low-dose X-ray system (Dietrich et al., Skeletal Radiol 42:959-967) · Skeletal Radiology (PubMed abstract), 2013
  21. 21.About EOS imaging · EOS imaging (ATEC Spine group)
  22. 22.EOS imaging 2019 Annual Financial Report (English translation) · EOS imaging, 2020
  23. 23.EOS imaging reports its Full Year 2020 Results and First Quarter 2021 Revenues (press release) · EOS imaging, 2021
  24. 24.History of the Fondation La main à la pâte · Fondation La main à la pâte
  25. 25.EOSedge · EOS imaging

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