Physicist who proposed the use of fast protons for radiation therapy in 1946.[ref]
Figure 1.
Portrait of Robert R. Wilson
. Fermilab History and Archives, 12 September 1970; original photographer unidentified; crop by FMSky. Public domain (PD-USGov-DOE), as documented on the linked Commons file page. Source.

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Figure 1. . Photograph by CA2MI, dedicated under CC0; file source and credit. Source.

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Figure 1.
Portrait of Victor Weisskopf
. GFHund; photograph from Friedrich Hund’s estate, prepared for Wikipedia in August 2010. CC BY 3.0, via Wikimedia Commons. Source.
Figure 1.
Portrait of Gregory Breit
. From the National Academy of Sciences biographical memoir of Gregory Breit; photographer not identified on Commons. Attribution-only permission stated on the Commons file page, via Wikimedia Commons. Source.

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Figure 1.
William Bertozzi, portrait from his MIT Physics profile
.

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Figure 1.
Portrait of James Rainwater
. Keystone. Public domain in the United States (publication without copyright notice, as stated on Commons). Source usage terms, via Wikimedia Commons. Source.

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Figure 1.
Portrait of Ben Roy Mottelson
. GFHund, July 1963; existing Commons grayscale and noise adjustments by Materialscientist. CC BY 3.0, via Wikimedia Commons. Source.

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Figure 1.
Portrait of Eugene Wigner
. Nobel Foundation. Public domain in Sweden per Commons PD-Sweden photo tag; separate U.S. status tag not present on inspected File. Source usage terms, via Wikimedia Commons. Source.
Figure 1.
Portrait of J. Hans D. Jensen
. Nobel Foundation. Public domain in Sweden per Commons PD-Sweden photo tag; separate U.S. status tag not present on inspected File. Source usage terms, via Wikimedia Commons. Source.

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Figure 1.
Portrait of Robert Hofstadter
. Nobel Foundation, 1961 Nobel portrait; individual photographer unspecified. Public domain in Sweden according to the Commons Swedish-photograph template. Source usage terms, via Wikimedia Commons. Source.

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Figure 1. . National Archives / Department of Energy archive creator; original photographer not separately identified. Photograph dated 1934. Commons records public-domain status on the basis of NARA’s use restrictions being Unrestricted., via Wikimedia Commons. Source.

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Figure 1.
Portrait of Emilio Segrè
. Photolab; LBL Collection; 28 April 1954. Public domain in the United States: publication without copyright notice (PD-US-no-notice). Source usage terms, via Wikimedia Commons. Source.

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Figure 1.
Portrait of Edoardo Amaldi
. Unknown photographer (Mondadori Publishers), 1960; existing Commons crop by Materialscientist. Public domain in Italy (PD-Italy simple photograph, expired term). Source usage terms, via Wikimedia Commons. Source.

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Figure 1. . Studio Harcourt / Wellcome Collection, via Wikimedia Commons. Public domain in France and the United States according to the actual File page’s PD-France and PD-1996 licensing declarations; attribution retained. Source usage terms, via Wikimedia Commons. Source.

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Figure 1.
Portrait of James Chadwick
. Los Alamos National Laboratory. Unless otherwise indicated, this information has been authored by an employee or employees of the Los Alamos National Security, LLC (LANS), operator of the Los Alamos National Laboratory under Contract No. DE-AC52-06NA25396 with the U.S. Department of Energy. The U.S. Government has rights to use, reproduce, and distribute this information. The public may copy and use this information without charge, provided that this Notice and any statement of authorship are reproduced on all copies. Neither the Government nor LANS makes any warranty, express or implied, or assumes any liability or responsibility for the use of this information. Los Alamos National Laboratory attribution permission, via Wikimedia Commons. Source.

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A physicist whose uranium experiments helped establish radioactivity. His 1896 photographic plate tests separated exposure to the material from immediate illumination; the cautious interpretation in his report is part of the story of Becquerel's uranium-radiation experiment. He held the chair of applied physics at the Paris Museum of Natural History.[ref]

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A physicist and chemist whose investigation of radioactivity joined sensitive measurement to chemical separation. She moved from Warsaw to Paris to study, later becoming a professor of physics. The Curie ionization-current measurement shows the experimental craft behind the work: balancing a tiny electric current against a calibrated electric charge. She shared the 1903 Nobel Prize in Physics and received the 1911 prize in chemistry.[ref]

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A physicist who investigated magnetism, piezoelectricity and radioactivity. He built delicate balances, electrometers and piezoelectric crystals; this work on instruments helped make weak electrical effects measurable. With Marie Curie, he investigated radioactive substances under difficult laboratory conditions. The Curie ionization-current measurement illustrates how such instrumentation can turn a small signal into a quantitative comparison.[ref]

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