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href="https://de.wikipedia.org/wiki/Harry_Daghlian" title="Harry Daghlian – German" lang="de" hreflang="de" data-title="Harry Daghlian" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Harry_Daghlian" title="Harry Daghlian – Spanish" lang="es" hreflang="es" data-title="Harry Daghlian" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D9%87%D8%B1%DB%8C_%DA%A9%DB%8C._%D8%AF%D8%A7%D8%BA%D9%84%DB%8C%D8%A7%D9%86" title="هری کی. داغلیان – Persian" lang="fa" hreflang="fa" data-title="هری کی. داغلیان" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Harry_Daghlian_Jr." title="Harry Daghlian Jr. – French" lang="fr" hreflang="fr" data-title="Harry Daghlian Jr." data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%ED%95%B4%EB%A6%AC_K._%EB%8D%94%EA%B7%B8%ED%9E%90%EB%9E%80" title="해리 K. 더그힐란 – Korean" lang="ko" hreflang="ko" data-title="해리 K. 더그힐란" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D5%80%D5%A1%D6%80%D6%80%D5%AB_%D4%B4%D5%A1%D5%B2%D5%AC%D5%B5%D5%A1%D5%B6" title="Հարրի Դաղլյան – Armenian" lang="hy" hreflang="hy" data-title="Հարրի Դաղլյան" data-language-autonym="Հայերեն" data-language-local-name="Armenian" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Harry_Daghlian" title="Harry Daghlian – Indonesian" lang="id" hreflang="id" data-title="Harry Daghlian" data-language-autonym="Bahasa Indonesia" data-language-local-name="Indonesian" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Harry_Daghlian" title="Harry Daghlian – Italian" lang="it" hreflang="it" data-title="Harry Daghlian" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-arz mw-list-item"><a href="https://arz.wikipedia.org/wiki/%D9%87%D8%A7%D8%B1%D9%89_%D9%83.%D8%AF%D8%A7%D8%AC%D9%84%D9%8A%D8%A7%D9%86_%D8%A7%D9%84%D8%A7%D8%A8%D9%86." title="هارى ك.داجليان الابن. – Egyptian Arabic" lang="arz" hreflang="arz" data-title="هارى ك.داجليان الابن." data-language-autonym="مصرى" data-language-local-name="Egyptian Arabic" class="interlanguage-link-target"><span>مصرى</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E3%83%8F%E3%83%AA%E3%83%BC%E3%83%BB%E3%83%80%E3%83%AA%E3%82%A2%E3%83%B3" title="ハリー・ダリアン – Japanese" lang="ja" hreflang="ja" data-title="ハリー・ダリアン" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Harry_Daghlian" title="Harry Daghlian – Polish" lang="pl" hreflang="pl" data-title="Harry Daghlian" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Harry_Daghlian" title="Harry Daghlian – Portuguese" lang="pt" hreflang="pt" data-title="Harry Daghlian" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Harry_Daghlian" title="Harry Daghlian – Romanian" lang="ro" hreflang="ro" data-title="Harry Daghlian" data-language-autonym="Română" data-language-local-name="Romanian" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru badge-Q17437798 badge-goodarticle mw-list-item" title="good article badge"><a href="https://ru.wikipedia.org/wiki/%D0%94%D0%B0%D0%B3%D0%BB%D1%8F%D0%BD,_%D0%93%D0%B0%D1%80%D1%80%D0%B8" title="Даглян, Гарри – Russian" lang="ru" hreflang="ru" data-title="Даглян, Гарри" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Harry_K._Daghlian" title="Harry K. Daghlian – Finnish" lang="fi" hreflang="fi" data-title="Harry K. Daghlian" data-language-autonym="Suomi" data-language-local-name="Finnish" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Harry_Daghlian" title="Harry Daghlian – Turkish" lang="tr" hreflang="tr" data-title="Harry Daghlian" data-language-autonym="Türkçe" data-language-local-name="Turkish" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%93%D0%B0%D1%80%D1%80%D1%96_%D0%94%D0%B0%D0%B3%D0%BB%D1%8F%D0%BD" title="Гаррі Даглян – Ukrainian" lang="uk" hreflang="uk" data-title="Гаррі Даглян" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Harry_K._Daghlian,_Jr." title="Harry K. 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data-mw-deduplicate="TemplateStyles:r1257001546">.mw-parser-output .infobox-subbox{padding:0;border:none;margin:-3px;width:auto;min-width:100%;font-size:100%;clear:none;float:none;background-color:transparent}.mw-parser-output .infobox-3cols-child{margin:auto}.mw-parser-output .infobox .navbar{font-size:100%}@media screen{html.skin-theme-clientpref-night .mw-parser-output .infobox-full-data:not(.notheme)>div:not(.notheme)[style]{background:#1f1f23!important;color:#f8f9fa}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox-full-data:not(.notheme) div:not(.notheme){background:#1f1f23!important;color:#f8f9fa}}@media(min-width:640px){body.skin--responsive .mw-parser-output .infobox-table{display:table!important}body.skin--responsive .mw-parser-output .infobox-table>caption{display:table-caption!important}body.skin--responsive .mw-parser-output .infobox-table>tbody{display:table-row-group}body.skin--responsive .mw-parser-output .infobox-table tr{display:table-row!important}body.skin--responsive .mw-parser-output .infobox-table th,body.skin--responsive .mw-parser-output .infobox-table td{padding-left:inherit;padding-right:inherit}}</style><table class="infobox biography vcard"><tbody><tr><th colspan="2" class="infobox-above" style="font-size:125%;"><div class="fn">Harry Daghlian</div></th></tr><tr><td colspan="2" class="infobox-image"><span class="mw-default-size" typeof="mw:File/Frameless"><a href="/wiki/File:Harry-K-Daghlian.gif" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4d/Harry-K-Daghlian.gif/220px-Harry-K-Daghlian.gif" decoding="async" width="220" height="282" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/4/4d/Harry-K-Daghlian.gif 1.5x" data-file-width="250" data-file-height="320" /></a></span><div class="infobox-caption">Daghlian <abbr title="circa">c.</abbr><span style="white-space:nowrap;"> 1944</span></div></td></tr><tr><th scope="row" class="infobox-label">Born</th><td class="infobox-data"><div style="display:inline" class="nickname">Haroutune Krikor Daghlian Jr.</div><br /><span style="display:none">(<span class="bday">1921-05-04</span>)</span>May 4, 1921<br /><div style="display:inline" class="birthplace"><a href="/wiki/Waterbury,_Connecticut" title="Waterbury, Connecticut">Waterbury, Connecticut</a>, U.S.</div></td></tr><tr><th scope="row" class="infobox-label">Died</th><td class="infobox-data">September 15, 1945<span style="display:none">(1945-09-15)</span> (aged 24)<br /><div style="display:inline" class="deathplace"><a href="/wiki/Los_Alamos,_New_Mexico" title="Los Alamos, New Mexico">Los Alamos, New Mexico</a>, U.S.</div></td></tr><tr><th scope="row" class="infobox-label">Cause of death</th><td class="infobox-data"><a href="/wiki/Acute_radiation_syndrome" title="Acute radiation syndrome">Acute radiation syndrome</a></td></tr><tr><th scope="row" class="infobox-label">Resting place</th><td class="infobox-data label"><a href="/wiki/Cedar_Grove_Cemetery_(New_London,_Connecticut)" title="Cedar Grove Cemetery (New London, Connecticut)">Cedar Grove Cemetery</a></td></tr><tr><th scope="row" class="infobox-label">Education</th><td class="infobox-data"><a href="/wiki/Massachusetts_Institute_of_Technology" title="Massachusetts Institute of Technology">Massachusetts Institute of Technology</a><br /><a href="/wiki/Purdue_University" title="Purdue University">Purdue University</a> (<a href="/wiki/Bachelor_of_Science" title="Bachelor of Science">BS</a>)</td></tr><tr><th scope="row" class="infobox-label">Occupation</th><td class="infobox-data role"><a href="/wiki/Physicist" title="Physicist">Physicist</a></td></tr></tbody></table> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Herbert_Lehr_and_Haroutune_Krikor_Daghlian,_Jr._(a.k.a._Harry_Daghlian)_with_assembled_tamper_plug_containing_the_plutonium_pit_and_initiator_for_transport_to_the_shot_tower_on_13_July_1945._LA-Loading_components_(34823045643)_(cropped).jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a6/Herbert_Lehr_and_Haroutune_Krikor_Daghlian%2C_Jr._%28a.k.a._Harry_Daghlian%29_with_assembled_tamper_plug_containing_the_plutonium_pit_and_initiator_for_transport_to_the_shot_tower_on_13_July_1945._LA-Loading_components_%2834823045643%29_%28cropped%29.jpg/170px-thumbnail.jpg" decoding="async" width="170" height="214" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a6/Herbert_Lehr_and_Haroutune_Krikor_Daghlian%2C_Jr._%28a.k.a._Harry_Daghlian%29_with_assembled_tamper_plug_containing_the_plutonium_pit_and_initiator_for_transport_to_the_shot_tower_on_13_July_1945._LA-Loading_components_%2834823045643%29_%28cropped%29.jpg/255px-thumbnail.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a6/Herbert_Lehr_and_Haroutune_Krikor_Daghlian%2C_Jr._%28a.k.a._Harry_Daghlian%29_with_assembled_tamper_plug_containing_the_plutonium_pit_and_initiator_for_transport_to_the_shot_tower_on_13_July_1945._LA-Loading_components_%2834823045643%29_%28cropped%29.jpg/340px-thumbnail.jpg 2x" data-file-width="765" data-file-height="961" /></a><figcaption>Herbert Lehr (left) and Harry Daghlian Jr. (right), loading the assembled <a href="/wiki/Tamper_(nuclear_weapon)" title="Tamper (nuclear weapon)">tamper</a> plug containing the plutonium pit and initiator into a car for transport from the <a href="/wiki/McDonald_Ranch_House" title="McDonald Ranch House">McDonald ranch house</a> to <a href="/wiki/Trinity_(nuclear_test)" title="Trinity (nuclear test)">the shot tower</a> on July 13, 1945.</figcaption></figure> <p><b>Haroutune Krikor Daghlian Jr.</b> (May 4, 1921 – September 15, 1945) was an American <a href="/wiki/Physicist" title="Physicist">physicist</a> with the <a href="/wiki/Manhattan_Project" title="Manhattan Project">Manhattan Project</a>, which designed and produced the <a href="/wiki/Atomic_bomb" class="mw-redirect" title="Atomic bomb">atomic bombs</a> that were used in <a href="/wiki/World_War_II" title="World War II">World War II</a>. He accidentally <a href="/wiki/Irradiation" title="Irradiation">irradiated</a> himself on August 21, 1945, during a <a href="/wiki/Critical_mass" title="Critical mass">critical mass</a> experiment at the remote Omega Site of the <a href="/wiki/Los_Alamos_Laboratory" class="mw-redirect" title="Los Alamos Laboratory">Los Alamos Laboratory</a> in <a href="/wiki/New_Mexico" title="New Mexico">New Mexico</a> and died 25 days later from the resultant <a href="/wiki/Radiation_poisoning" class="mw-redirect" title="Radiation poisoning">radiation poisoning</a>. </p><p>Daghlian was irradiated as a result of a <a href="/wiki/Criticality_accident" title="Criticality accident">criticality accident</a> that occurred when he accidentally dropped a <a href="/wiki/Tungsten_carbide" title="Tungsten carbide">tungsten carbide</a> brick onto a 6.2 kg <a href="/wiki/Pit_(nuclear_weapon)" title="Pit (nuclear weapon)">bomb core</a> made of <a href="/wiki/Plutonium%E2%80%93gallium_alloy" title="Plutonium–gallium alloy">plutonium–gallium alloy</a>. This core, subsequently nicknamed the "<a href="/wiki/Demon_core" title="Demon core">demon core</a>", was later involved in the death of another physicist, <a href="/wiki/Louis_Slotin" title="Louis Slotin">Louis Slotin</a>. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Early_life_and_education">Early life and education</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Harry_Daghlian&action=edit&section=1" title="Edit section: Early life and education"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Haroutune Krikor Daghlian Jr., was born in <a href="/wiki/Waterbury,_Connecticut" title="Waterbury, Connecticut">Waterbury, Connecticut</a>, on May 4, 1921, one of three children of Margaret Rose (<i><a href="/wiki/Birth_name" title="Birth name">née</a></i> Currie) and Haroutune Krikor Daghlian. His father was an ethnic <a href="/wiki/Armenians" title="Armenians">Armenian</a> from <a href="/wiki/Gaziantep" title="Gaziantep">Gaziantep</a> in what is now <a href="/wiki/Turkey" title="Turkey">Turkey</a>. He had a sister, Helen, and a brother, Edward.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> Soon after his birth the family moved across state to the coastal town of <a href="/wiki/New_London,_Connecticut" title="New London, Connecticut">New London, Connecticut</a>. He was educated at Harbor Elementary School, where he played violin in the school orchestra, and at <a href="/wiki/Bulkeley_School" title="Bulkeley School">Bulkeley High School</a>. In 1938, at the age of 17, he entered the <a href="/wiki/Massachusetts_Institute_of_Technology" title="Massachusetts Institute of Technology">Massachusetts Institute of Technology</a>, intending to study mathematics,<sup id="cite_ref-nl-man-1st-victim_3-0" class="reference"><a href="#cite_note-nl-man-1st-victim-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> but became interested in physics, particularly <a href="/wiki/Particle_physics" title="Particle physics">particle physics</a>, which was then emerging as an exciting new field. This interest led him to transfer to the <a href="/wiki/West_Lafayette,_Indiana" title="West Lafayette, Indiana">West Lafayette, Indiana</a>, campus of <a href="/wiki/Purdue_University" title="Purdue University">Purdue University</a>, from which he graduated with a <a href="/wiki/Bachelor_of_Science" title="Bachelor of Science">Bachelor of Science</a> degree in 1942. He then commenced work on his doctorate, assisting <a href="/wiki/Marshall_Holloway" title="Marshall Holloway">Marshall Holloway</a> with the <a href="/wiki/Cyclotron" title="Cyclotron">cyclotrons</a>. In 1944, while still a graduate student, he joined <a href="/wiki/Otto_Frisch" class="mw-redirect" title="Otto Frisch">Otto Frisch</a>'s Critical Assembly Group at the <a href="/wiki/Los_Alamos_Laboratory" class="mw-redirect" title="Los Alamos Laboratory">Los Alamos Laboratory</a> of the <a href="/wiki/Manhattan_Project" title="Manhattan Project">Manhattan Project</a>.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Criticality_accident_and_death">Criticality accident and death</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Harry_Daghlian&action=edit&section=2" title="Edit section: Criticality accident and death"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>During an experiment on August 21, 1945, Daghlian was attempting to build a <a href="/wiki/Neutron_reflector" title="Neutron reflector">neutron reflector</a> manually by stacking a set of 4.4-kilogram (9.7 lb) <a href="/wiki/Tungsten_carbide" title="Tungsten carbide">tungsten carbide</a> bricks in an incremental fashion around a plutonium core. The purpose of the neutron reflector was to reduce the mass required for the plutonium core to attain criticality. He was moving the final brick over the assembly, but neutron counters alerted Daghlian to the fact that the addition of that brick would render the system <a href="/wiki/Critical_mass" title="Critical mass">supercritical</a>. As he withdrew his hand, he inadvertently dropped the brick onto the center of the assembly. Since the assembly was nearly in the critical state, the accidental addition of that brick caused the reaction to go immediately into the <a href="/wiki/Prompt_critical" class="mw-redirect" title="Prompt critical">prompt critical</a> region of neutronic behavior. This resulted in a <a href="/wiki/Criticality_accident" title="Criticality accident">criticality accident</a>.<sup id="cite_ref-review_6-0" class="reference"><a href="#cite_note-review-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Sullivan_2016_p._14-16_7-0" class="reference"><a href="#cite_note-Sullivan_2016_p._14-16-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> </p><p>Daghlian reacted immediately after dropping the brick and attempted to knock the brick off the assembly without success. He was forced to disassemble part of the tungsten-carbide pile in order to halt the reaction.<sup id="cite_ref-Millerp68_8-0" class="reference"><a href="#cite_note-Millerp68-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> </p><p>Daghlian was estimated to have received a dose of 510 <a href="/wiki/R%C3%B6ntgen_equivalent_man" class="mw-redirect" title="Röntgen equivalent man">rem</a> (5.1 <a href="/wiki/Sievert" title="Sievert">Sv</a>) of <a href="/wiki/Neutron_radiation" title="Neutron radiation">neutron radiation</a>, from a yield of 10<sup>16</sup> <a href="/wiki/Nuclear_fission" title="Nuclear fission">fissions</a>.<sup id="cite_ref-review_6-1" class="reference"><a href="#cite_note-review-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> Despite intensive medical care, he developed symptoms of severe <a href="/wiki/Radiation_poisoning" class="mw-redirect" title="Radiation poisoning">radiation poisoning</a>, and his sister and widowed mother were flown out to care for him.<sup id="cite_ref-nl-man-1st-victim_3-1" class="reference"><a href="#cite_note-nl-man-1st-victim-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> He fell into a coma and died 25 days after the accident.<sup id="cite_ref-Millerp68_8-1" class="reference"><a href="#cite_note-Millerp68-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Sullivan_2016_p._14-16_7-1" class="reference"><a href="#cite_note-Sullivan_2016_p._14-16-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> He was the first known fatality caused by a criticality accident. His body was returned to New London, where he was buried at <a href="/wiki/Cedar_Grove_Cemetery_(New_London,_Connecticut)" title="Cedar Grove Cemetery (New London, Connecticut)">Cedar Grove Cemetery</a>.<sup id="cite_ref-A_quiet_victim_of_a_horrific_war_he_helped_end_9-0" class="reference"><a href="#cite_note-A_quiet_victim_of_a_horrific_war_he_helped_end-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> </p> <ul class="gallery mw-gallery-traditional"> <li class="gallerybox" style="width: 235px"> <div class="thumb" style="width: 230px; height: 195px;"><span typeof="mw:File"><a href="/wiki/File:Louis_Slotin_%26_Harry_K._Daghlian_Jr.jpg" class="mw-file-description" title="The two physicists Louis Slotin (with sunglasses) and Harry Daghlian Jr. (seated middle) during the Trinity Test preparation in July 1945. Both physicists died following supercriticality accidents."><img alt="The two physicists Louis Slotin (with sunglasses) and Harry Daghlian Jr. (seated middle) during the Trinity Test preparation in July 1945. Both physicists died following supercriticality accidents." src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a0/Louis_Slotin_%26_Harry_K._Daghlian_Jr.jpg/200px-Louis_Slotin_%26_Harry_K._Daghlian_Jr.jpg" decoding="async" width="200" height="150" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a0/Louis_Slotin_%26_Harry_K._Daghlian_Jr.jpg/300px-Louis_Slotin_%26_Harry_K._Daghlian_Jr.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a0/Louis_Slotin_%26_Harry_K._Daghlian_Jr.jpg/400px-Louis_Slotin_%26_Harry_K._Daghlian_Jr.jpg 2x" data-file-width="857" data-file-height="643" /></a></span></div> <div class="gallerytext">The two physicists <a href="/wiki/Louis_Slotin" title="Louis Slotin">Louis Slotin</a> (with sunglasses) and Harry Daghlian Jr. (seated middle) during the Trinity Test preparation in July 1945. Both physicists died following supercriticality accidents.</div> </li> <li class="gallerybox" style="width: 235px"> <div class="thumb" style="width: 230px; height: 195px;"><span typeof="mw:File"><a href="/wiki/File:Partially-reflected-plutonium-sphere.jpeg" class="mw-file-description" title="The sphere of plutonium surrounded by neutron-reflecting tungsten carbide blocks in a re-enactment of Daghlian's 1945 experiment[6]"><img alt="The sphere of plutonium surrounded by neutron-reflecting tungsten carbide blocks in a re-enactment of Daghlian's 1945 experiment[6]" src="//upload.wikimedia.org/wikipedia/commons/thumb/1/13/Partially-reflected-plutonium-sphere.jpeg/200px-Partially-reflected-plutonium-sphere.jpeg" decoding="async" width="200" height="160" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/13/Partially-reflected-plutonium-sphere.jpeg/300px-Partially-reflected-plutonium-sphere.jpeg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/13/Partially-reflected-plutonium-sphere.jpeg/400px-Partially-reflected-plutonium-sphere.jpeg 2x" data-file-width="800" data-file-height="640" /></a></span></div> <div class="gallerytext">The sphere of <a href="/wiki/Plutonium" title="Plutonium">plutonium</a> surrounded by neutron-reflecting <a href="/wiki/Tungsten_carbide" title="Tungsten carbide">tungsten carbide</a> blocks in a re-enactment of Daghlian's 1945 experiment<sup id="cite_ref-review_6-2" class="reference"><a href="#cite_note-review-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup></div> </li> <li class="gallerybox" style="width: 235px"> <div class="thumb" style="width: 230px; height: 195px;"><span typeof="mw:File"><a href="/wiki/File:Daghlian-hand.jpg" class="mw-file-description" title="Harry K. Daghlian's blistered and burnt hand, photographed on August 30, 1945, after he received his fatal radiation dose. He died 16 days after this photo was taken."><img alt="Harry K. Daghlian's blistered and burnt hand, photographed on August 30, 1945, after he received his fatal radiation dose. He died 16 days after this photo was taken." src="//upload.wikimedia.org/wikipedia/commons/thumb/0/0e/Daghlian-hand.jpg/200px-Daghlian-hand.jpg" decoding="async" width="200" height="148" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/0e/Daghlian-hand.jpg/300px-Daghlian-hand.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/0e/Daghlian-hand.jpg/400px-Daghlian-hand.jpg 2x" data-file-width="800" data-file-height="590" /></a></span></div> <div class="gallerytext">Harry K. Daghlian's blistered and burnt hand, photographed on August 30, 1945, after he received his fatal radiation dose. He died 16 days after this photo was taken.</div> </li> </ul> <div class="mw-heading mw-heading2"><h2 id="Legacy">Legacy</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Harry_Daghlian&action=edit&section=3" title="Edit section: Legacy"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>As a result of the incident, safety regulations for the project were scrutinized and revised. A special committee<sup class="noprint Inline-Template" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citing_sources" title="Wikipedia:Citing sources"><span title="Statement needs to be more specific about the content to which it refers. (March 2022)">specify</span></a></i>]</sup> was established to review any similar experiments and recommend appropriate safety procedures. This change of procedures included needing a minimum of two people involved in such an experiment, using at least two instruments monitoring neutron intensities with audible alerts, and preparing a plan for operating methods and any contingencies that might occur during similar experiments.<sup id="cite_ref-accidents-1956_10-0" class="reference"><a href="#cite_note-accidents-1956-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> Additionally, discussions and designs for remote-controlled test devices were initiated, eventually leading to the creation of the <a href="/wiki/Godiva_device" title="Godiva device">Godiva device</a>.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (August 2021)">citation needed</span></a></i>]</sup> </p><p>These changes did not prevent another criticality accident from happening at Los Alamos the following year. <a href="/wiki/Louis_Slotin" title="Louis Slotin">Louis Slotin</a>, a colleague of Daghlian's, was killed in 1946 while performing criticality tests on the same plutonium core.<sup id="cite_ref-review_6-3" class="reference"><a href="#cite_note-review-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> After these two incidents it became known as the "<a href="/wiki/Demon_core" title="Demon core">demon core</a>",<sup id="cite_ref-third_11-0" class="reference"><a href="#cite_note-third-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> and all similar criticality experiments were halted until remote-controlled assembly devices were more fully developed and available.<sup id="cite_ref-accidents-1956_10-1" class="reference"><a href="#cite_note-accidents-1956-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> </p><p>In 2000, the city of New London erected a memorial stone and flagpole in Calkins Park to honor Daghlian. His surname is misspelled "Daghiian" on the monument. The monument bears an inscription: "though not in uniform, he died in service to his country."<sup id="cite_ref-A_quiet_victim_of_a_horrific_war_he_helped_end_9-1" class="reference"><a href="#cite_note-A_quiet_victim_of_a_horrific_war_he_helped_end-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Harry_Daghlian&action=edit&section=4" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite class="citation news cs1"><a rel="nofollow" class="external text" href="https://www.newspapers.com/article/the-day/130926121/">"Article clipped from The Day"</a>. <i>The Day</i>. September 19, 1945. p. 11<span class="reference-accessdate">. Retrieved <span class="nowrap">July 1,</span> 2024</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=The+Day&rft.atitle=Article+clipped+from+The+Day&rft.pages=11&rft.date=1945-09-19&rft_id=https%3A%2F%2Fwww.newspapers.com%2Farticle%2Fthe-day%2F130926121%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHarry+Daghlian" class="Z3988"></span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFHoward" class="citation web cs1">Howard, Lee. <a rel="nofollow" class="external text" href="https://www.theday.com/local-news/20230826/a-death-in-the-desert-that-oppenheimer-ignored/">"A death in the desert that 'Oppenheimer' ignored"</a>. <i>www.theday.com</i><span class="reference-accessdate">. Retrieved <span class="nowrap">July 1,</span> 2024</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=www.theday.com&rft.atitle=A+death+in+the+desert+that+%27Oppenheimer%27+ignored&rft.aulast=Howard&rft.aufirst=Lee&rft_id=https%3A%2F%2Fwww.theday.com%2Flocal-news%2F20230826%2Fa-death-in-the-desert-that-oppenheimer-ignored%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHarry+Daghlian" class="Z3988"></span></span> </li> <li id="cite_note-nl-man-1st-victim-3"><span class="mw-cite-backlink">^ <a href="#cite_ref-nl-man-1st-victim_3-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-nl-man-1st-victim_3-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFBaumann1985" class="citation news cs1">Baumann, Paul (August 6, 1985). <a rel="nofollow" class="external text" href="https://news.google.com/newspapers?nid=1915&dat=19850806&id=DiBSAAAAIBAJ&pg=2472,1066749">"NL man was 1st victim of atomic experiments"</a>. <i><a href="/wiki/The_Day_(New_London)" title="The Day (New London)">The Day</a></i>. pp. 1, 4<span class="reference-accessdate">. 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Atomic Heritage Foundation. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20150830000707/http://www.atomicheritage.org/profile/harry-daghlian">Archived</a> from the original on August 30, 2015<span class="reference-accessdate">. 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(1991). <span class="id-lock-registration" title="Free registration required"><a rel="nofollow" class="external text" href="https://archive.org/details/underclouddec00mill/page/68"><i>Under the Cloud: The Decades of Nuclear Testing</i></a></span>. <a href="/wiki/The_Woodlands,_Texas" title="The Woodlands, Texas">The Woodlands, Texas</a>: Two Sixty Press. pp. <a rel="nofollow" class="external text" href="https://archive.org/details/underclouddec00mill/page/68">68, 69, 77</a>. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/0-02-921620-6" title="Special:BookSources/0-02-921620-6"><bdi>0-02-921620-6</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Under+the+Cloud%3A+The+Decades+of+Nuclear+Testing&rft.place=The+Woodlands%2C+Texas&rft.pages=68%2C+69%2C+77&rft.pub=Two+Sixty+Press&rft.date=1991&rft.isbn=0-02-921620-6&rft.aulast=Miller&rft.aufirst=Richard+L.&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2Funderclouddec00mill%2Fpage%2F68&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHarry+Daghlian" class="Z3988"></span></span> </li> <li id="cite_note-A_quiet_victim_of_a_horrific_war_he_helped_end-9"><span class="mw-cite-backlink">^ <a href="#cite_ref-A_quiet_victim_of_a_horrific_war_he_helped_end_9-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-A_quiet_victim_of_a_horrific_war_he_helped_end_9-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFSlosberg2000" class="citation news cs1">Slosberg, Steven (June 8, 2000). <a rel="nofollow" class="external text" href="https://news.google.com/newspapers?nid=1915&dat=20000608&id=t5pGAAAAIBAJ&pg=1792,1497197">"A quiet victim of a horrific war he helped end"</a>. <i><a href="/wiki/The_Day_(New_London)" title="The Day (New London)">The Day</a></i>. p. C1<span class="reference-accessdate">. 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Restricted data blog. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20140407081649/http://blog.nuclearsecrecy.com/2013/08/16/the-third-cores-revenge/">Archived</a> from the original on April 7, 2014<span class="reference-accessdate">. Retrieved <span class="nowrap">April 4,</span> 2014</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=The+Third+Core%27s+Revenge&rft.pub=Restricted+data+blog&rft.aulast=Wellerstein&rft.aufirst=Alex&rft_id=http%3A%2F%2Fblog.nuclearsecrecy.com%2F2013%2F08%2F16%2Fthe-third-cores-revenge%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHarry+Daghlian" class="Z3988"></span><sup class="noprint Inline-Template" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Reliable_sources" title="Wikipedia:Reliable sources"><span title="The material near this tag may rely on an unreliable source. (August 2021)">unreliable source?</span></a></i>]</sup><sup class="noprint Inline-Template" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Verifiability#Self-published_sources" title="Wikipedia:Verifiability"><span title="This reference citation appears to be to a self-published source. 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style="font-size:114%;margin:0 4em"><a href="/wiki/Manhattan_Project" title="Manhattan Project">Manhattan Project</a></div></th></tr><tr><td class="navbox-abovebelow" colspan="2"><div><a href="/wiki/Timeline_of_the_Manhattan_Project" title="Timeline of the Manhattan Project">Timeline</a></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Sites</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Ames_Project" title="Ames Project">Ames</a></li> <li><a href="/wiki/Calutron" title="Calutron">Berkeley</a></li> <li><a href="/wiki/Metallurgical_Laboratory" title="Metallurgical Laboratory">Chicago</a> (<a href="/wiki/Site_A" title="Site A">Site A</a>)</li> <li><a href="/wiki/Dayton_Project" title="Dayton Project">Dayton</a></li> <li><a href="/wiki/Hanford_Engineer_Works" title="Hanford Engineer Works">Hanford</a></li> <li><a href="/wiki/Project_Camel" title="Project Camel">Inyokern</a></li> <li><a href="/wiki/Project_Y" title="Project Y">Los Alamos</a></li> <li><a href="/wiki/Montreal_Laboratory" title="Montreal Laboratory">Montreal</a></li> <li><a href="/wiki/K-25" title="K-25">New York</a></li> <li><a href="/wiki/Clinton_Engineer_Works" title="Clinton Engineer Works">Oak Ridge</a></li> <li><a href="/wiki/Salt_Wells_Pilot_Plant" title="Salt Wells Pilot Plant">Salt Wells Pilot Plant</a></li> <li><a href="/wiki/Trinity_(nuclear_test)" title="Trinity (nuclear test)">Trinity</a></li> <li><a href="/wiki/Wendover_Air_Force_Base" title="Wendover Air Force Base">Wendover</a></li> <li><a href="/wiki/P-9_Project" title="P-9 Project">Heavy water sites</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Administrators</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Vannevar_Bush" title="Vannevar Bush">Vannevar Bush</a></li> <li><a href="/wiki/Arthur_Compton" title="Arthur Compton">Arthur Compton</a></li> <li><a href="/wiki/James_B._Conant" title="James B. Conant">James B. Conant</a></li> <li><a href="/wiki/Priscilla_Duffield" title="Priscilla Duffield">Priscilla Duffield</a></li> <li><a href="/wiki/Thomas_Farrell_(United_States_Army_officer)" title="Thomas Farrell (United States Army officer)">Thomas Farrell</a></li> <li><a href="/wiki/Leslie_Groves" title="Leslie Groves">Leslie Groves</a></li> <li><a href="/wiki/John_Lansdale_Jr." title="John Lansdale Jr.">John Lansdale</a></li> <li><a href="/wiki/Ernest_Lawrence" title="Ernest Lawrence">Ernest Lawrence</a></li> <li><a href="/wiki/James_C._Marshall" title="James C. Marshall">James Marshall</a></li> <li><a href="/wiki/Franklin_Matthias" title="Franklin Matthias">Franklin Matthias</a></li> <li><a href="/wiki/Dorothy_McKibbin" title="Dorothy McKibbin">Dorothy McKibbin</a></li> <li><a href="/wiki/Kenneth_Nichols" title="Kenneth Nichols">Kenneth Nichols</a></li> <li><a href="/wiki/J._Robert_Oppenheimer" title="J. Robert Oppenheimer">Robert Oppenheimer</a></li> <li><a href="/wiki/William_Sterling_Parsons" title="William Sterling Parsons">Deak Parsons</a></li> <li><a href="/wiki/Boris_Pash" title="Boris Pash">Boris Pash</a></li> <li><a href="/wiki/William_R._Purnell" title="William R. Purnell">William Purnell</a></li> <li><a href="/wiki/Frank_Spedding" title="Frank Spedding">Frank Spedding</a></li> <li><a href="/wiki/Charles_Allen_Thomas" title="Charles Allen Thomas">Charles Thomas</a></li> <li><a href="/wiki/Paul_Tibbets" title="Paul Tibbets">Paul Tibbets</a></li> <li><a href="/wiki/William_L._Uanna" title="William L. Uanna">Bud Uanna</a></li> <li><a href="/wiki/Harold_Urey" title="Harold Urey">Harold Urey</a></li> <li><a href="/wiki/Stafford_L._Warren" title="Stafford L. Warren">Stafford Warren</a></li> <li><a href="/wiki/Ed_Westcott" title="Ed Westcott">Ed Westcott</a></li> <li><a href="/wiki/Roscoe_Charles_Wilson" title="Roscoe Charles Wilson">Roscoe Wilson</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Scientists</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Luis_Walter_Alvarez" title="Luis Walter Alvarez">Luis Alvarez</a></li> <li><a href="/wiki/Robert_Bacher" title="Robert Bacher">Robert Bacher</a></li> <li><a href="/wiki/Hans_Bethe" title="Hans Bethe">Hans Bethe</a></li> <li><a href="/wiki/Aage_Bohr" title="Aage Bohr">Aage Bohr</a></li> <li><a href="/wiki/Niels_Bohr" title="Niels Bohr">Niels Bohr</a></li> <li><a href="/wiki/Norris_Bradbury" title="Norris Bradbury">Norris Bradbury</a></li> <li><a href="/wiki/James_Chadwick" title="James Chadwick">James Chadwick</a></li> <li><a href="/wiki/John_Cockcroft" title="John Cockcroft">John Cockcroft</a></li> <li><a href="/wiki/Charles_Critchfield" title="Charles Critchfield">Charles Critchfield</a></li> <li><a class="mw-selflink selflink">Harry Daghlian</a></li> <li><a href="/wiki/John_R._Dunning" title="John R. Dunning">John R. Dunning</a></li> <li><a href="/wiki/Enrico_Fermi" title="Enrico Fermi">Enrico Fermi</a></li> <li><a href="/wiki/Richard_Feynman" title="Richard Feynman">Richard Feynman</a></li> <li><a href="/wiki/Val_Logsdon_Fitch" title="Val Logsdon Fitch">Val Fitch</a></li> <li><a href="/wiki/James_Franck" title="James Franck">James Franck</a></li> <li><a href="/wiki/Klaus_Fuchs" title="Klaus Fuchs">Klaus Fuchs</a></li> <li><a href="/wiki/Maria_Goeppert_Mayer" title="Maria Goeppert Mayer">Maria Goeppert Mayer</a></li> <li><a href="/wiki/George_Kistiakowsky" title="George Kistiakowsky">George Kistiakowsky</a></li> <li><a href="/wiki/George_Koval" title="George Koval">George Koval</a></li> <li><a href="/wiki/Willard_Libby" title="Willard Libby">Willard Libby</a></li> <li><a href="/wiki/Edwin_McMillan" title="Edwin McMillan">Edwin McMillan</a></li> <li><a href="/wiki/Mark_Oliphant" title="Mark Oliphant">Mark Oliphant</a></li> <li><a href="/wiki/George_B._Pegram" title="George B. Pegram">George B. Pegram</a></li> <li><a href="/wiki/Norman_Ramsey_Jr." title="Norman Ramsey Jr.">Norman Ramsey Jr.</a></li> <li><a href="/wiki/Isidor_Isaac_Rabi" title="Isidor Isaac Rabi">Isidor Isaac Rabi</a></li> <li><a href="/wiki/James_Rainwater" title="James Rainwater">James Rainwater</a></li> <li><a href="/wiki/Bruno_Rossi" title="Bruno Rossi">Bruno Rossi</a></li> <li><a href="/wiki/Glenn_T._Seaborg" title="Glenn T. Seaborg">Glenn Seaborg</a></li> <li><a href="/wiki/Emilio_Segr%C3%A8" title="Emilio Segrè">Emilio Segrè</a></li> <li><a href="/wiki/Louis_Slotin" title="Louis Slotin">Louis Slotin</a></li> <li><a href="/wiki/Henry_DeWolf_Smyth" title="Henry DeWolf Smyth">Henry DeWolf Smyth</a></li> <li><a href="/wiki/Leo_Szilard" title="Leo Szilard">Leo Szilard</a></li> <li><a href="/wiki/Edward_Teller" title="Edward Teller">Edward Teller</a></li> <li><a href="/wiki/Stanis%C5%82aw_Ulam" title="Stanisław Ulam">Stanisław Ulam</a></li> <li><a href="/wiki/John_von_Neumann" title="John von Neumann">John von Neumann</a></li> <li><a href="/wiki/John_Archibald_Wheeler" title="John Archibald Wheeler">John Wheeler</a></li> <li><a href="/wiki/Eugene_Wigner" title="Eugene Wigner">Eugene Wigner</a></li> <li><a href="/wiki/Robert_R._Wilson" title="Robert R. Wilson">Robert Wilson</a></li> <li><a href="/wiki/Leona_Woods" title="Leona Woods">Leona Woods</a></li> <li><a href="/wiki/Chien-Shiung_Wu" title="Chien-Shiung Wu">Chien-Shiung Wu</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Operations</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Alsos_Mission" title="Alsos Mission">Alsos Mission</a></li> <li><a href="/wiki/Atomic_bombings_of_Hiroshima_and_Nagasaki" title="Atomic bombings of Hiroshima and Nagasaki">Bombings of Hiroshima and Nagasaki</a></li> <li><a href="/wiki/Operation_Crossroads" title="Operation Crossroads">Operation Crossroads</a></li> <li><a href="/wiki/Operation_Peppermint" title="Operation Peppermint">Operation Peppermint</a></li> <li><a href="/wiki/Project_Alberta" title="Project Alberta">Project Alberta</a></li> <li><a href="/wiki/Silverplate" title="Silverplate">Silverplate</a></li> <li><a href="/wiki/509th_Composite_Group" title="509th Composite Group">509th Composite Group</a></li> <li><i><a href="/wiki/Enola_Gay" title="Enola Gay">Enola Gay</a></i></li> <li><i><a href="/wiki/Bockscar" title="Bockscar">Bockscar</a></i></li> <li><i><a href="/wiki/The_Great_Artiste" title="The Great Artiste">The Great Artiste</a></i></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Weapons</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Fat_Man" title="Fat Man">Fat Man</a></li> <li><a href="/wiki/Little_Boy" title="Little Boy">Little Boy</a></li> <li><a href="/wiki/Pumpkin_bomb" title="Pumpkin bomb">Pumpkin bomb</a></li> <li><a href="/wiki/Thin_Man_(nuclear_bomb)" title="Thin Man (nuclear bomb)">Thin Man</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related topics</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/African-American_scientists_and_technicians_on_the_Manhattan_Project" title="African-American scientists and technicians on the Manhattan Project">African Americans</a></li> <li><a href="/wiki/Atomic_Energy_Act_of_1946" title="Atomic Energy Act of 1946">Atomic Energy Act of 1946</a></li> <li><a href="/wiki/Bismuth_phosphate_process" title="Bismuth phosphate process">Bismuth phosphate process</a></li> <li><a href="/wiki/British_contribution_to_the_Manhattan_Project" title="British contribution to the Manhattan Project">British contribution</a></li> <li><a href="/wiki/Calutron_Girls" title="Calutron Girls">Calutron Girls</a></li> <li><a href="/wiki/Chicago_Pile-1" title="Chicago Pile-1">Chicago Pile-1</a></li> <li><a href="/wiki/Demon_core" title="Demon core">Demon core</a></li> <li><a href="/wiki/Einstein%E2%80%93Szilard_letter" title="Einstein–Szilard letter">Einstein–Szilard letter</a></li> <li><a href="/wiki/Franck_Report" title="Franck Report">Franck Report</a></li> <li><a href="/wiki/Interim_Committee" title="Interim Committee">Interim Committee</a></li> <li><a href="/wiki/K-25" title="K-25">K-25 Project</a></li> <li><i><a href="/wiki/Los_Alamos_Primer" title="Los Alamos Primer">Los Alamos Primer</a></i></li> <li><a href="/wiki/List_of_Nobel_laureates_who_worked_on_the_Manhattan_Project" title="List of Nobel laureates who worked on the Manhattan Project">Nobel Prize laureates</a></li> <li><a href="/wiki/Oppenheimer_security_hearing" class="mw-redirect" title="Oppenheimer security hearing">Oppenheimer security hearing</a></li> <li><a href="/wiki/Plutonium" title="Plutonium">Plutonium</a></li> <li><a href="/wiki/Quebec_Agreement" title="Quebec Agreement">Quebec Agreement</a></li> <li><a href="/wiki/RaLa_Experiment" title="RaLa Experiment">RaLa Experiment</a></li> <li><a href="/wiki/S-1_Executive_Committee" 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