blog.nuclearsecrecy.com

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• property: og:site_name content: Restricted Data: A Nuclear History Blog
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• name: description content: Restricted Data is a blog about nuclear secrecy, past and present, run by Alex Wellerstein, an historian of science.
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• name: twitter:title content: Restricted Data: The Nuclear Secrecy Blog
• name: twitter:description content: Restricted Data is a blog about nuclear secrecy, past and present, run by Alex Wellerstein, an historian of science.
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• A Nuclear History Blog
• About me
• NUKEMAP roadmap
• https://i0.wp.com/blog.nuclearsecrecy.com/wp-content/uploads/2026/02/NUKEMAP-Chrome-Mac-2026-scaled.jpg?ssl=1
• 1
• 2
• http://blog.nuclearsecrecy.com/#identifier_1_7538
• http://blog.nuclearsecrecy.com/#identifier_2_7538
• NUKEMAP
• News and Notes
• footnotes
• New book: The Most Awful Responsibility
• https://i0.wp.com/blog.nuclearsecrecy.com/wp-content/uploads/2025/12/TheMostAwfulResponsibility.jpg?ssl=1
• mermaids
• 1940s
• 1950s
• Books
• Harry S. Truman
• Hiroshima
• Historiography
• Manhattan Project
• Manhattan Project fissile material inventories
• https://i0.wp.com/blog.nuclearsecrecy.com/wp-content/uploads/2025/10/HEU-carrying-cases-Little-Boy.jpg?ssl=1
• Coster-Mullen
• this post
• https://i0.wp.com/blog.nuclearsecrecy.com/wp-content/uploads/2025/10/Cumulative-Shipments-of-U-235-from-Electromagnetic-Plant-to-Los-Alamos-1944-1946.jpg?ssl=1
• https://i0.wp.com/blog.nuclearsecrecy.com/wp-content/uploads/2025/10/MDH-B4V6P4-TS-Redacted.jpg?ssl=1
• https://i0.wp.com/blog.nuclearsecrecy.com/wp-content/uploads/2025/10/MDH-B4V6P4-TS-scaled.jpg?ssl=1
• https://i0.wp.com/blog.nuclearsecrecy.com/wp-content/uploads/2025/10/MDH-B4V6-P4-Plotted.jpg?ssl=1
• 1
• 2
• https://i0.wp.com/blog.nuclearsecrecy.com/wp-content/uploads/2025/10/LAHDRA-graph-plutonium-inventory-Los-Alamos-1945.jpg?ssl=1
• https://i0.wp.com/blog.nuclearsecrecy.com/wp-content/uploads/2025/10/LAHDRA-vs-Curve-B.jpg?ssl=1
• https://i0.wp.com/blog.nuclearsecrecy.com/wp-content/uploads/2025/10/MED-fissile-material-production.jpg?ssl=1
• https://i0.wp.com/blog.nuclearsecrecy.com/wp-content/uploads/2025/10/MED-fissile-material-production-rates.jpg?ssl=1
• https://i0.wp.com/blog.nuclearsecrecy.com/wp-content/uploads/2025/10/Weapon-equivalents-of-fissile-materials-1944-1947.jpg?ssl=1
• http://blog.nuclearsecrecy.com/#identifier_1_7492
• http://blog.nuclearsecrecy.com/#identifier_2_7492
• Archives
• Declassification
• Fat Man
• Hanford
• Leslie Groves
• Little Boy
• Los Alamos
• Oak Ridge
• plutonium
• Redactions
• footnotes
• News and updates
• https://i0.wp.com/blog.nuclearsecrecy.com/wp-content/uploads/2024/07/doomsday-machines-banner.jpg?ssl=1
• https://i0.wp.com/blog.nuclearsecrecy.com/wp-content/uploads/2025/09/TheMostAwfulResponsibility-1.jpg?ssl=1
• https://i0.wp.com/blog.nuclearsecrecy.com/wp-content/uploads/2025/09/Lyndon-Eiffel-2025-1.jpg?ssl=1
• Did Sandia use a thermonuclear secondary in a product logo?
• https://i0.wp.com/blog.nuclearsecrecy.com/wp-content/uploads/2024/09/2007-Sandia-Sierra-Mechanics-Package-Logo-Slide-1716635.jpg?ssl=1
• 1
• https://i0.wp.com/blog.nuclearsecrecy.com/wp-content/uploads/2024/09/2007-Sierra-Salinas-warhead-1716635-detail.jpg?ssl=1
• 2
• https://i0.wp.com/blog.nuclearsecrecy.com/wp-content/uploads/2024/09/2008-Sierra-Salinas-warhead-1709042-detail.jpg?ssl=1
• https://i0.wp.com/blog.nuclearsecrecy.com/wp-content/uploads/2024/09/2007-Sierra-Salinas-warhead-1716635-page-23.jpg?ssl=1
• 3
• like the ones I wrote about previously
• https://i0.wp.com/blog.nuclearsecrecy.com/wp-content/uploads/2024/09/SAND2007-6128P-Model.jpg?ssl=1
• 4
• 5
• https://i0.wp.com/blog.nuclearsecrecy.com/wp-content/uploads/2024/09/NMHB-fig_13-9rev.png?ssl=1
• https://i0.wp.com/blog.nuclearsecrecy.com/wp-content/uploads/2024/09/2001-Stober-and-Hoffman-Inconvenient-Spy-W88.jpg?ssl=1
• 6
• https://i0.wp.com/blog.nuclearsecrecy.com/wp-content/uploads/2024/09/1999-Cox-Report-Los-Alamos.jpg?ssl=1
• https://i0.wp.com/blog.nuclearsecrecy.com/wp-content/uploads/2024/09/Sandia-UNCLEARED-badge-scaled.jpg?ssl=1
• https://i0.wp.com/blog.nuclearsecrecy.com/wp-content/uploads/2024/09/1997-DOE-Multipurpose-Test-Object.jpg?ssl=1
• 7
• 8
• can put “brackets” around the possibilities of truth
• 9
• https://i0.wp.com/blog.nuclearsecrecy.com/wp-content/uploads/2024/09/2019-Sierra-Mechanics-logo-1640699.jpg?ssl=1
• 10
• https://i0.wp.com/blog.nuclearsecrecy.com/wp-content/uploads/2024/09/LargeRvMesh.png?ssl=1
• https://i0.wp.com/blog.nuclearsecrecy.com/wp-content/uploads/2024/09/Aldermaston-test-object.jpg?ssl=1
• 11
• http://blog.nuclearsecrecy.com/#identifier_1_7400
• http://blog.nuclearsecrecy.com/#identifier_2_7400
• http://blog.nuclearsecrecy.com/#identifier_3_7400
• http://blog.nuclearsecrecy.com/#identifier_4_7400
• http://blog.nuclearsecrecy.com/#identifier_5_7400
• Joint DOE/DoD Topical Classification Guide for Nuclear Assembly Systems
• http://blog.nuclearsecrecy.com/#identifier_6_7400
• this
• http://blog.nuclearsecrecy.com/#identifier_7_7400
• http://blog.nuclearsecrecy.com/#identifier_8_7400
• http://blog.nuclearsecrecy.com/#identifier_9_7400
• http://blog.nuclearsecrecy.com/#identifier_10_7400
• http://blog.nuclearsecrecy.com/#identifier_11_7400
• 2000s
• 2010s
• Bad ideas
• Bomb design
• Graphic design
• Hydrogen bomb
• Sandia National Laboratories
• footnotes
• 11 Comments »
• « Older Entries
• Post archives
• About the blog
• Articles and appearances
• Visualizations
• Document list
• Resources for Teachers, Students, and Researchers
• Announcing DOOMSDAY MACHINES
• Henry Stimson didn’t go to Kyoto on his honeymoon
• Deconstructing “The Doomsday Machine” – Part 1: The Question of Memory
• Oppenheimer: Vacated but not Vindicated
• Did the Japanese offer to surrender before Hiroshima? (Part 2)
• ►
• Visions
• Meditations
• Articles
• 1960s
• 1970s
• 1980s
• 1990s
• 2020s
• Accidents
• Atomic Energy Commission
• Business and industry
• Civil Defense
• Counterfactuals
• David E. Lilienthal
• Department of Energy
• Edward Teller
• Espionage
• FBI
• Firebombing
• Franklin D. Roosevelt
• Germany
• H-bomb
• J. Robert Oppenheimer
• Japan
• John Coster-Mullen
• Joint Committee on Atomic Energy
• Klaus Fuchs
• Leaks
• Leo Szilard
• Livermore
• Manhattan (show)
• Musings
• Nagasaki
• North Korea
• Nuclear fallout
• Nuclear power
• Nuclear testing
• Proliferation
• Resources
• Smyth Report
• Soviet Union
• Speculation
• Tinian
• Trinity
• Vannevar Bush
• William L. Laurence

• NUKEMAP
• Protomaps
• Ploughshares
• Future of Life Institute
• Tweet
• https://alexwellerstein.com/writing/books/the-most-awful-responsibility/
• strange URL
• D8719897
• SF Materials Shipped or Received from 12/31/1946 thru 05/01/1947
• this cover letter
• https://stacks.cdc.gov/view/cdc/131522
• Doomsday Machines
• Nuclear Knowledges group
• this presentation given to NASA
• Unclassified Illustration of a Staged Weapon
• Nuclear Matters Handbook 2020
• https://amzn.to/3Mv7EjA
• Howard Morland
• Cox Committee’s report
• my book
• http://doomsdaymachines.net/
• Utah Teapot
• Sandia National Laboratories and Engineering Sciences Overview
• Modeling and Simulation at Sandia: An Overview
• 1523 General Capability Overview
• https://www.youtube.com/watch?v=DQEB3LJ5psk
• a Los Alamos presentation on computer modeling
• Large-Scale Inverse Capabilities in Sierra Mechanics
• Joint venture
• The Non-Intrusive Model Testing of Delicate and Critical Structures
• an in-house AWRE publication (
• Stevens Institute of Technology
• @wellerstein
• https://alexwellerstein.com/writing/books/restricted-data/
• https://amzn.to/4pRq5k8
• https://doomsdaymachines.net
• Oregon Road '83
• Restricted Data: The History of Nuclear Secrecy in the United States (2021)
• Recent posts from DOOMSDAY MACHINES
• The spoils of nuclear war
• A strange, unloved apocalypse
• Bomber arithmetic
• "To build a shelter was to admit to the kind of age we lived in..."
• Paper cups and a Confederate Flag
• "It isn’t a happy picture, is it?"
• It came from the deep
• Burning up the world
• "Strange even to the men who used them"
• A long look at a QUICK STRIKE

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