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Demon core
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The demon core was a sphere of plutonium that was involved in two fatal radiation accidents when scientists tested it as a fissile core of an early atomic bomb. It was manufactured by the Manhattan Project, the U.S. nuclear weapon development effort during World War II. It was a subcritical mass that weighed 6.2 kilograms (14 lb) and was 8.9 centimeters (3.5 in) in diameter.
A re-creation of the experiment involved in the 1945 incident. The sphere of plutonium is surrounded by tungsten carbide blocks acting as neutron refl
A re-creation of the experiment involved in the 1945 incident. The sphere of plutonium is surrounded by tungsten carbide blocks acting as neutron reflectors.
The two physicists Harry Daghlian (center left) and Louis Slotin (center right) during the Trinity Test. Both died following supercriticality accident
The two physicists Harry Daghlian (center left) and Louis Slotin (center right) during the Trinity Test. Both died following supercriticality accidents involving the "demon core."
A drawing based on the above sketch
A drawing based on the above sketch
Image: Tickling the Dragons Tail
Image: Tickling the Dragons Tail
Operation Crossroads
Videos
Operation Crossroads was a pair of nuclear weapon tests conducted by the United States at Bikini Atoll in mid-1946. They were the first nuclear weapon tests since Trinity on July 16, 1945, and the first detonations of nuclear devices since the atomic bombing of Nagasaki on August 9, 1945. The purpose of the tests was to investigate the effect of nuclear weapons on warships.
Prospective Operation Crossroads target ships and support ships at Pearl Harbor on February 27, 1946. Ships from front to rear: USS Crittenden, Catron
Prospective Operation Crossroads target ships and support ships at Pearl Harbor on February 27, 1946. Ships from front to rear: USS Crittenden, Catron, Bracken, Burleson, Gilliam, Fallon, unknown ship, Fillmore, Kochab, Luna, and an unidentified tanker and Liberty ship. On the right are LSM-203 and LSM-465. Farther in the background are a floating drydock and a merchant ship hulk.
Nevada painted in high visibility orange for the atomic tests
Nevada painted in high visibility orange for the atomic tests
The target fleet after test Able. The aircraft carrier Saratoga is right-center with Independence burning at left-center. The ex-Japanese battleship N
The target fleet after test Able. The aircraft carrier Saratoga is right-center with Independence burning at left-center. The ex-Japanese battleship Nagato is between them. The ship at left, next to the battleship Pennsylvania, is trying to wash down the radioactivity with water from the lagoon.
Aerial view of the Able mushroom cloud rising from the lagoon with the Bikini Island visible in the background. The cloud carried the radioactive cont
Aerial view of the Able mushroom cloud rising from the lagoon with the Bikini Island visible in the background. The cloud carried the radioactive contaminants into the stratosphere.