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The Castle Bravo device was housed in a cylinder that weighed 23,500 pounds (10,700 kg) and measured 179.5 inches (456 cm) in length and 53.9 inches (137 cm) in diameter. [3] The primary device was a COBRA deuterium-tritium gas-boosted atomic bomb made by Los Alamos Scientific Laboratory, a very compact MK 7 device.
Operation Castle was an unqualified success for the implementation of dry fuel devices. The Bravo design was quickly weaponized and is suspected to be the progenitor of the Mk-21 gravity bomb. The Mk-21 design project began on March 26, 1954 (just three weeks after Bravo), with production of 275 weapons beginning in late 1955.
The second series of tests in 1954 was codenamed Operation Castle. The first detonation was Castle Bravo, which tested a new design utilizing a dry-fuel thermonuclear bomb. It was detonated at dawn on March 1, 1954. Scientists miscalculated: the 15 Mt of TNT nuclear explosion far exceeded the expected yield of 4–8 Mt of TNT (6 predicted). [6]
While most of the Operation Castle tests were intended to evaluate weapons intended for immediate stockpile, or which were already available for use as part of the Emergency Capability Program, Castle Bravo was intended to test a design which would drastically reduce the size and costs of the first generation of air-droppable atomic weapons ...
Setsuko Thurlow's activism began after March 1, 1954, after the explosion of the hydrogen bomb of the code name "Castle Bravo" in the Bikini Atoll in the Marshall Islands which had nuclear fallout until Japan. [20] [21] This American weapon was approximately one thousand times more powerful than the one she had been victim of less than 10 years ...
It was a fortification built to withstand an atomic blast and ensure phones kept ringing even during and after an attack. ... one-bathroom Cold War-era bomb shelter is listed for sale at $499,000 ...
The bomb fell on the bomb-bay doors, smashing them open and going into a 15,000 feet (4,572 m) free fall. The high-explosive detonator went off after it hit the ground 6.5 miles east of Florence , South Carolina, in Mars Bluff , creating a 70 feet (21 m) wide crater, 30 feet (9 m) deep. [ 41 ]
Comparative fireball radii for a selection of nuclear weapons. [citation needed] Contrary to the image, which may depict the initial fireball radius, the maximum average fireball radius of Castle Bravo, a 15-megatonne yield surface burst, is 3.3 to 3.7 km (2.1 to 2.3 mi), [6] [7] and not the 1.42 km displayed in the image.