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Castle Bravo vs. W-59 Minuteman I - Comparison of sizes
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Castle Bravo
W-59 Minuteman I

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Castle Bravo
W-59 Minuteman I
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Castle Bravo

Castle Bravo
Castle Bravo
Blast Radius Blast Radius11.3km
Fireball Radius Fireball Radius 3.710km
Kilotons Kilotons15000kt
Radiation Radius Radiation Radius3.630km

Castle Bravo was the first in a series of high-yield thermonuclear weapon design tests conducted by the United States at Bikini Atoll, Marshall Islands, as part of Operation Castle. Detonated on March 1, 1954, the device was the most powerful nuclear device detonated by the United States and its first lithium deuteride fueled thermonuclear weapon. Castle Bravo's yield was 15 megatons of TNT, 2.5 times the predicted 6.0 megatons, due to unforeseen additional reactions involving lithium-7, which led to the unexpected radioactive contamination of areas to the east of Bikini Atoll. At the time, it was the most powerful artificial explosion in history. Fallout, the heaviest of which was in the form of pulverized surface coral from the detonation, fell on residents of Rongelap and Utirik atolls, while the more particulate and gaseous fallout spread around the world.



The inhabitants of the islands were not evacuated until three days later and suffered radiation sickness. Twenty-three crew members of the Japanese fishing vessel Daigo Fukuryū Maru ("Lucky Dragon No. 5") were also contaminated by the heavy fallout, experiencing acute radiation syndrome. The blast incited international reaction over atmospheric thermonuclear testing.The Bravo Crater is located at 11°41′50″N 165°16′19″E. The remains of the Castle Bravo causeway are at 11°42′6″N 165°17′7″E.

Source: Wikipedia
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W-59 Minuteman I

W-59 Minuteman I
W-59 Minuteman I
Blast Radius Blast Radius7.03km
Fireball Radius Fireball Radius 0.970km
Height Height16.3m
Kilotons Kilotons1000kt
Radiation Radius Radiation Radiuskm
Weight Weight250kg

The W59 was an American thermonuclear warhead used on some Minuteman I ICBM missiles from 1962 to 1969, and planned to be used on the cancelled GAM-87 Skybolt air-launched ballistic missile. Modified to use a less-sensitive high explosive in the primary, the design formed the basis for the British WE.177, used by both the Royal Air Force and Royal Navy. The W59 was 16.3 inches in diameter and 47.8 inches long, and it weighed 550 pounds (250 kg). It had a design yield of 1 megaton, with a yield-to-weight ratio of 4 kiloton per kilogram. A total of 150 W59 warheads were produced during its lifetime. The W59 was one of five nuclear weapon designs identified by researcher Chuck Hansen as using the common design Tsetse primary or first fission bomb stage.



Hansen's research indicates that the Tsetse primary was used in the US B43 nuclear bomb, W44 nuclear warhead, W50 nuclear warhead, B57 nuclear bomb, and W59. Historical evidence indicates that these weapons shared a reliability problem, which Hansen attributes to miscalculation of the reaction cross section of tritium in fusion reactions. The weapons were not tested as extensively as some prior models due to a mid-1960s nuclear test moratorium, and the reliability problem was discovered and fixed after the moratorium ended. This problem was apparently shared by the Python primary designs.

Source: Wikipedia

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