was the code name
given to the first U.S.
test of a dry fuel thermonuclear hydrogen bomb
device, detonated on March 1, 1954 at Bikini Atoll
, Marshall Islands
, as the first test of Operation Castle
. Castle Bravo was the most powerful nuclear device
ever detonated by the United States, with a yield of 15 megatons
. That yield, far exceeding the expected yield of 4 to 6 megatons, combined with other factors, led to the most significant accidental radiological contamination
ever caused by the United States. Fallout
from the detonation — intended to be a secret test — poisoned the islanders who had previously inhabited the atoll and returned there afterwards, as well as the crew of Daigo Fukuryū Maru
("Lucky Dragon No. 5"), a Japanese fishing boat, and created international concern about atmospheric thermonuclear testing.John Bellamy Foster (2009). The Ecological Revolution: Making Peace with the Planet
, Monthly Review Press, New York, p. 73.
The device was a very large cylinder weighing 23,500 pounds
) and measuring 179.5 inches
(4.56 m) in length and 53.9 inches (1.37 m) in width. It was mounted in a "shot cab" on an artificial island built on a reef off Namu Island, in... Read More