| 词条 | Mark 90 nuclear bomb |
| 释义 |
The Mark 90 nuclear bomb, given the nickname "Betty", was a cold war nuclear depth charge, developed by the United States in 1952. It had a length of {{height|ft=10|in=2}}, a diameter of {{height|ft=2|in=7.5}}, and a weight of {{convert|1243|lb|abbr=on}}, and it carried a Mark 7 nuclear warhead with a yield of 32 kilotons. Its purpose was to serve as an anti-submarine weapon for the United States Navy. A test of the Mark 90 was conducted in 1955, as Operation Wigwam. All units were withdrawn from service by 1960. AccidentOn September 25, 1959, a United States Navy Martin P5M-2 Marlin (BuNo 135540, SG tailcode, '6', of VP-50) was patrolling out of NAS Whidbey Island when it was forced to ditch in the Pacific Ocean, about 100 miles west of the Washington-Oregon border. A Mark 90 depth charge casing was lost and never recovered, but it was not fitted with an active warhead.{{citation needed|date=January 2013}} The ten crew members were rescued by the US Coast Guard, after ten hours in a raft. The press was not notified at the time.[1] References1. ^Gibson, James N. Nuclear Weapons of the United States - An Illustrated History . Atglen, Pennsylvania.: Schiffer Publishing Ltd., 1996, Library of Congress card no. 96-67282, {{ISBN|0-7643-0063-6}}, Chapter 12, "Nuclear Anti-Submarine Weapons", page 214. External links
3 : Cold War anti-submarine weapons of the United States|Depth charges|Nuclear bombs of the United States |
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