Mark 36 nuclear bomb

The Mark 36 was a heavy, high-yield thermonuclear bomb developed by the United States during the 1950s, using a multi-stage fusion secondary to generate yields up to about 10 megatons of TNT equivalent. Production began in April 1956 as an improved successor to the Mark 21, and 920 units were manufactured or converted from earlier models. It remained in the American arsenal from the mid-1950s until all Mark 36 bombs were retired between August 1961 and January 1962. The bomb measured 56.2 to 59 inches in diameter and 150 inches long, weighing approximately 17,500 to 17,700 pounds depending on variant. Two main versions existed: a conventional Y1 variant and a low-fission, cleaner Y2 variant, differing in yield based on their tamper-pusher construction. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/