The Mark 22 nuclear bomb (Mk-22) was the first thermonuclear device test by the University of California Radiation Lab (UCRL).
The Mk-22 failed to achieve anything like its intended yield due to premature heating of the secondary from exposure to neutrons.
Within a month of the bomb's failure, the Mk-22 was terminated because the United States Atomic Energy Commission realized there was nothing that could be done to salvage the design.
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