Lithium hydride
Before the Castle Bravo nuclear weapons test in 1954, it was thought that only the less common isotope lithium-6 would breed tritium when struck with fast neutrons. The Castle Bravo test showed (accidentally) that the more plentiful lithium-7 also does so under extreme conditions, albeit by an endothermic reaction.
Daigo Fukuryū Maru
The crew suffered acute radiation syndrome (ARS) for a number of weeks after the Bravo test in March. During their ARS treatment, the crew were inadvertently infected with hepatitis C through blood transfusions. All recovered except for Aikichi Kuboyama, the boat's chief radioman, who died on September 23, 1954, from an underlying liver cirrhosis compounded by the secondary hepatitis C infection. Kuboyama is considered the first victim of the hydrogen bomb and of test shot Castle Bravo.