Similar to the '' Shrimp '' TX-21 device tested before in the Castle Bravo test , it differed from that device in using lithium deuteride derived from natural lithium ( a mixture of 7.5 % lithium-6 and 92.5 % lithium-7 isotopes ) as the source of the tritium and deuterium fusion fuels , as opposed to the relative high enrichment level of lithium ( approximately 40 % lithium-6 ) deuteride used in Bravo
Castle Bravo
Castle Bravo
Castle Romeo