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【英国《航空研究》1987年3月20日报道】海军首次提出需要极低污染的核武器,武器的钚-241含量在3%或2%以下,以减少紧靠人员的武器贮存区的残余辐射。
[Aerospace Research] reported on March 20, 1987 that the navy first proposed nuclear weapons that require extremely low pollution. The weapons have a thorium-241 content of 3% or less to reduce the residual radiation in the arms storage area immediately adjacent to personnel. .