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bomb pulse n.— «Because of atmospheric testing of nuclear bombs between 1945 and 1960, the atmosphere received a sharp spike of carbon-14, commonly called the “bomb pulse,” that has been declining to normal levels as excess...
bomb
n.— «Bomb: a diary entry causing alarm but not ticking.» —“Revealed: how to chat up a senior clerk” by Nina Goswami TheLawyer.com July 13, 2007. (source: Double-Tongued Dictionary)