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Unformatted text preview: = or , gamma A radioactive samples activity is N , which is decays per second 1 becquerel = 1 Bq 1 decay per second; 1 curie = 1 Ci = 3 . 7 10 10 Bq dN dt =- N = - N N t = N ( t ) = N e- t where N N ( t = ) half-life t 1 / 2 related to by = ln 2 / t 1 / 2 The Wang calculator, circa 1968...
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