The specific activity of cobalt57, whose half life is 270 days, will be
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Cobalt-57 decays with a half-life of 270 days by electron capture and cobalt-60 decays with a half-life of 5.3 years by emitting a beta particle with two energetic gamma rays; the combined energy of these two gamma rays is 2.5 MeV (one has an energy of 1.2 MeV and the other has an energy of 1.3 MeV).
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