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Can we calculate the number of photons emitted per second by a radioactive source (gamma) ? we can take 100g of barium-133 as an example

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yes it only depends on the amount of radioactive material present and the decay constant (decays per second) –  Martin Beckett Jan 25 '13 at 18:36
    
...to within statistics, of course. –  dmckee Jan 25 '13 at 18:43
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