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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 at 18:36
...to within statistics, of course. – dmckee♦ Jan 25 at 18:43

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