A PuBe source has a neutron activity of 1.6 × 105 Bq. The neutrons are produced by the 9Be(α, n)12C reaction with an effective cross section of 90 mb and thickness of 3.2 cm. (a) What is the probability of an incident alpha particle interacting with a 9Be nucleus? (b) What must be the rate of alpha particles incident on 9Be? (c) What must be the amount of mass of the 239Pu producing the alpha particles?
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