A PuBe source has a neutron activity of 1.6 x 105 Bq. The neutrons are produced by the 9Be(∝ , 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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