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Problemset13_Solutions

# Problemset13_Solutions - [4 In 1989 two electrochemists...

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P114 PROBLEM SET 13 Spring 2007 Homework to be handed in by 1700 hours on 1 May 2007 [1] Assume 200 MeV of energy is released per f ssion of uranium in a nuclear reactor (a) Calculate the number of f ssions per second to provide 1 GW. (b) Calculate the mass burnt per day to produce a steady 1 GW. [2] The counting rate from a radioactive source is 8000 counts/s at time t=0, while 10 mins later the rate is 1000 counts/s. (a) What is the half-life? (b) What is the decay constant? (c) What is the counting rate after 30 minutes? [3] Assume that your body contains 50 kg of carbon. For living tissue the ratio of 14 C to total carbon is 1 . 3 × 10 12 . Estimate the number of 14 C decays per minute in your body.

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Unformatted text preview: [4] In 1989, two electrochemists, Pons and Fleischmann claimed to have discovered cold fusion of deuterium in an electrochemical cell. The fusion reactions lead to two possible f nal states that occur with equal probability: 2 H + 2 H = 3 He + n + 3 . 27 MeV 2 H + 2 H = 3 H + 1 H + 4 . 03 MeV (a) How many neutrons will be emitted in the generation of 4 W? (b) If 15% of these neutrons are absorbed by a 60 kg Fleischmann, and if each neutron carries an average energy of 0.5 MeV with an RBE of 4, what radiation dose rate in rems/hour will Fleischmann receive? (c) How long would it take for Fleischmann to receive a lethal 500 rem dose? 1...
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Problemset13_Solutions - [4 In 1989 two electrochemists...

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