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24CFEE28-37F6-47A7-A3EA-7418F25E1D7A.jpegPhysics (Nuclear)

24CFEE28-37F6-47A7-A3EA-7418F25E1D7A.jpeg

29) In March of 2011, several reactors at the Fukushima Nuclear Power Plant in Japan exploded, releasing
a variety of radioactive isotopes. One isotope was iodine-131 ( I ), which is especially dangerous for
humans because I can replace the nonradioactive stable iodine isotope, I
127 1 , and accumulate in
thyroid glands where the decays can damage cells.
a) A reaction energy of Q = 0.972 MeV/decay is released by
127 1 . What is this in J/decay?
b) The first measurements after the explosions revealed that the power due to the decay of 131
$3I was at
98.0 kW. In Bq (i.e., decay/s), what was the activity of , I at this time? Explain. (Hint: Use unit
analysis to find an equation to relate the given quantities.)

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Answers: (a)Reaction energy is given by,Q = 1.56 x 10 -13... View the full answer

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