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Thorium-232 has a half-life of 14.05 billion years. The decay product of thorium-228 is alpha particles with a kinetic energy of 4.08 MeV. a. What

Thorium-232 has a half-life of 14.05 billion years. The decay product of thorium-228 is alpha particles with a kinetic energy of 4.08 MeV.

a. What is the decay constant for thorium-228?

b. If a single Thorium-228 nucleus exists today, what is the probability that it will still exist

4.0 billion years from today?

c. What is the activity of the 0.43 moles of Thorium-232?

d. If a 72 kg person absorbs 1.5% of the radioactive alpha particles emitted in 2.1 seconds,

what is the equivalent dose absorbed? Is it dangerous?

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