Suppose that an 90.0-gram laboratory animal ingested 12.0 mg of a substance that contained 2.60% by mass Pu-239, an alpha emitter with a half-life of 24,110 years. If all of the energy from the emitted alpha particles is absorbed by the animal's tissues, and if the energy of each emission is 7.77 x 10–12 J, what is the dose in rads to the animal in the first 4.5 hours following the ingestion of the radioactive material?
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