An 85 kg worker at a breeder reactor plant accidentally ingests 2.5 mg of 239Pu, dust. This isotope has a half-life of 24 100 y, decaying by alpha decay. The energy of the emitted alpha particles is 5.2 MeV with an RBE factor of 13. Assume that the plutonium resides in the worker's body for 12 h and that 95% of the emitted alpha particles are stopped within the body. Calculate

(a) The number of plutonium atoms ingested,

(b) The number that decay during the 12 h,

(c) The energy absorbed by the body,

(d) The resulting physical dose in grays, and

(e) The dose equivalent in severs