Why is 137Cs considered as one of the most problematic fission products in a reactor accident? Please give two reasons.

The Canadian CANDU reactor uses natural uranium, with the moderator consisting of heavy water (deuterium oxide). If the moderator were removed, what would happen to the uranium in the reactor? Nothing. The reactor would continue to run normally. The fission reactions would stop. The reactor would blow up like an atomic bomb.

A 56-kg sphere of U-235 constitutes a critical mass. If the sphere were flattened into a pancake shape, would it still be critical? Explain.

A 75 kg patient swallows a 33 μCi beta emitter whose half-life is 5.0 days and whose RBE is 1.6. The beta particles are emitted with an average energy of 0.35 MeV, 90% of which is absorbed by the body. You are a health care worker needing to find the patient's dose equivalent after one week. These series of steps will help you find that dose equivalent. In all questions, assume the radioactive nuclei are distributed throughout the patient's body and are not being excreted. Part A How many radioactive nuclei did the patient swallow? Express your answer using three significant figures. ▸ View Available Hint(s) No= ΜΕ ΑΣΦ Submit ?