What is an advantage of a nuclear-fission reactor?
A.
The nuclear waste generated has a very long half-life.
B.
A large amount of energy can be produced from a small amount of uranium.
C.
The power plants are only expensive if they require radiation shielding.
D.
The products of fission reactions are often radioactive isotopes.
Answers
Answer:
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Explanation:
A )Strontium-90 and cesium-137 have half-lives of about 30 years (half the radioactivity will decay in 30 years). Plutonium-239 has a half-life of 24,000 years. High-level wastes are hazardous because they produce fatal radiation doses during short periods of direct exposure
B) if enough of these expelled neutrons cause the nuclei of other U-235 atoms to split, releasing further neutrons, a fission 'chain reaction' can be achieved. When this happens over and over again, many millions of times, a very large amount of heat is produced from a relatively small amount of uranium
c)
For many nuclear plants, they have detailed construction records, broken out by which building different materials and labor went to, and how much each of them cost. There's also a detailed record of safety regulations and when they were instituted relative to construction
D) For fission of uranium-235, the predominant radioactive fission products include isotopes of iodine, caesium, strontium, xenon and barium. The threat becomes smaller with the passage of time
d ) is the correct answer
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