What primary engineering challenge is encountered when designing radiation shields for reactors_________________?
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Answer: D. fast neutrons and gamma rays
Explanation
Fast neutrons and gamma rays possess high penetrating power and lack electrical charge. These specific radiation types easily pass through standard barriers, requiring specialized dense shielding materials. Consequently, mitigating fast neutrons and gamma rays forms the primary challenge in shield engineering. Gamma rays require very dense materials like lead or depleted uranium to attenuate their intensity. Fast neutrons require hydrogen-rich materials like water or concrete to slow them down effectively. Radiation attenuation calculations ensure that worker exposure remains well below regulatory safety limits.
Nuclear reactor containment buildings must protect personnel and the surrounding environment from intense radiation. Shielding design impacts the overall weight and economic feasibility of mobile nuclear propulsion systems. Properly engineered shields prevent structural material degradation caused by continuous neutron bombardment. Option A is wrong because alpha particles are easily stopped by a sheet of paper. Option B is incorrect because beta particles require only thin plastic or metal sheets for shielding. Option C is wrong because thermal neutrons are easily captured by materials like boron or cadmium.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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