本题目来源于试卷: Nuclear Energy; Effects and Uses of Radiation，类别为 IB物理学
[问答题]
A reactor that uses highly ela(q8qn q dz1nq24hmq (+e,stnriched uranium can use ordihmv j9bck 71l)e:mgup2-/ a jinary water (instead of heavy water) as a moderator and still have a self-jv mm2e/c-pg9l bju1 h:k)a i7sustaining chain reaction. Explain.
参考答案:
If the uranium is highly enriched, it won’t matter that the ordinary water is a poorer moderator of neutrons than the heavy water. There will still be enough fissionable nuclei that even with the lower number of slowed (moderated) neutrons in ordinary water, the chain reaction will proceed. If the uranium is not highly enriched, there are not as many fissionable nuclei. If ordinary water is used, too many neutrons would be lost to absorption in the ordinary water and the relative amount of moderated neutrons would decrease. In that case heavy water is better than ordinary water for sustaining the chain reaction.
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