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6 Radioactivity

6 Radioactivity

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Question 62

In a high-temperature gas-cooled nuclear reactor (HTGR) using helium coolant and graphite blocks as a moderator:

  • the average speed of the fast fission neutrons upon release is 1.8 × 107 m s-1
  • the average speed of the moderated thermal neutrons is 3.1 × 103 m s-1

Calculate the average speed of the moderated thermal neutrons as a percentage of the average speed of the fast fission neutrons.

Give your answer to 2 significant figures.

[2]
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6 Radioactivity Questions

  1. GCSE
  2. /Physics
  3. /6 Radioactivity

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