Nuclear Reactors, Fission and Fusion

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Across
  1. 3. Beta radiation consists of this elementary particle.
  2. 6. Amount of nuclear decays per second. Measured in Becquerels (Bq)
  3. 8. Lots of this is released when nuclei undergo fission or fusion.
  4. 10. Common material, along with graphite, which can be used as a moderator.
  5. 12. Slows down neutrons to increase the chance of fission
  6. 13. Made of lead and concrete to block all types of radiation emitted from a Nuclear Reactor from getting to the outside.
  7. 15. The total mass of the products after fission or fusion _________. This difference is released as energy according to E = mc^2.
  8. 16. An atom where electrons have been removed, leaving them positively charged overall.
Down
  1. 1. Element from which control rods are made.
  2. 2. Radiation with a very short range, but high ionising strength. Consists of 2 protons + 2 neutrons.
  3. 4. A slow moving ______ needs to be absorbed by a uranium nucleus to start the fission process.
  4. 5. After 2 half-lives, the activity of a radioactive substance will be a _________ of what it started as.
  5. 7. These absorb neutrons to prevent an uncontrolled chain reaction and keep the rate of energy generation constant.
  6. 9. The process whereby two light nuclei join together to form a single heavy nucleus.
  7. 11. The process whereby a heavy nucleus splits into two lighter daughter nuclei.
  8. 14. Radiation which does not cause a nucleus to change into a different element when released. Not made of any particles.