heat transfer crossword

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Across
  1. 5. - Radiation that travels as a wave (5)
  2. 7. Beta particles are high energy ______ (9)
  3. 11. - Equipment used to detect radiation (6,7)
  4. 13. - When a material now contains radioactive particles inside it, it has become (12)
  5. 14. - What you call a nucleus that emits radiation (8)
  6. 19. - A fast-moving particle (8)
  7. 20. - Beta particles have a _____ charge (8)
  8. 22. - Lead is used as this for radiation (6)
  9. 23. - The nucleus emits radiation to become more... (6)
  10. 24. - Symbol for a radioactive warning (7)
Down
  1. 1. - Most ionising radiation (5)
  2. 2. - The damage that radiation can do to living cells (8)
  3. 3. - Radiation from natural sources (10)
  4. 4. - is dangerous because it is said to be (8)
  5. 6. - Half-life is a measurement of the quantity of _____ (4)
  6. 8. - The name for the process of releasing nuclear radiation (5)
  7. 9. - Alpha particles have this type of charge (8)
  8. 10. - Unit used to measure radioactivity (9)
  9. 12. - Beta positive radiation is a (8)
  10. 15. - Alpha particles are made of two protons and two... (8)
  11. 16. - Radiation can be detected using a Geiger-Müller... (4)
  12. 17. - The type of radiation that is a high-energy electron (4)
  13. 18. - A use of gamma radiation in medicine (13)
  14. 21. - Time taken for half of a radioactive substance to decay (8)