Structure of the Atom and Radioactivity GCSE

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Across
  1. 3. Sub-atomic particle which has negative charge (8)
  2. 6. The second of the two inventors of a Radioactivity counting device (6)
  3. 7. One of the inventors of a radioactivity counting device (6)
  4. 11. The transfer of radioactive materials onto a subject (13)
  5. 13. City in Ukraine which suffered a Nuclear catastrophe (9)
  6. 19. Type of fruit which has a slightly higher radioactivity than normal (6)
  7. 20. Charge of the electron (8)
  8. 23. One of two types of charge (8)
  9. 26. Unit of the exposure dosage of radioactivity (7)
  10. 28. A particle or group of atoms which is not neutrally charged (3)
  11. 29. The time for the number of unstable nuclei to reduce to 50% of its starting value (4,4)
  12. 30. Atoms of the same element, with different number of neutrons (7)
  13. 32. Verb: to cause an atom to become charged by gain or loss of an electron (6)
  14. 33. The property of having no net charge (7)
  15. 34. Sub atomic particle which does not affect the element type (7)
  16. 35. Dangerous bi-product of nuclear power which must not be disposed of but stored safely (7,5)
  17. 36. Component of a nuclear power station which is used to moderate the amount of energy released by the fuel rods (7,3)
  18. 37. Name given to the unit of radiation counts per second (9)
Down
  1. 1. Branch of science which makes use of radioactivity in the pursuit of human health (8)
  2. 2. Japanese site of a nuclear disaster (9)
  3. 4. The central structure in an atom comprising the protons and neutrons (7)
  4. 5. Element which has an isotope useful in determining the age of fossils ancient bio-derived matter (6)
  5. 8. Type of radiation which has no mass (5)
  6. 9. Property of radiation which describes its ability to pass through a medium (11)
  7. 10. Radioactive element commonly used in medicine for internal imaging (7)
  8. 12. The exposure to radiation without touching the radioactive material (11)
  9. 14. Material of high density often used to shield from radioactivity (4)
  10. 15. Material of low thickness and density which can absorb alpha radiation (5)
  11. 16. Name given to the radiation which present in the surroundings (10)
  12. 17. Type of radiation used in detecting the thickness of paper (4)
  13. 18. Household device which makes use of radioactivity (5,8)
  14. 21. Description of a nucleus which is likely to decay (7)
  15. 22. The scientist responsible for the plum pudding model (7)
  16. 24. Element commonly used in Nuclear power fuel rods (7)
  17. 25. Electrons exist in the atom in these (6)
  18. 26. describes a neutron's speed required for induced fission (4)
  19. 27. The most ionising type of radiation (5)
  20. 31. The number which decides what element an atom is (7)