Structure of the Atom and Radioactivity GCSE

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