Radioactivity Form 3

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Across
  1. 4. is positively charged particle.
  2. 9. radiation is radioactive radiation that passes through the air and produced charged particle.
  3. 12. Marie Curie died because of prolonged ______ to gamma rays.
  4. 13. has the lowest penetration power
  5. 17. Radioactive _______ is emitted when an unstable nucleus decay.
  6. 19. hands are used to handle radioactive substances safely.
  7. 20. example of ionising radiation
  8. 21. is the S.I unit for radioactivity.
  9. 22. quantity of biological effect from ionising radiation measured on human body
Down
  1. 1. is time taken for the number of undecayed nuclei to be reduced to half of its original value.
  2. 2. is used to determine the age of fossils and artifacts
  3. 3. particle is negatively charged.
  4. 5. is not deflected by electric field and magnetic field.
  5. 6. is used to determine the absorption rate of phosphate fertilisers in plants
  6. 7. is a random and spontaneous decay process of an unstable nucleus
  7. 8. Decay of ______ emitted Alpha particle.
  8. 10. Discovered X-ray
  9. 11. neutral particle
  10. 14. radiation is made up of various types of ionising radiation in the environment.
  11. 15. is example for natural sources of ionising radiation.
  12. 16. sheet can stop beta radiation.
  13. 18. emitted gamma rays to kill cancer cells.