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Radioactivity Review

                                                 
                                               
                                 
                                         
                       
                               
                                         
                                 
                                   
                                 
                                             
                                   
                               
                                         
                                     
                                             
Across
  1. 3. A particle that is the antimatter opposite of an electron.
  2. 7. This occurs when an unstable nucleus breaks down into two smaller nuclei and releases energy.
  3. 8. This common material can shield alpha particles.
  4. 9. This element is a common alpha particle emitter.
  5. 10. One of two or more forms of the same element.
  6. 11. This type of naturally-occurring radioactive gas is the most common cause of lung cancer in non-smokers.
  7. 12. The time period during which a radioactive isotope decays to half its value is called this.
  8. 15. This type of radiation can pass through the body sometimes causing health effects.
  9. 18. a beta particle
  10. 19. This type of radiation particle is capable of penetrating only the very outer layer of living skin cells.
Down
  1. 1. This is a highly radioactive man-made gas. It is an isotope of hydrogen and sometimes found in heavy water.
  2. 2. The breakdown of an unstable, radioactive element from a parent element into a daughter element.
  3. 4. The charge on a beta particle.
  4. 5. This is a heavy element which can fission. It emits the type of radiation found in 3 across.
  5. 6. This chronic health effect can occur due to radiation exposure.
  6. 13. using the known half-life and proportions of a sample to determine the age of something.
  7. 14. The breakdown of an unstable, radioactive element from a parent element into a daughter element.
  8. 16. this doesn't change with beta particle emission.
  9. 17. Common shield for gamma waves.