P1, P2, P3 & P4

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Across
  1. 3. resistance is measured in these
  2. 5. start of the electomagnetic spectrum
  3. 9. the time is takes radiation to decrease in activity by half
  4. 10. substances that give out radiation and know to be this
  5. 11. was placed in a russian spys drink to kill him (type of radiation)
  6. 13. nuclear radiation does this to materials
  7. 14. used in hospitals
  8. 15. the colour of the earth wire
  9. 16. in wave form this made the hulk become the hulk
Down
  1. 1. plastic is a poor one of these
  2. 2. fuel tankers are this when they are fueling something
  3. 4. generated by friction
  4. 6. voltmeter measures these
  5. 7. gamma radiation is used for this in hospitals
  6. 8. the colour of the netural wire
  7. 12. this is called an object that is within the earths gravitational field
  8. 15. middle strenght radiation