Nuclear Radiation

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Across
  1. 2. To break down and emit nuclear radiation
  2. 4. Nuclear radiation made from 2 protons and 2 neutrons
  3. 6. The building blocks of matter
  4. 8. The centre of an atom
  5. 10. An unstable element that with undergo nuclear decay
  6. 11. A high frequency electromagnetic wave
  7. 12. To have electrons removed from the atom
Down
  1. 1. A high speed electron ejected from the nucleus
  2. 3. 3mm of this can stop beta
  3. 5. Can block alpha particles
  4. 7. A different form of an element with more or fewer neutrons
  5. 8. An uncharged sub atomic particle
  6. 9. Several cms of this are needed to reduce gamma