Key Radioactivity Terminology Crossword

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Across
  1. 2. Radiation which can pass through most materials and is weakly ionising, can be blocked by thick lead or concrete (5)
  2. 7. Naturally occurring radiation which surrounds us all the time (10)
  3. 10. The first type of radioactive decay observed, stopped by a piece of paper, highly ionising (5)
  4. 11. very small, negatively charged particle which is not involved in nuclear physics (8)
  5. 12. Two elements are ____________ of each other if they have the same number of protons and different numbers of neutrons (8)
  6. 14. the activity of a radioactive sample is the number of decays per ____________ (6)
Down
  1. 1. This fluid is good at absorbing neutron radiation as it contains lots of hydrogen (5)
  2. 2. The ___________-Muller tube is used to detect radiation
  3. 3. The time taken for half the atoms in the sample to decay (4,4)
  4. 4. Changes to DNA which can be brought about by radioactive particles causing chemical reactions inside our cells. Can lead to cancer (9)
  5. 5. The thing at the centre of an atom (7)
  6. 6. Radiation which can be stopped by a few mm of Aluminium, moderately ionising (4)
  7. 8. Uncharged particle in the centre of an atom (7)
  8. 9. This nucleus has two protons and two neutrons and is emitted in one type of radiation (6)
  9. 13. Every atom of the same element has the same number of ___________ in it’s nucleus (6)