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