Across
- 3. a low level of radiation in the environment to which we are always exposed
- 4. a detector of the amount of radiation from a source
- 5. it is a form of electromagnetic radiation
- 6. a French Physicist who discovered radioactivity in 1896
- 7. a type of radiation that is made up of two protons and two neutrons
- 8. this happens when our bodies receive a dose of radiation
- 11. a unit used to express the number of atoms that decay each second
- 13. radiation that comes from space
Down
- 1. radiation which causes materials to be charged when absorbed
- 2. the emission of radiation by a nucleus in an attempt to become more stable
- 6. the average time taken for half of the atoms in a sample to decay
- 9. a radioactive gas found in the air which seeps up to the Earth's surface from the uranium rocks underground
- 10. this is also a beta particle
- 12. an artificial radiation which comes from medical sources used to see what is inside our body