1. Demo: Background radiation
Geiger–Muller tube and counter

2. Notes…The word ‘Radioactive’ is…
…used to describe a material, atom or element
that emits radiation (alpha, beta or gamma).
Radiation is emitted from unstable nuclei of
atoms and is a random process.
These radiation can be in the form of
electromagnetic waves, or energetic particles.
Radioactive elements are naturally found in the
environment, contributing to background
radiation e.g. rocks and food.

3. Task
Calculate your annual dose of background
radiation.

4. Check learning
Where does radiation come from?

5. 4
2
6
1
6
3
2
9
5
6 Copy the table into the
back of your book
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Starter Designed by Eugene Brunet; Adapted for PowerPoint by A. Camburn, St George School
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