1. Radioactive decay

2. Engager GCSE Question

3. Self Marking

4. To understand the structure and properties of alpha, beta and gamma radiation
Progress
To evaluate the uses of different types of radioactive isotopes.
To predict the properties of alpha, beta and gamma radiation.
To justify how radioactive isotopes cause Ionisation.

5. To demonstrate good progress in this lesson
Name
Will…
To evaluate the uses of different types of radioactive isotopes.
To predict the properties of alpha, beta and gamma radiation.
To justify how radioactive isotopes cause Ionisation.
The Honley Learning Mindset Advocate for this lesson is…
Matthew – will show resilience by not giving up if he finds something difficult.

6. What is Radioactivity?
Some atomic Isotopes are unstable and emit radiation so they become more stable this process is called Radioactive Decay.
There are three types of radiation –
Alpha α
Beta β
Gamma γ

7. Types of Radioactivity
Press the buttons to show the three types of radioactivity...

8. Connector - Ionising Radiation
When radiation hits an atom it can cause it to lose electrons.
The positively charged atom produced is called an ion, and this process is called ionisation.
Radioactivity is measured in Becquerel (Bq)
Radioactive decay is measured by using a detector called a Geiger-Muller tube (eg a Geiger Counter)

9. Ionisation
Run the animation to see how the different forms of radiation can ionise an atom of lithium.

10. Everybody come to the front ‘but not too close’.

11. Copy down the diagram showing the penetration power of the three types of radiation.  
Skin or paper
stops ALPHA
Thin aluminium
stops BETA
Thick lead
reduces GAMMA
Thin Plastic

12. The effects of a field on radiation
Beta radiation has a –1 charge and a small mass so is strongly deflected
Gamma radiation has no mass or charge so it is not deflected.
Alpha radiation has a +2 charge but a RAM of 4 so is only weakly deflected.
The effect of a magnetic or electric field on radiation depends upon the nature of the radiation.

13. Effects of magnetic/ electric field
Alpha
Beta
Gamma
Description
Electric charge
Relative atomic mass
Penetration power
Ionising effect
Effects of magnetic/ electric field
Either use information sheets for students to quickly gather the info or run through it on the board / students to complete from watching your demonstration

14. High energy Electromagnetic radiation
Alpha
Beta
Gamma
Description
2 Protons and
2 Neutrons
High energy Electron
High energy Electromagnetic radiation
Electric charge 2+ -1
Relative atomic mass 4
1/1860 or
negligible
Penetration power
Stopped by paper or few cm’s of air
Stopped by few mm’s of Aluminium
Stopped by cm’s of lead or metres of concreate
Ionising effect
Strongly Ionizing
Weakly Ionizing
Very Weakly Ionizing
Effects of magnetic/ electric field
Weakly deflected
Strongly deflected
No deflection
Either use information sheets for students to quickly gather the info or run through it on the board / students to complete from watching your demonstration

15. Securing activity – complete the GCSE Question

16. Self Marking