1. IONISING RADIATION UNDERSTANDING THE NATURE OF IONISING RADIATION

3. Starter Activity 1. What is Radiation? 2. What is background radiation? Radiation is all around us. True or False?

4. What is Radiation? Radiation is energy. It travels through space in the form of particles or waves. Radiation is everywhere. It is in the air we breathe, the water we drink, and the food we eat. This makes up the "background radiation" that we are all exposed to everyday. IONISING RADIATION The energy released from radioactive atoms is ionising radiation.

8. RADIATION TYPES Unstable atoms emit (give radiation) from their NUCLEI. An unstable nucleus can emit alpha, beta and gamma radiation. Note the properties of the three types of radiation shown below NOTE

9. QUICK RECAP Which one of the three types of radiation is: 1.The hardest to stop. 2.The easiest to stop. 3. Explain why different types of radiation are absorbed by different amounts in different material ALPHA BETA GAMMA

10. Penetrating Power of Radiation Complete the table to summarise the properties of alpha, beta and gamma radiation. property alpha beta gamma ionising power range in air stopped by Electromagnetic radiation?

11. RADIOACTIVE DECAY Radioactive decay is the process in which an unstable atomic nucleus spontaneously loses energy by emitting ionizing particles and radiation. This decay, or loss of energy, results in an atom of one type, called the parent nuclide transforming to an atom of a different type, named the daughter nuclide. NOTE FACT

12. RADIOACTIVE DECAY Radioactive elements have unstable nuclei, meaning they are transformed into other elements. When an unstable atom emits radiation it undergoes radioactive decay and becomes more stable. NOTE

13. TYPES OF DECAY Alpha decay: Participating particle is alpha (A=4, Z=2) emitted from the nucleus. It’s important you learn to work this out Beta negative decay (A=0, Z=1) and the daughter nucleus is (A, Z+1) Beta positive decay (A=0, Z=1) and the daughter nucleus is (A, Z-1) NOTE NOTE NOTE

16. Effect of Radiation on living Organisms Effect of Radiation on living Organisms

17. Because of the hazards, you are not allowed to use radioactive sources yourself. Discuss the risks associated with use of ionizing radiation? Your TASK

19. Types or Products of Ionizing Radiation    or X-ray  neutron