Alpha beta and gamma.

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LOJ Feb 2004 Radioactivity 2 Ionizing Power and Penetrating Power.

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Alpha beta and gamma

What is radioactive decay? Teacher notes This activity, summarising the three types of radiation, could be used to introduce the topic of radiation, as a plenary exercise or as a revision exercise.

What is alpha (α) radiation? Description 2 neutrons, 2 protons Note:– An alpha particle is the same as a helium nucleus Electric charge +2 Relative atomic mass 4 Penetrating power Stopped by paper or a few centimetres of air Ionizing effect Strongly ionizing Effect of magnetic/ electric field Weakly deflected

What is beta (β) radiation? Description High energy electron Electric charge -1 Relative atomic mass 1/1860 Penetrating power Stopped by a few millimetres of aluminium Ionizing effect Weakly ionizing Effect of magnetic/ electric field Strongly deflected

Gamma () radiation Description High energy electromagnetic radiation Electric charge Relative atomic mass Penetrating power Stopped by several centimetres of lead or several metres of concrete Ionizing effect Very weakly ionizing Effect of magnetic/ electric field Not deflected

Types of radiation and penetrating power Teacher notes This matching activity could be used as a plenary exercise on the penetrating power of radiation. Students could be asked to complete the activity in their books or on mini-whiteboards. The activity could be concluded by completion on the IWB.