Types of Radiation. Starter: On your Post it, Answer the following questions and stick it on the board What do you think ‘Radiation’ is? What do you think ‘Radiation’ is? Name a type of radiation and put it on a scale of 1 (Minor problems)  10 ( Death) for how dangerous you think it is? Name a type of radiation and put it on a scale of 1 (Minor problems)  10 ( Death) for how dangerous you think it is? 1 (Might hurt a Fly.) 10 (Would certainly kill a Fly.)

Lesson Objectives (F) State and recognise the three main types of nuclear radiation. (F) State and recognise the three main types of nuclear radiation. (F/H) Describe the penetrating powers of the three types of radiation and their effects. (F/H) Describe the penetrating powers of the three types of radiation and their effects. (H) Explain ionisation in terms of removal and gain of electrons by particles. (H) Explain ionisation in terms of removal and gain of electrons by particles.

Types of Radiation. Name:AlphaBetaGamma Symbol: What is it. Charge. Atomic mass Speed Penetration power. Ionising power.

Alpha ( α )  Alpha particles are emitted from the nucleus of large atoms.  They are made up of 2 protons and 2 neutrons (Which means it is the same as a Helium nucleus with an atomic mass of 4).  They move at relatively slow speeds compared to other animations because of their size.  What do you think happens to the nucleus after the alpha particle leaves?

Beta ( β )  Beta particles are also emitted from the nucleus of atoms.  They are a single electron leaving the nucleus.  They move at quite fast compared to Alpha particles  What do you think happens to the nucleus after the beta particle leaves? Problem?

Gamma ( γ )  Gamma radiation is a Electromagnetic wave released from the nucleus.  As a Electromagnetic wave they move at? The speed of light.  What do you think happens to the nucleus after the Gamma radiation leaves?

Types of Radiation. Name:AlphaBetaGamma Symbol:αβγ What is it Charge. Atomic mass Speed Helium Nucleus (2p + 2n) High energy electron High energy Electromagnetic Wave 2 positive. 1 Negative. None. 4. Almost nothing. Almost nothing. No mass Relatively Slow. Fast. Fast. Speed of light

Thin mica Thin aluminium stops BETA Thick lead reduces GAMMA Skin or paper stops ALPHA The penetration power   

Types of Radiation. Name:AlphaBetaGamma Symbol:αβγ What is it Helium Nucleus (2p + 2n) High energy electron High energy Electromagnetic Wave Charge. 2 positive. 1 Negative. None. Atomic mass 4. Almost nothing. Almost nothing. No mass Speed Relatively Slow Quite Fast Speed of light. Penetration power. Ionising power. Stopped by paper or skin. Stopped by a few mm of aluminium Reduced by a few inches of Lead.

Ionisation? Ionisation occurs when electrons are removed from an atom. A charged particles will cause more ionisation than neutral ones. A charged particles will cause more ionisation than neutral ones. A Large particle is more likely to collide with electrons on atoms. A Large particle is more likely to collide with electrons on atoms. So with this information, Rank the Ionisation ability of the radiation types. Highest to lowest. So with this information, Rank the Ionisation ability of the radiation types. Highest to lowest.

Types of Radiation. Name:AlphaBetaGamma Symbol:αβγ What is it Helium Nucleus (2p + 2n) High energy electron High energy Electromagnetic Wave Charge. 2 positive. 1 Negative. None. Atomic mass 4. Almost nothing. Almost nothing. No mass Speed Relatively Slow Quite Fast Speed of light. Penetration power. Ionising power. Stopped by paper or skin. Stopped by a few mm of aluminium Reduced by a few inches of Lead. HighMediumLow

Summary (re: post it.). Using the different colours of Post-it notes. Using the different colours of Post-it notes. Alpha = Pink post-it. Beta = Yellow post-it. Gamma = Orange post-it. Post one for each type on the scale of 1-10, with a reason why you placed it where you did. Post one for each type on the scale of 1-10, with a reason why you placed it where you did. Don’t give in to peer pressure. Don’t give in to peer pressure. 1 (Might hurt a Fly.) 10 (Would certainly kill a Fly.)