Lesson 3 Radioactive Dodgeball
Learning Outcomes <ul><li>You will be successful if you can: </li></ul><ul><li>Describe  the properties of alpha, beta and...
Radioactivity If a substance is capable of ALWAYS emitting radiation under any conditions we say it is ____________.  Ther...
Dangers of radioactivity OUTSIDE the body    and    are more dangerous as    radiation is blocked by the skin. INSIDE t...
Types of radiation 1)  Alpha (  ) – an atom decays into a new atom and emits an alpha particle (2 protons and 2 neutrons ...
ALARA <ul><li>A s  L ow  A s  R easonably  A chievable </li></ul><ul><li>If something  must be done or used , then the ris...
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L3

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L3

  1. 1. Lesson 3 Radioactive Dodgeball
  2. 2. Learning Outcomes <ul><li>You will be successful if you can: </li></ul><ul><li>Describe the properties of alpha, beta and gamma radiation. </li></ul><ul><li>Give uses of radiation in medicine </li></ul><ul><li>Describe how radiation dose is calculated </li></ul><ul><li>Link ideas of risk to the use of radiation </li></ul>
  3. 3. Radioactivity If a substance is capable of ALWAYS emitting radiation under any conditions we say it is ____________. There are three types of radiation: ALPHA, _____ and GAMMA. These types of radiation are always given off by rocks, _____, building materials, air and cosmic rays around us – this is called BACKGROUND RADIATION. Each type is capable of penetrating different materials: Sheet of paper Few mm of _________ Few cm of lead Words – aluminium, beta, food, radioactive   
  4. 4. Dangers of radioactivity OUTSIDE the body  and  are more dangerous as  radiation is blocked by the skin. INSIDE the body an  source causes the most damage because it is the most ionising. Radiation will ionise atoms in living cells – this can damage them and cause cancer or leukaemia. Alpha Beta Gamma
  5. 5. Types of radiation 1) Alpha (  ) – an atom decays into a new atom and emits an alpha particle (2 protons and 2 neutrons – the nucleus of a helium atom) 2) Beta (  ) – an atom decays into a new atom by changing a neutron into a proton and electron. The fast moving, high energy electron is called a beta particle. 3) Gamma – after  or  decay surplus energy is sometimes emitted. This is called gamma radiation and has a very high frequency with short wavelength. The atom is not changed. Unstable nucleus Unstable nucleus Unstable nucleus New nucleus New nucleus Alpha particle Beta particle Gamma radiation New nucleus
  6. 6. ALARA <ul><li>A s L ow A s R easonably A chievable </li></ul><ul><li>If something must be done or used , then the risks must be controlled and as low as possible – enforced by Law </li></ul>

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