Contamination and Irradiation – ppt download

Presentation on theme: “Contamination and Irradiation”— Presentation transcript:

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Contamination and Irradiation

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Engager: Complete the thorium decay chain!
Students through cloud radioactivity.. Anything and everything they know.

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To define the difference between contamination and Irradiation
Progress To distinguish the differences between contamination and Irradiation. Explain how contamination can be prevented Explain what Irradiation is.

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To demonstrate good progress in this lesson
Name Will… distinguish the differences between contamination and Irradiation Explain how contamination can be prevented explain what Irradiation is. The Honley Learning Mindset Advocate for this lesson is… Matthew – will show resilience by not giving up if he finds something difficult.

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minimise • tongs • shielded • protective • labelling • notified
Connector What are the different ways in which radioactive sources should be handled Use __________ clothing. Use _____ to handle sources thus keeping your distance. ________ exposure time. Store sources in ________ containers with clear _________. The fire service should be ________ of where sources are stored. minimise • tongs • shielded • protective • labelling • notified If you do all of those you will end up like this Students copy and complete or print and fill gaps Mention the protection used in situations where ionising radiation is used in the real world (dentists, hospitals etc) and the protections they use

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[ ] + Connector Irradiation vs Radioactive
Lots of people are scared of radiation. When they hear that is used on may things that they eat. Ionising radiation Ionises atoms (gives them a charge) by ’knocking’ electrons free. [ ] + Key info on what ionising radiation actually does Ionising radiation A charged particle (ion) is left behind!

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Irradiation vs Radioactive
Radioactive means that it actually contains a substance that has radioactive (decaying) particles in it. If this is unintentional it is known as radioactive contamination. If something is exposed to ionising radiation it doesn’t become radioactive and dangerous; it is said to be irradiated. Much of our food is irradiated to kill bacteria and make it safer and to make it keep longer One reason why it is useful and the difference between the two words and usage You may see this symbol on irradiated foods

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How dangerous is nuclear radiation?
It depends on: The type How active the source is How far you are from it If it’s inside you… Get some ideas from students. Operative word: Was Alexander Litvinyenko… Russian spy Who was this?

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How dangerous is nuclear radiation?
Alpha radiation is deadly if it gets inside you. This is Alexander Litvinenko. He was killed when he ingested a source of alpha radiation (Polonium-210) in a spiked cup of tea. 2006 for when the kids ask.. Like something out of a james bond movie. It was concluded that he was assasinated by the FSB (russian secret servise) on orders from Vladimir Putin.

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Dangers of radioactivity
Radiation will ionise atoms in living cells – this can damage them and cause cancer or leukaemia. Alpha Beta Gamma 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.

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What did happen Litvinenko?
This is a 20 minute video into the death of Alexandra Litvinenko. Complete GCSE whilst watching. Securing activity – complete the GCSE Question

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Self Marking

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Homework Due in next week