P2b T6 - using radioactive materials
- Created by: John@11g
- Created on: 03-04-15 13:56
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- Using radiation and half-life
- background radiation and half life
- background radiation
- lowest level radiation that is around us all of the time
- air, food, rocks, buildings
- cosmic rays from space
- protected by the atmosphere and magnetic fields
- half-life
- the half life of a radioactive isotope is the time taken for half of the undecayed nuclei to decay
- a short half-life means the activity falls quickly because lots of nuclei decay quickly
- a long half-life means that the activity falls more slowly because most of the nuclei dont decay for a long time
- background radiation
- uses of radioactivity
- household fire alarms- Alpha
- sterilisation of food and equipment- Gamma
- tracers and thickness gauges- Beta and Gamma
- treatment of cancer- Gamma
- dangers of radioactivity
- ionising radiation
- tissue damage
- cell mutations
- protection from radiation
- don't touch it
- stay as far away as possible
- exposure time short and keep it in a lead box
- ionising radiation
- Nuclear power
- nuclear waste
- lots of radioactive material left
- very long half-lives
- kept in steel containers covered in lead and put deep underground
- need lots of material to absorb the radiation before it reaches the surafce
- lots of radioactive material left
- nuclear waste
- background radiation and half life
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