Uses of Radiation
AQA seperate scienced Physics : 2B - Atoms and electricity
Mindmap covering
- Smoke detectors
- Tracers
- Radiography
- Sterillisation
- Created by: Ellie
- Created on: 17-04-14 12:59
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- Uses of Radiation
- Smoke Detectors
- Use Alpha Radiation
- a weak amount of alpha radiation is placed by two electrodes in a smoke alarm
- This causes ionisation so a current flows between the electrodes
- When there is a fire the smoke will absorb the radiation - so the current stops and the alarm sounds.
- This causes ionisation so a current flows between the electrodes
- Tracers in Medicine
- Always beta or gamma
- Certain radioactive isotopes can be injected into people and their progress is then recorded as the radiation flows around the body
- Tracers have to be Gamma or Beta so that they leave the body and don't get absorbed by body tissues
- Radiotherapy
- Gamma Rays
- Used to kill living cells
- Used to treat cancer
- Some cells are damaged in the process
- Gamma Rays
- Sterilisation of food and medical equipment
- Food is exposed to Gamma radiation to kill microbes
- Food isnt radioactive afterwards so is perfectly safe to eat
- needs gamma rays with long half lives
- Food is exposed to Gamma radiation to kill microbes
- Smoke Detectors
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