Uses Of Radiation Flashcards
1
Q
How do smoke detectors work?
A
A weak source of alpha radiation is placed in the detector, close to two electrodes.
The source causes ionisation and a current flows
If there is a fire, the smoke will absorb the radiation, stopping the current and the alarm sounds
2
Q
How do we trace medicines?
A
Certain radioactive isotopes can be injected, and an external detector can follow the medicine going round the body.
3
Q
Why are medicines that contain radioactive material always have to be gamma or beta?
A
Because the radiation can get out of the body.
4
Q
When we inject beta radiation as a medicine, how long does its half life need to be?
A
Very short
5
Q
What type of radiation do we need for the treatment of cancer?
A
Gamma
6
Q
How do we steralise surgical instruments?
A
Using gamma rays
