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(i) Argon gas – ionized by the radiation.
Bromine – quenching agent.
(ii)
- When a radioactive substance is placed in front of the window, the emitted radiations enter the tube through the window and ionize the argon gas.
- The negative ions move towards the anode while the positive ions move towards the cathode.
- As ions accelerate, they collide with more particles on their paths, resulting in further ionization (Avalanche of electrons).
- A pulse current flow. A corresponding pulse voltage is registered across the resistor R.
- These currents can be amplified and if passed through a loudspeaker, clicks are heard – or a rate meter.
(iii)
- Used to monitor the function of thyroid gland.
- Used to trace blood clots.
- Used to kill harmful tissues such as cancerous cells.
sharon kalunda answered the question on September 27, 2019 at 10:36
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