Explain how the half-life of a short lived radioactive source can be obtained by use of a Geiger-Muller tube. 

Explain how the half-life of a short lived radioactive source can be obtained by use of a Geiger-Muller tube.

• Switch on the GM-tube, note and record the background count rate, A.
• Place a source of ionizing radiation near the GM-window.
• Note and record the count rate recorded the count rate at equal intervals.
• For each count rate recorded subtract the background count rate to get the true rate.
• Plot a graph of the count rate against time.

Find time t₁ taken for the activity to reduce to A/2 and t₂ taken for activity to reduce to A/4 from A/2

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