Radioactive decay, half-life and uses

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Question 73
Easy

In a steel rolling mill, a gamma radiation source and a detector are used to monitor the thickness of a moving steel sheet as shown in the diagram.

Diagram showing a steel sheet thickness control system using a gamma radiation source.

When the steel sheet is at the correct target thickness, the measured count rate is 240 counts per second.

During a production run, the count rate decreases.

Give one reason for this decrease.

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Radioactive decay, half-life and uses Questions

  1. GCSE
  2. /Physics
  3. /Radioactive decay, half-life and uses