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Radioactivity and radioisotopes

Radioactivity and radioisotopes. Gamma rays absorption Absorption equation. Investigating g -ray absorption. You are going to investigate how the activity detected by a GM tube changes when different thicknesses of lead are placed as a barrier between the g -source and the tube.

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Radioactivity and radioisotopes

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  1. Radioactivity and radioisotopes • Gamma rays absorption • Absorption equation

  2. Investigating g-ray absorption You are going to investigate how the activity detected by a GM tube changes when different thicknesses of lead are placed as a barrier between the g-source and the tube. The limit of activity in the environment where medical staff operate g-rays machinery from is 0.3 Bq. In your investigation you are required to find the minimum thickness of lead coating needed to ensure the appropriate protection for medical staff, i.e. no more than 0.3 Bq in the operating room. Use the apparatus drawn underneath and think of a way to account for background radiation. g-source embedded in lead casing Different thickness lead GM-tube Counter

  3. Investigating g-ray absorption • Here are some hints: • Plot a graph of the natural logarithm of the activity (counts per second) against the thickness of the lead barrier. • Your graph should be a straight line if the absorption follows the equation: • Use your graph to find the value of l and the thickness required for the limit of activity of 0.3 Bq.

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