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Minimum detectable activity
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What is the least amount of activity measurable?

Given the circumstances of the particular spectrum measurement, the maximum detectable activity is the minimum amount of radioactive nuclide which could have been determined.

  • Examine the peak region in the spectrum and calculate the net peak area, its uncertainty and the uncertainty of the peak background correction.
  • Calculate the critical limit, LC, and compare with the net peak area.
  • If the peak area is greater than the critical limit quote a result with an appropriate confidence limit.
  • If the peak area is not significant then calculate the detection limit, LD, and pass that value through the calculation to produce an eventual detection limit which we can identify with the minimum detectable activity.

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1999, 2000 The University of Liverpool, Department of Physics

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