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, L_{C},
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, L_{D}, and pass that value through the calculation
to produce an eventual detection limit which we can identify with the
minimum detectable activity.
