A Comparison of LabSOCS and Source-Based Full Energy Efficiency Generation in Measurements.

Not all gamma rays emitted by the source that pass through the detector will produce a count in the system.The probability that an emitted gamma ray will interact with the detector and produce a count is the efficiency of the detector.Efficiency is measured by comparing a spectrum from a source of known activity to the count rates in each peak to the count rates expected from the known intensities of each gamma ray and is an important factor in measurement of activity concentration in variety of sample types. The energy of the gamma rays being detected is an important factor in the efficiency of the detector. An efficiency curve can be obtained by plotting the efficiency at various energies. This curve can then be used to determine the efficiency of the detector at energies different from those used to obtain the curve. A comparison of two gamma-ray efficiency determination methods; Canberra?s LabSOCS and the source-based efficiency calibrations usingmarinelli beaker geometry were measured and the results revealed +96% confidence levels for each gamma peak lines. This means that the Canberra?s LabSOCS will be used for efficiency curve generation and no more dependence on standard sources in activity concentration measurements for variety of sample matrices.