Abstract
The precision and speed of Ashworth's rapid lifetime determination method (RLD) for a single exponential decay is evaluated. The RLD is compared to the weighted linear least-squares (WLLS) method. Results are presented as a function of integration range and signal noise level. For both the lifetime and the preexponential factor, optimum fitting regions exist, yet the errors increase rather slowly on either side of the optimum. The optimum conditions for determination of the preexponential factor and the lifetime are similar, so both can be determined with good precision even at low total counts (10/sup 4/). In the optimum region, the relative standard deviations for the RLD are only 30-40% worse than for WLLS, but the calculations are tens to hundreds of times faster, depending on how the data are taken. The speed and precision of the RLD coupled with the ease of data acquisition make it an attractive data reduction tool for real time analyses.
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