Four working level measurement methods have been evaluated and optimized from the inherent and statistical error standpoint. Optimization with respect to various sampling and measurement yielded no marked improvement over the existing methods. However, when appropiate approximations are made and evaluated exactly, the two measurement methods can be reduced to simple formulas eliminating a need to use nomograms. These modified methods also have improved inherent error characteristics. A new method-a combination of two existing methods-with improved inherent and statistical error has been suggested.
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