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[en] For the software UncertRadio (UR), designed for a generalized evaluation of environmental radioactivity measurements, the evaluation procedure is given if least squares-fitting is involved. UR is then applied to the simultaneous detection of Strontium-89 and Strontium-90. This method is easily extendable over recent approaches based on the evaluation of two measurements, i.e. on two unknowns with two equations. The evaluation within UR includes ISO 11929 decision thresholds and detection limits. The propagation of distributions with MC simulation is described. - Highlights: • Weighted least squares based on Neyman- or Pearson-type Chi-square criterion. • Weighted total least squares included for significant input quantities covariances. • Requires a 6-step procedure for constructing a matrix-based uncertainty function. • ISO 11929 characteristic values are derived from the uncertainty function.