Validation testing of the Genie 2000 Cascade Summing Correction

To validate the accuracy and precision of the Cascade Summing Correction method, over 800 archived measurements of calibrated sources (filter paper, 20 cm3 liquid scintillation vial, 400 ml beaker and Marinelli beaker) containing cascading (88Y and 60Co) and non-cascading isotopes from 133 different ISOCS/LabSOCS characterized high purity germanium detectors have been analyzed. Comparing the corrected results for the cascading isotope activities to the known activities shows the method is effective and accurate. Evaluation of the accuracy as a function of the amount of correction reveals a small systematic error for which a variable precision adjustment is recommended. Requirements to filter true coincidence X-rays by are verified. (author)