Analytical methods for radionuclides

Analytical methods for radionuclides. (1) Analytical methods. Analyses conducted to determine compliance with ss. NR 809.50 and 809.51 shall be made in accordance with approved methods listed in Table N. (2) Detection limits. To determine compliance with s. NR 809.50 (1) , the detection limit may not exceed the concentrations in Table O. (3) Results rounding. To judge compliance with the maximum contaminant levels listed in s. NR 809.50 , averages of data shall be used and shall be rounded to the same number of significant figures as the maximum contaminant level for the substance in question. (4) Sensitivity limits. For the purpose of monitoring radionuclide concentrations in drinking water, the required sensitivity of the radioanalysis is defined in terms of a detection limit. The detection limit shall be that concentration which can be counted with a precision of plus or minus 100% at the 95% confidence level, 1.96 ó where ó is the standard deviation of the net counting rate of the sample. (5) Detection limits for man-made beta particle and photon emitters. To determine compliance with s. NR 809.51 , the detection limits may not exceed the concentrations listed in Table P. (6) Sample collection methods. Sample collection for radionuclide contaminants under s. NR 809.50 shall be conducted using the sample preservation, containers and maximum holding time procedures specified in Table Q. If a composite sample is prepared, a holding time cannot exceed 12 months. In all cases, samples should be analyzed as soon after collection as possible.