Section NR 809.51 - Beta particle and photon radioactivity from man-made radionuclides maximum contaminant levels(1) ALLOWABLE DOSE. The average annual concentration of beta particle and photon radioactivity from man-made radionuclides in drinking water shall not produce an annual dose equivalent to the total body or any internal organ greater than 4 millirem/year.(2) MCL CALCULATION. Except for the radionuclides listed in Table M, the concentration of man-made radionuclides causing 4 mrem total body or organ dose equivalents shall be calculated on the basis of a 2 liter per day drinking water intake using the 168 hour data listed in "Maximum Permissible Body Burdens and Maximum Permissible Concentrations of Radionuclides in Air or Water for Occupational Exposure", NBS Handbook 69 as amended August, 1963, U.S. Department of Commerce. Copies of this document are available for inspection at the office of the department of natural resources and the office of the legislative reference bureau, and may be obtained for personal use from the Superintendent of Documents, U.S. Government Printing Office, Washington, D.C. 20402. If 2 or more radionuclides are present, the sum of their annual dose equivalent to the total body or to any organ may not exceed 4 millirem/year. Table M
Average Annual Concentrations Assumed to Produce a Total Body or Organ Dose of 4 mrem/yr.
Radionuclide | Critical Organ | pCi per liter |
| Tritium | Total body | 20,000 |
| Strontium-90 | Bone marrow | 8 |
Wis. Admin. Code Department of Natural Resources NR 809.51
CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10.Amended by, correction in (2) made under s. 13.92 (4) (b) 6, Stats., Register April 2023 No. 808, eff. 5/1/2023Sections ss. NR 809.50 to 809.52 are identical to the radioactivity standards of the department of health services in ch. DHS 157, Wis. Adm. Code, and to the National Interim Primary Drinking Water Regulations, 40 CFR part 141 . These sections are adopted pursuant to s. 254.34, Stats.