Section 327IAC8-2-10. Beta and photon radioactivity from manmade radionuclides; maximum contaminant levels

   (a) The average annual concentration of beta particle and photon radioactivity from manmade radionuclides in drinking water shall not produce an annual dose equivalent to the total body or any internal organ greater than four (4) millirem per year.

  (b) Except for the radionuclides listed in the following table, the concentration of manmade radionuclides causing four (4) millirem total body or organ dose equivalent shall be calculated on the basis of a two (2) liter per day drinking water intake using the one hundred sixty-eight (168) hour data listed in "Maximum Permissible Body Burdens and Maximum Permissible Concentration of Radionuclides in Air or Water for Occupational Exposure," NBS Handbook 69 as amended August 1963, U.S. Department of Commerce. If two (2) or more radionuclides are present, the sum of their annual dose equivalent to the total body or to any organ shall not exceed four (4) millirem per year.

Average annual concentrations assumed to produce a total body organ dose of four (4) millirem per year
Radionuclide	Critical Organ	pCi per liter
Tritium	Total body	20,000
Strontium-90	Bone marrow	8

  (c) The sampling frequency for the contaminants listed in subsections (a) through (b) shall be pursuant to section 10.2 of this rule. (Water Pollution Control Division; 327 IAC 8-2-10; filed Sep 24, 1987, 3:00 p.m.: 11 IR 708; filed Dec 28, 1990, 5:10 p.m.: 14 IR 1027; errata filed Aug 6, 1991, 3:45 p.m.: 14 IR 2258)