OAR 333-061-0030
Maximum Contaminant Levels and Action Levels
(a)
The average annual concentration of beta particle and photon radioactivity from man-made sources, including all radionuclides emitting beta particles or photons listed in Maximum Permissible Body Burdens and Maximum Permissible Concentration of Radionuclides in Air or Water for Occupational Exposure, National Bureau of Standards Handbook 69, except the daughter products of Thorium-232, Uranium-235 and Uranium-238, shall not produce an annual dose equivalent to the total body or any internal organ greater than 4 millirem per year. If two or more radionuclides are present, the sum total of their annual dose equivalent to the total body or to any organ shall not exceed 4 mrem/year.
Source:
Rule 333-061-0030 — Maximum Contaminant Levels and Action Levels, https://secure.sos.state.or.us/oard/view.action?ruleNumber=333-061-0030
.