MCLGs for radionuclides are as indicated in the following table: ------------------------------------------------------------------------
Contaminant MCLG------------------------------------------------------------------------1. Combined radium-226 and radium-228........ Zero.2. Gross alpha particle activity (excluding Zero.
radon and uranium).3. Beta particle and photon radioactivity.... Zero.4. Uranium................................... Zero.------------------------------------------------------------------------ [65 FR 76748, Dec. 7, 2000]