1. (a) “Alpha particle” means a positively charged atomic particle consisting of 2 neutrons and 2 protons.
2. (b) “Analytical gross alpha” means total gross alpha activity as measured by the EPA approved methodologies specified in 40 CFR 141.25, and includes but is not limited to alpha particles from radium-226, uranium, thorium, and polonium, and excludes radon.
3. (c) “Compliance gross alpha” means the analytical gross alpha activity minus the uranium activity.
4. (d) “Radionuclides” means alpha particles, beta particles, or both.

Source. #9700, eff 5-1-10; ss by #12668, eff 1-1-19; ss by #12819, eff 6-28-19