United States Nuclear Regulatory Commission - Protecting People and the Environment

Resolution of Generic Safety Issues: NUREG-0933: Footnote 1968 ( NUREG-0933, Main Report with Supplements 1–35 )

1968.Regulatory Guide 1.21, "Measuring, Evaluating, and Reporting Radioactive Material in Liquid and Gaseous Effluents and Solid Waste," U.S. Nuclear Regulatory Commission, Washington, DC, December 1971, (Rev. 1) June 1974, (Rev. 2) June 2009.