How often does EPA sample precipitation?
• EPA scientists routinely test precipitation samples from more than 30 sites in the U.S. The stations submit precipitation samples to the EPA lab as rainfall, snow or sleet occurs. Under routine circumstances, samples are analyzed by EPA scientists monthly. EPA performs gamma analysis on each sample, followed by the routine analyses. Routine analysis of precipitation for gamma emissions takes about a week from the time the lab receives the sample. This is to ensure the proper analysis and quality assurance (QA) takes place before the results are released. The tests for specific radioactive material may take longer. EPA’s RadNet radiation air monitors across the U.S. continues to show typical fluctuations in background radiation levels. The levels detected are far below levels of concern.
