Frequent Questions

How does EPA sample precipitation?

More than 25 stations across the U.S. collect precipitation samples such as rain, snow or sleet. Under routine circumstances, EPA scientists test the samples on a monthly basis. EPA performs gamma analysis on each sample. Routine analysis of precipitation for gamma emissions takes about a week from the time the lab receives the sample. The results are checked to assure that they meet quality assurance criteria and are posted periodically to the RadNet Envirofacts database.

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