An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to www.epa.gov. This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Radiation Protection

EPA's Role in Radiation Protection

U.S. Environmental Protection Agency signIn 1970, Congress gave EPA the responsibility for establishing generally applicable standards for the protection of human health and the environment from radioactive materials. EPA standards set protective limits on the radioactivityHelpradioactivityThe emission of ionizing radiation released by a source in a given time period. The units used to measure radioactivity are curie (Ci) and becquerel (Bq). in soil, water and air that comes from human use of radioactive elements such as uranium. These radioactive elements emit ionizing radiationHelpionizing radiationRadiation with so much energy it can knock electrons out of atoms. Ionizing radiation can affect the atoms in living things, so it poses a health risk by damaging tissue and DNA in genes., which can damage living tissue and cause cancer. Learn the radiation basics. EPA does not regulate the non-ionizing radiationHelpnon-ionizing radiationRadiation that has enough energy to move atoms or cause them to vibrate, but not enough to remove electrons. Examples of this kind of radiation are radio waves, visible light and microwaves. that is emitted by electrical devices such as cell phones. See: Radiation Resources Outside of EPA.

Related information in Spanish (Información relacionada en español)

In addition to setting legally enforceable standards, EPA issues federal guidance documents with recommendations on radiation protection. EPA develops technical reports to help standardize methods for dose and risk assessment. Federal guidance recommendations and technical reports are used by federal and state agencies in developing radiation protection regulations and standards. EPA also helps state and local responders respond to radiological emergencies.

EPA develops science-based guidance for cleaning up sites that are contaminated with radioactive materials, including Superfund Program sites. The Agency works cooperatively with other federal agencies to ensure that consistent site investigation and laboratory methods are used throughout the federal government.

View EPA Radiation Regulations and Laws
Learn about EPA's Federal Guidance for Radiation Protection