We've made some changes to EPA.gov. If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

To contact the EPA for questions about radiation risk assessment and/or this calculator, please Contact Us.

page title goes here Risk Assessment

A new Peak PRG output option has been added. Please see the What's New page for details.

PRG Download Area

Unavailable until further notice.