An official website of the United States government.

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.

Radiation Protection

Contact Us

Federal Guidance Report No. 12: External Exposure to Radionuclides in Air, Water, and Soil

This document provides exposure-to-dose coefficients for general application based on the 1987 Federal Radiation Protection Guidance.

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.

Federal Guidance Report No. 12: External Exposure to Radionuclides in Air, Water, and Soil (PDF)(238 pp, 3 MB, September 1993, 402-R-93-081)