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Because of a lapse in government funding, the information on this website may not be up to date, transactions submitted via the website may not be processed, and the agency may not be able to respond to inquiries until appropriations are enacted. The NIH Clinical Center (the research hospital of NIH) is open. For more details about its operating status, please visit cc.nih.gov. Updates regarding government operating status and resumption of normal operations can be found at opm.gov.

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Radiation Safety Guide

​The Radiation Safety Guide is the official reference for those working with ionizing radiation at the National Institutes of Health and serves as a manual for all current policies regarding the use of radioactive materials and ionizing radiation-producing devices at the NIH.  ​