Skip to main content

The NRC is modernizing nrc.gov with an updated design and improved navigation to enhance usability. We are committed to a smooth transition and will work to minimize any disruption. The site may be briefly unavailable at times during launch. Thank you for your patience.

Implementation Guidance for 10 CFR Part 37, "Physical Protection of Category 1 and Category 2 Quantities of Radioactive Material" (NUREG-2155)

Description Date
Initial Report February 2013
Revision 1 January 2015
Revision 2, Final March 2022

Page Last Reviewed/Updated Thursday, January 30, 2025

Page Last Reviewed/Updated Thursday, January 30, 2025