This document and accompanying video provides actionable guidance, sample text for a radiological dispersal device (RDD) response protocol, and annexed tools that can be used for local planning of an effective response to an RDD to protect first responders and the general public, and establish interagency coordination and integration of state and federal assets.
https://www.dhs.gov/sites/default/files/publications/NUSTL_RDD-ResponsePlanningGuidance-Public_171215-508.pdf